UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 2025

For the transition period from to

Commission File Number 001-36569

Registrant’s telephone number, including area code: (978) 671-8001

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☑ No ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐ No ☑

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No ☐

Indicate by check mark whether the registrant has submitted every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☑ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☑

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Act) Yes ☐ No ☑

The aggregate market value of the registrant’s common stock held by non-affiliates of the registrant on June 30, 2025 was approximately $4,274.70 million based on the last reported sale price of the registrant’s common stock on the NASDAQ Global Market on June 30, 2025 of $81.86 per share.

As of February 23, 2026 the registrant had 64,605,894 shares of common stock, $0.01 par value, issued and outstanding.

LANTHEUS HOLDINGS, INC.

ANNUAL REPORT ON FORM 10-K

TABLE OF CONTENTS

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Some of the statements contained in this Annual Report on Form 10-K (“Form 10-K”) are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). These forward-looking statements, including, in particular, statements about our plans, strategies, prospects and industry estimates, are subject to risks and uncertainties. These statements identify prospective information and can generally be identified by words such as “anticipates,” “believes,” “can,” “commitment,” “could,” “designed,” “ensuring,” “estimates,” “expects,” “generate,” “impact,” “increasing,” “hopes,” “intends,” “launch,” “likely,” “long-term,” “maintain,” “may,” “pipeline,” “plans,” “potential,” “predict,” “remain,” “seek,” “should,” “sustain,” “target,” “will,” “would” and similar expressions, or by express or implied discussions regarding potential acquisitions, dispositions, collaborations, development and commercialization plans described in this Form 10-K, or regarding potential future revenues and expenses related to such acquisitions, collaborations, development and commercialization plans. Examples of forward-looking statements include statements we make relating to our outlook and expectations including, without limitation, in connection with:

Forward-looking statements are based on our current expectations and assumptions regarding our business, the economy and other future conditions. Because forward-looking statements relate to the future, such statements are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Our actual results may differ materially from those contemplated by the forward-looking statements. These statements are neither statements of historical fact nor guarantees or assurances of future performance. The matters referred to in the forward-looking statements contained in this Form 10-K may not in fact occur. We caution you, therefore, against relying on any of these forward-looking statements. These forward-looking

statements are subject to a number of risks, uncertainties and assumptions, including those described in Part I, Item 1A, "Risk Factors" of this Form 10-K.

Any forward-looking statement made by us in this Form 10-K speaks only as of the date on which it is made. Factors or events that could cause our actual results to differ may emerge from time to time, and it is not possible for us to predict all of them. We undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by law.

SUMMARY OF MATERIAL RISKS ASSOCIATED WITH OUR BUSINESS

Our business is subject to a number of risks, including risks that may adversely affect our business, results of operations, cash flows, and prospects. These risks are discussed more fully below and include, but are not limited to:

Risks Related to Our Portfolio of Commercial Products

Risks Related to Reimbursement and Regulation

Risks Related to Our Business Operations and Financial Results

Risks Related to Our and Our Strategic Partners’ Portfolios of Clinical Development Candidates

Risks Related to Our Capital Structure

NOTE REGARDING COMPANY REFERENCES

Unless the context otherwise requires, references to the “Company,” “our Company,” “Lantheus,” “we,” “us” and “our” refer to Lantheus Holdings, Inc. and its direct and indirect wholly-owned subsidiaries; references to “Lantheus Holdings” refer to Lantheus Holdings, Inc. and not to any of its subsidiaries; references to “Lantheus Medical” refer to Lantheus Medical Imaging, Inc., the wholly-owned subsidiary of Lantheus Holdings; references to “Aphelion,” “Lantheus Alpha” and “Meilleur” refer to Aphelion LLC, Lantheus Alpha Therapy, LLC and Meilleur Technologies, Inc., respectively, each a wholly-owned subsidiary of Lantheus Holdings; references to “Cerveau,” “Lantheus Real Estate,” “Progenics,” “Evergreen,” “Lantheus Radiopharm UK”, and “Lantheus Switzerland,” refer to Cerveau Technologies, Inc.; Lantheus MI Real Estate, LLC; Progenics Pharmaceuticals, Inc.; Evergreen Theragnostics, Inc.; Lantheus Radiopharmaceuticals UK Limited and Lantheus Switzerland GmbH, respectively, each a wholly-owned subsidiary of Lantheus Medical, references to “EXINI” refer to EXINI Diagnostics AB, a wholly-owned subsidiary of Progenics, and references to “Life Molecular” refer to Life Molecular Imaging Limited (now renamed as Lantheus Biosciences Ltd.), a wholly-owned subsidiary of Lantheus Radiopharm UK.

NOTE REGARDING TRADEMARKS

We own or have the rights to various trademarks, service marks and trade names, including, among others, the following: PYLARIFY®, DEFINITY®, Neuraceq® and Find Fight and Follow® referred to in this Form 10-K. Solely for convenience, we refer to trademarks and service marks in this Form 10-K without the TM, SM and ® symbols. Those references are not intended to indicate, in any way, that we will not assert, to the fullest extent permitted under applicable law, our rights to our trademarks and service marks. Each trademark, trade name or service mark of any other company appearing in this Form 10-K is, to our knowledge, owned by that other company.

PART I

Item 1. Business

Overview

We are the leading radiopharmaceutical-focused company committed to enabling clinicians to Find, Fight and Follow disease to deliver better patient outcomes. We classify our products into three product categories: Radiopharmaceutical Oncology, Precision Diagnostics, and Strategic Partnerships and Other Revenue. Our Radiopharmaceutical Oncology product helps healthcare professionals (“HCPs”) Find, Fight and Follow cancer. Our Precision Diagnostic products assist HCPs to Find and Follow diseases. Our Strategic Partnerships include biomarkers and digital solutions in support of our partners’ therapeutic development, out-licensing agreements for non-core assets and optimization of our assets geographically, and contract development and manufacturing organization (“CDMO”) revenue generated by Evergreen.

Our commercial products are used by cardiologists, internal medicine physicians, neurologists, nuclear medicine physicians, oncologists, radiologists, sonographers, technologists, and urologists working in a variety of clinical settings. We believe that our diagnostic products provide information that enables HCPs to better detect and characterize, or rule out, disease, with the potential to achieve better patient outcomes, reduce patient risk, and limit overall costs.

We produce and market our products throughout the United States (the “United States” or the “U.S.”), selling primarily to hospitals, independent imaging centers and government facilities. We generally sell our products outside the United States through a combination of direct distribution and third-party distribution relationships in Europe, Canada, Australia, Asia-Pacific, Central America and South America and by licensing exclusive rights to develop and commercialize certain products outside the United States.

We are headquartered in Massachusetts, with offices in New Jersey, Canada, Germany, Switzerland, Sweden and the United Kingdom.

Leadership Transition Plan

Effective November 7, 2025, Mary Anne Heino, the Chair of our Board of Directors (the “Board”), was appointed to serve as our Executive Chair and principal executive officer. Additionally, on January 1, 2026 (the “Effective Date”) Ms. Heino became our Chief Executive Officer (“CEO”), following the retirement of our former CEO, Brian Markison, on December 31, 2025. Ms. Heino will serve as CEO until such time as the Board completes the comprehensive search process that it initiated to identify and appoint the Company’s next CEO. Mr. Markison has agreed to serve as a strategic advisor to the Company through at least March 31, 2026.

2025 Transactions

During 2025, we announced multiple strategic transactions, which shape and sharpen our strategic focus within the radiopharmaceutical industry. A brief description of these transactions is summarized below.

Sale of SPECT Business

On January 1, 2026, we completed the sale of our single-photon emission computerized tomography (“SPECT”) business to SHINE Technologies, LLC (“SHINE”), a wholly-owned subsidiary of Illuminated Holdings, Inc., for total consideration of up to $155.0 million, consisting of cash, a convertible installment note, a term note and contingent earnout payments. Under the terms of the definitive agreement, SHINE acquired the assets and liabilities associated with our SPECT business, including its approved products (TechneLite, NEUROLITE, Xenon Xe-133 Gas, and Cardiolite), the portion of the North Billerica, Massachusetts campus that manufactured our SPECT products and the SPECT-related Canadian operations. The transaction allows us to focus on growing our commercial portfolio of innovative positron emission tomography (“PET”) radiodiagnostics and microbubbles, while prioritizing innovative PET radiodiagnostics.

Acquisition of Life Molecular Imaging Limited

On July 21, 2025, we acquired Life Molecular, pursuant to the terms of the Sale and Purchase Agreement with Life Medical Group Limited (“Life Medical”) and Life Healthcare Group Holdings Limited (the “Sale and Purchase Agreement” and, such acquisition, the “LMI Acquisition”). Life Molecular, headquartered in Berlin, Germany, possesses an Alzheimer’s disease radiodiagnostic commercial infrastructure, research and development capabilities, and an established international footprint. The LMI Acquisition included Neuraceq, an Alzheimer’s disease radiodiagnostic. Neuraceq is commercially approved in the United States, Canada, the European Union, the United Kingdom, Switzerland, China, Japan, South Korea, and Taiwan.

As consideration for the LMI Acquisition, we remitted a total upfront payment of $352.9 million in cash, after working capital-related settlements, and could be required to pay up to an additional $400.0 million in potential earn-out and milestone payments.

Previously, on July 3, 2024, we had acquired from Life Molecular the global rights to RM2, its clinical stage, gastrin-releasing peptide receptor (“GRPR”)-targeting agent, including the associated novel, clinical-stage radiotherapeutic and radiodiagnostic pair, previously referred to as 177Lu-DOTA-RM2 and 68Ga-DOTA-RM2 (and which we now refer to as LNTH-2402 and LNTH-2401, respectively), for an upfront payment of $35.0 million plus a $1.0 million payment made prior to the acquisition (the “RM2 Asset Purchase”), pursuant to the Sublicense, Development and Collaboration Agreement, by and between us and Life Molecular, dated as of June 27, 2024 (the “RM2 Sublicense Agreement”).

In connection with the LMI Acquisition, the RM2 Sublicense Agreement was amended to (i) reduce the contingent regulatory and development milestones by €45.0 million; (ii) assign the right to future payments from Life Molecular to its former parent, Life Medical; and (iii) eliminate certain other non-substantive rights contained in the RM2 Sublicense Agreement (the “RM2 Amendment”). We may be required to pay Life Medical additional milestone payments and royalties in connection with the RM2 Asset Purchase.

For more information on the acquisition of the global rights to RM2, see Note 19,“Acquisitions” to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

In February 2026, we renamed Life Molecular to Lantheus Biosciences Ltd.

Acquisition of Evergreen Theragnostics, Inc.

On April 1, 2025, we acquired all the issued and outstanding shares of Evergreen by means of a statutory merger of our subsidiary with and into Evergreen, with Evergreen surviving as our wholly-owned subsidiary (the “Evergreen Merger”), pursuant to the terms of the Agreement and Plan of Merger (the “Evergreen Merger Agreement”) with Evergreen and Shareholder Representative Services LLC. Evergreen is a clinical-stage radiopharmaceutical company engaged in CDMO services as well as drug discovery and commercialization of proprietary products.

As consideration for the Evergreen Merger, we made an upfront payment of $276.4 million in cash. In the event of achievement of specified milestones, we would be required to pay up to an additional $727.5 million in cash, which may be adjusted pursuant to the terms of the Evergreen Merger Agreement.

For more information, see Note 19, “Acquisitions” to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Annual Report on Form 10-K (“Form 10-K”).

Other Notable Transactions

Prior to 2025, we executed on some additional transactions that are notable to our business, including the following:

Acquisition of NAV-4694

On June 18, 2024, we acquired Meilleur, including its asset NAV-4694, an investigational late-stage F-18-labeled PET imaging agent that targets beta amyloids in Alzheimer’s disease. Under the terms of the agreement, we paid the stockholders of Meilleur (“Meilleur Stockholders”) an upfront payment of $32.9 million and an additional $10.0 million payment in August 2024 after the successful completion of a technology transfer. We could pay additional milestone payments upon achievement of specified U.S. regulatory milestones related to NAV-4694. We could also pay double-digit milestone payments upon achievement of specified annual commercial sales and double-digit royalty payments for research revenue and commercial sales. Research revenue is derived from partnerships with pharmaceutical companies and academic institutions that use NAV-4694 in clinical trials. In May 2025, we paid AstraZeneca AB (“AstraZeneca”), a $10.0 million one-time, non-refundable upfront payment to reduce the future royalty obligations owed to AstraZeneca, pursuant to a license agreement between AstraZeneca and Meilleur related to NAV-4694.

For more information, see Note 19, “Acquisitions” to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Radiopharm Theranostics Limited

On June 15, 2024, we entered into an agreement with Radiopharm Theranostics Limited (“Radiopharm”) to acquire all of Radiopharm’s rights to two licensed preclinical assets for an upfront payment of $2.0 million (the “Radiopharm Asset Purchase”). We acquired global, exclusive rights to both a leucine-rich repeat-containing protein 15 (“LRRC15”)-targeted radiotherapeutic, which we refer to as LNTH-2403, and a Trophoblast cell surface antigen-2 (“TROP2”)-targeted radiodiagnostic, which we refer to as LNTH-2404, each of which is a preclinical therapeutic candidate. LNTH-2403 is our pre-clinical therapeutic targeting LRRC15, which is strongly expressed in multiple malignancies, including head and neck, breast, lung, and pancreatic cancers.

In connection with this acquisition, we assumed the underlying license agreements related to the two preclinical assets, together with their respective milestone and royalty payment obligations.

During the third quarter of 2024, we purchased 149,625,180 shares of Radiopharm common stock (“Radiopharm Shares”), for an aggregate purchase price of approximately $5.0 million. During 2025, we purchased an aggregate additional 388,333,333 Radiopharm Shares for an aggregate purchase price of approximately $10.0 million.

For more information, see Note 19, “Acquisitions” and Note 4, “Fair Value of Financial Instruments” to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Strategic Agreements with Perspective Therapeutics, Inc.

On January 8, 2024, we entered into multiple strategic agreements with Perspective Therapeutics, Inc. (“Perspective”), a radiopharmaceutical company that is pursuing advanced treatment applications for cancers throughout the body. Under the agreements, we obtained an option to exclusively license Perspective’s Pb212-VMT-α-NET, a clinical stage alpha therapy in development for the treatment of neuroendocrine tumors, and an option to co-develop certain early-stage therapeutic candidates targeting prostate cancer using Perspective’s innovative platform technology for an aggregate upfront payment of $28.0 million in cash.

On March 1, 2024, we transferred the fixed assets and associated lease of our Somerset, New Jersey facility to Perspective, and the parties entered into a transition services arrangement pursuant to which we provided to Perspective certain services relating to final disposal of radioactive waste and certain other related services.

During 2024, we also purchased an aggregate of 11,677,339 shares of Perspective’s common stock, after giving effect to a 1-for-10 reverse stock split, for $57.4 million.

For more information, see Note 19, “Acquisitions” and Note 4, “Fair Value of Financial Instruments” to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Exclusive License for PNT2003

On December 20, 2022, we announced the closing of a set of strategic collaborations with POINT Biopharma Global Inc. (“POINT”), in which we were granted a license to exclusive worldwide rights (excluding Japan, South Korea, China (including Hong Kong, Macau and Taiwan), Singapore, and Indonesia) to co-develop and commercialize, POINT’s PNT2003 product candidate. PNT2003 is a somatostatin receptor (“SSTR”) therapy with non-carrier added lutetium-177, which is in registration to treat patients with SSTR-positive neuroendocrine tumors.

On December 27, 2023, Lilly announced the completion of its acquisition of POINT. The acquisition did not impact the status of the license agreements related to the work being performed in connection with our license agreements and our collaboration with POINT.

POINT is responsible for curating all data, analysis and other information necessary for regulatory approval, and supporting us in the preparation of regulatory filings for PNT2003. We are responsible for preparing for and seeking regulatory approval of all such applications, as well as performing and funding all future development and commercialization following such approval. POINT will be responsible for all manufacturing of PNT2003, subject to certain exceptions described in the license and collaboration agreement between our subsidiary, Lantheus Three and POINT, dated November 11, 2022 (the “PNT2003 License Agreement”).

On January 11, 2024, we announced that our Abbreviated New Drug Application (“ANDA”) for PNT2003 had been accepted for filing by the U.S. Food and Drug Administration (“FDA”). On January 26, 2024, we were sued in the District Court for the District of Delaware by Advanced Accelerator Applications USA, Inc. and Advanced Accelerator Applications SA, each a Novartis entity, for patent infringement in response to our ANDA filing and Paragraph IV certification, consistent with the process established by the Hatch-Waxman Act. In December 2025, the court conducted its trial. As of the date of this Form 10-K, we are currently waiting for the court to issue its decision. Under the terms of the Hatch-Waxman Act, full FDA approval of our ANDA filing could be subject to a stay of up to 30 months. If our filing is stayed for the full 30-month period and we are successful in obtaining FDA approval, we could launch PNT2003 in 2026, although there can be no assurance of that approval or timing. Upon approval, we believe PNT2003 will be the first radioequivalent to lutetium Lu 177 dotatate, which is indicated for the treatment of somatostatin receptor-positive gastroenteropancreatic neuroendocrine tumors (“GEP-NETs”), including foregut, midgut, and hindgut neuroendocrine tumors. We define radioequivalent as a radiopharmaceutical whose mechanism of action is determined to be equivalent to that of the reference product by the FDA, or a similar regulator outside the United States.

For more information, see Note 19, “Acquisitions” to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Our Portfolio of Commercial Products and Other Sources of Revenue

Radiopharmaceutical Oncology

Our commercial product in our Radiopharmaceutical Oncology category is:

Precision Diagnostics

Our commercial products in our Precision Diagnostics category include the following:

On January 1, 2026, we sold our SPECT business to SHINE, including TechneLite, NEUROLITE, Xenon Xe-133 Gas, and Cardiolite, the commercial products associated with the SPECT business, which have historically been included as part of our Precision Diagnostics product category.

Strategic Partnerships and Other Revenue

Our commercial products in our Strategic Partnerships and Other Revenue product category include the following:

Our Strategic Partnerships and Other Revenue, also includes revenue derived from partnerships with pharmaceutical companies and academic institutions that use our commercial or investigational products in clinical trials as research tools, as well as royalties and other milestone payments received from our strategic partners that have commercialized products pursuant to license arrangements with us, as well as CDMO revenue generated by Evergreen. For example, flurpiridaz is an F-18-based PET myocardial perfusion imaging (“MPI”) agent that we have licensed to GE HealthCare Limited (“GE Healthcare”). Flurpiridaz was approved by the FDA in 2024 under the name Flyrcado for PET MPI under rest or stress (pharmacologic or exercise) in adults with known or suspected coronary artery disease (“CAD”) to evaluate for myocardial ischemia and infarction. We have also licensed our piflufolastat F-18 PET imaging agent (marketed in the United States as PYLARIFY) to GE Healthcare in Japan for prostate cancer diagnostics and companion diagnostic use. Under the terms of the agreement, GE Healthcare paid us an upfront license fee and will pay us development milestones and tiered royalties based on product sales in Japan. Similarly, RELISTOR (methylnaltrexone bromide) is a treatment for opioid-induced constipation that decreases the constipating side effects induced by opioid pain medications such as morphine and codeine without diminishing their ability to relieve pain. RELISTOR is approved in two forms: a subcutaneous injection and an oral tablet. In 2011 Progenics licensed methylnaltrexone (“MNTX”) and products containing MNTX, including both approved forms of RELISTOR, to Salix Pharmaceuticals, Inc., an affiliate of Bausch Health Companies, Inc. (“Bausch”) and on August 2, 2023, we sold the right to the RELISTOR net sales royalties under that license agreement and retained the rights to future sales-based milestone payments. In addition, we have licensed Neuraceq to partners in selected markets including China, Japan, and South Korea. We receive sales-based royalties and milestone payments from these license agreements.

Additional Information about our Product Categories

Radiopharmaceutical Oncology

PYLARIFY is a widely utilized radiopharmaceutical diagnostic agent indicated for PET imaging of prostate-specific membrane antigen (“PSMA”)-positive lesions in patients with prostate cancer with suspected metastasis who are candidates for initial definitive therapy and in patients with suspected recurrence based on elevated PSA levels. PYLARIFY works by binding to PSMA, a protein that is overexpressed on the surface of more than 90% of primary and metastatic prostate cancer cells. PYLARIFY works with PET/CT technology to produce a combined scan that enables the scan reader to detect and locate the disease.

According to the American Cancer Society, prostate cancer is the second most common cancer in American men - one in eight American men will be diagnosed with prostate cancer in their lifetimes and over 3.7 million American men are currently living with prostate cancer.

PYLARIFY is manufactured on a diverse, F-18 distributor supply network of PMFs, ensuring convenient and reliable supply. After being made on a cyclotron at a PMF, the F-18 is then combined with certain chemical ingredients in specially designed chemistry synthesis boxes to manufacture PYLARIFY. The finished PYLARIFY is then quality control tested and transferred to a radiopharmacist who prepares and dispenses patient-specific doses of the final product. Because each PMF manufacturing PYLARIFY is deemed by the FDA to be a separate manufacturing site, each is separately approved by the FDA. We have a broad network of PMF manufacturing sites that provides geographic breadth, out-the-door time flexibility and added supply optionality, and we distribute doses of PYLARIFY to customers in 48 of 50 states, the District of Columbia and Puerto Rico.

In addition to our network of commercial PMFs, we also work with academic medical centers in the United States that have radioisotope-producing cyclotrons and that have expressed an interest in manufacturing PYLARIFY. For this initiative, we enter into a fee-for-service arrangement under which the academic medical center manufactures F-18 on its cyclotron and completes the manufacturing process for PYLARIFY. PYLARIFY can then be used by the academic medical center itself, and in some cases distributed to other customers under separate purchase agreements.

Our Healthcare Procedure Coding System code, which enables streamlined billing, went into effect as of January 1, 2022 and the Centers for Medicare & Medicaid Services (“CMS”) granted transitional pass-through payment status (“TPT Status”) in the hospital outpatient setting for PYLARIFY, enabling traditional Medicare fee-for-service (“FFS”) to provide separate payment for PYLARIFY in addition to the payment for the PET/CT procedure in that setting. TPT Status for PYLARIFY expired on December 31, 2024.

In November 2024, CMS released the final rule for its calendar year 2025 Medicare Hospital Outpatient Prospective Payment System (the “CMS 2025 OPPS Rule”), which recognizes the value and need for broad access in diagnostic radiopharmaceuticals. The CMS 2025 OPPS Rule provided separate payment for those diagnostic radiopharmaceuticals with per day costs greater than $630 based on their mean unit cost (“MUC”). In November 2025, CMS released the final rule for its calendar year 2026 Medicare Hospital Outpatient Prospective Payment System (the “CMS 2026 OPPS Rule”), which continues to provide for separate payment for diagnostic radiopharmaceuticals with per day costs greater than $655 based on their MUC. As a result, since January 1, 2025, CMS has maintained separate payment for PYLARIFY after the expiration of TPT Status for patients with traditional Medicare FFS insurance coverage who are treated in the hospital outpatient setting. The calendar year 2026 payment rate for PYLARIFY is listed in Addendum B of the CMS 2026 OPPS Rule. We plan to continue working with CMS on the potential adoption of payment based on Average Sales Price (“ASP”) rather than MUC in the future. We have been reporting ASP since our first dose sold, helping to provide a clear path forward for CMS to potentially make payments based on ASP instead of MUC.

The continued substantial revenue contribution from PYLARIFY will depend on our ability to clinically and commercially differentiate PYLARIFY from other products on the market and to maintain PYLARIFY as a widely utilized PSMA PET imaging agent in a competitive space. PYLARIFY’s current competition includes three Gallium-68 (“Ga-68”)-based PSMA imaging agents, an F-18-based PSMA imaging agent, and other non-PSMA-based imaging agents commonly referred to as conventional imaging. The potential for future generic entrants to the market as a result of the expiry of PYLARIFY’s five-year new chemical entity (“NCE”) exclusivity period in May 2026, on the fifth anniversary of the FDA’s approval, as well as the ongoing development of additional F-18 and Ga-68 tracers and new PSMA-isotopes, particularly Copper-64, could generate increased competition for PYLARIFY. Continued substantial revenue contribution from PYLARIFY will also depend on our ability to differentiate PYLARIFY, including through flexible and dependable access to PYLARIFY nationally, a best-in-class customer experience and through strategic contracts.

We actively pursue patents in connection with PYLARIFY, both in the United States and internationally. In the United States for PYLARIFY, we have patents listed in the FDA’s publication, “Approved Drug Products with Therapeutic Equivalence Evaluations” (the “Orange Book”), including composition of matter patents, the last of which expires in 2037. Outside of the United States, we have, and are currently pursuing, additional patents related to piflufolastat F-18 to obtain similar patent protection as in the United States.

In August 2025, we announced that the FDA had accepted our New Drug Application (“NDA”) for a new formulation of our F-18 PSMA PET imaging agent, filed by our subsidiary Aphelion, and that the FDA has set a Prescription Drug User Fee Act (“PDUFA”) target action date of March 6, 2026. The new formulation was designed to enhance product stability and increase batch production, with the potential to enhance supply flexibility and improve operating leverage across the network. If the NDA

is approved, we plan to work closely with clinicians and PMF sites to ensure a smooth rollout of the new formulation, including providing clear guidance on ordering, handling, and clinical use to support continuity of care for patients, and we plan to apply for reimbursement from CMS for the new formulation, including seeking three years of TPT Status.

See Part I, Item 1A. “Risk Factors” for information regarding certain risks associated with PYLARIFY and Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Comparison of the Periods Ended December 31, 2025 and 2024 - Revenues” of this Form 10-K for further information on total revenue contributed by PYLARIFY since its approval.

Precision Diagnostics

DEFINITY

DEFINITY is the most utilized ultrasound enhancing agent in the United States and is indicated for use in adult and pediatric patients with suboptimal echocardiograms to opacify the left ventricular chamber and to improve the delineation of the left ventricular endocardial border. Numerous patient conditions can decrease the quality of images of the left ventricle, the primary pumping chamber of the heart. The term DEFINITY refers to both its activated and non-activated forms.

DEFINITY is a clear, colorless, sterile liquid that, upon activation in a VIALMIX or VIALMIX RFID, medical devices specifically designed for DEFINITY, becomes a homogenous, opaque, milky white injectable suspension of perflutren-containing lipid microspheres. After activation and intravenous injection, DEFINITY opacifies the left ventricular chamber and improves the delineation of the left ventricular endocardial border, or innermost layer of tissue that lines the chamber of the left ventricle. Better visualization of the left ventricle allows clinicians to make more informed decisions about disease status.

Based on estimates from third party sources, we believe there were approximately 28 to 30 million echocardiograms performed in the United States in 2024 (the latest time period for which full year data is available). Assuming that between 20% and 30% of echocardiograms produce suboptimal images, as stated in the clinical literature, we estimate that approximately 5 to 9 million echocardiograms in 2024 produced suboptimal images.

Since its launch in 2001, DEFINITY has been used in imaging procedures in approximately 33 million echocardiograms throughout the world. In March 2024, we received FDA approval for our supplemental application for the use of DEFINITY in pediatric patients with suboptimal echocardiograms. The FDA decision was based on usage data from three pediatric clinical trials conducted with DEFINITY. We estimate that, as of December 31, 2025, DEFINITY had over 80% share of the U.S. segment for ultrasound enhancing agents in echocardiography procedures. DEFINITY currently competes with two other FDA-approved ultrasound enhancing agents, as well as echocardiography without the use of ultrasound enhancing agents and non-echocardiography imaging modalities from GE Healthcare and Bracco Diagnostics Inc. (“Bracco”). DEFINITY and the other FDA-approved ultrasound enhancing agents all carry an FDA-required boxed warning, which has been modified over time, to notify physicians and patients about potentially serious safety concerns or risks posed by the products. See Part I, Item 1A. “Risk Factors-Ultrasound enhancing agents may cause side effects which could limit our ability to sell DEFINITY,” of this Form 10-K for more information.

We continue to prosecute and maintain patents and patent applications in connection with DEFINITY, both in the United States and internationally. In the United States for DEFINITY, we have Orange Book-listed method-of-use patents, the last of which expires in 2037, as well as additional manufacturing patents that are not Orange Book-listed expiring in 2037. The Orange Book-listed patents include a patent on the use of VIALMIX RFID (see below), which expires in 2037; we have submitted VIALMIX RFID patent applications in major market countries and have received granted patents outside of the United States.

DEFINITY is activated through the use of medical devices branded as VIALMIX and VIALMIX RFID. The activation rate and time are controlled by VIALMIX RFID through the use of radio-frequency identification technology (“RFID”) to ensure reproducible activation of DEFINITY. The RFID tag, which is affixed to the vial label, enables the DEFINITY vial to be appropriately activated with the VIALMIX RFID activation device. We rely on Jubilant HollisterStier (“JHS”) as a significant supplier of DEFINITY. We also produce DEFINITY in our in-house manufacturing facility at our North Billerica campus.

See Part I, Item 1A. “Risk Factors” for information regarding certain risks associated with DEFINITY and Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Comparison of the Periods Ended December 31, 2025 and 2024 - Revenues” for further information on revenue contributed by DEFINITY.

Neuraceq

Similar to PYLARIFY, Neuraceq is manufactured by a nationwide network of PMFs with radioisotope-producing cyclotrons that make F-18, which has a 110-minute half-life, so Neuraceq is manufactured and distributed rapidly to end-users, and each PMF manufacturing site has to be separately approved by the FDA.

Neuraceq currently competes with two commercially available F-18 beta-amyloid-targeting PET imaging agents from Eli Lilly and Co (“Lilly”) and GE Healthcare. Growth and revenue contribution of Neuraceq is dependent on (i) our ability to engage our existing PYLARIFY customers to introduce Neuraceq to those customers, (ii) expanded geographical access to Neuraceq, which in turn depends on our ability to increase Neuraceq manufacturing capacity at existing manufacturing sites and add

additional sites, (iii) increased adoption and utilization of beta-amyloid PET and anti-amyloid therapeutics, (iv) increased utilization based on the updated Neuraceq prescribing information indicating that Neuraceq can be used for patient selection for anti-amyloid therapies where the prescribing information for the therapy so states, and (v) our ability to educate customers on the approved uses of Neuraceq, including its ability to quantify the degree of amyloid burden in the brain.

Our ability to grow revenue from Neuraceq is also dependent on our ability to clinically differentiate Neuraceq from competitive products so that customers choose Neuraceq for appropriate patients because of its clinical attributes and despite the disparity in MUC payment rates for Neuraceq compared to other products used for traditional Medicare patients in the hospital outpatient setting. MUC is an indirect measure of a product’s cost based on hospital-reported claims data. We believe MUC, which is based on claims data available on a two-year lag, is a less accurate reflection of actual purchasing costs of the hospital than ASP is. Because the volume of claims for Neuraceq was lower than our competitors’ volume in 2023, which was the year used by CMS to establish MUC-based reimbursement for 2025, our MUC calculation was dependent upon a fewer number of hospitals and fewer claims and was calculated at a lower rate than the rate established for our competitors’ products. We have engaged with CMS on the potential adoption of payment based on ASP instead of MUC.

Strategic Partnerships and Other Revenue

Biomarker Solutions

Our Biomarker Solutions business focuses on advancing innovative imaging biomarker solutions, such as our Alzheimer’s disease radiodiagnostic candidates, MK-6240, NAV-4694 and LNTH-2620, through collaborations with pharmaceutical companies and academic centers.

Our Biomarker Solutions business also includes our Microbubble Platform, in which we generally enter into collaborations with partners seeking to include our microbubble as part of a kit used with our partner’s medical device for therapeutic applications. In these collaborations, our microbubble is generally intended to be used as a vehicle to deliver a therapeutic drug. Our Digital Solutions business focuses on developing and commercializing 510(k) cleared and CE Marked digital applications to enhance the performance of imaging agents; our Digital Solutions portfolio currently includes aBSI and aPROMISE.

Oncology

As we continue to pursue expanding strategic partnerships, our Biomarker Solutions activities in oncology include:

Microbubble Platform

We previously entered into microbubble collaborations with strategic partners that are using our microbubbles in connection with the development of their medical devices. For example, CarThera SAS is developing SonoCloud, a proprietary implantable device in development for the treatment of recurrent glioblastoma that will be used in combination with our microbubbles. Similarly, Insightec Ltd. is developing a transcranial guided focused ultrasound device for the treatment of glioblastoma, as well as other neurodegenerative conditions, and such device will also be used in combination with our microbubbles.

Neurology

MK-6240

MK-6240 is a registrational stage F-18 tau-targeted PET imaging agent designed to detect tau neurofibrillary tangle pathology in patients with cognitive impairment being evaluated for known or suspected Alzheimer’s disease. During the second quarter of 2025, we announced that MK-6240 successfully met its co-primary endpoints in two pivotal studies assessing its sensitivity and specificity. The data from these two studies supported our NDA submission to the FDA. On October 27, 2025, we announced that the FDA had accepted our NDA for MK-6240, and the FDA has set a PDUFA target action date of August 13, 2026. MK-6240 is also being used as a biomarker in more than 100 ongoing academic and industry sponsored clinical trials, many for late-stage therapeutic candidates. Research revenue is derived from the use of MK-6240 in those clinical trials and includes milestone and dose-related payments.

NAV-4694

NAV-4694 is an investigational late-stage F-18-labeled PET imaging agent that targets beta amyloid in Alzheimer’s disease. NAV-4694 is currently in Phase 3 development and is also being used in academic and industry sponsored clinical trials. Research revenue is derived from the use of NAV-4694 in those clinical trials and includes milestone and dose-related payments.

LNTH-2620

LNTH-2620 is a next-generation radioactive tracer used in PET scans to detect and visualize tau protein tangles in the brain, a key biomarker for Alzheimer’s disease and other neurodegenerative disorders. LNTH-2620 is currently in a Phase 3 study.

CDMO Business

Through the Evergreen Merger, we acquired a current Good Manufacturing Practices (“cGMP”) certified radiopharmaceutical manufacturing facility that provides end-to-end manufacturing services for alpha- and beta-emitting radiopharmaceuticals, from early clinical development through commercial supply. Our CDMO offerings include process and analytical method development, technology transfer, process validation, production of clinical and commercial batches, release and stability testing, and integrated quality oversight under fully electronic Quality Management and Laboratory Information Management Systems. In addition, we coordinate raw material sourcing, just-in-time logistics, and packaging to facilitate timely delivery of finished product globally. Our CDMO’s strategic location near major transportation hubs enables reliable distribution for short half-life products and supports customers across diagnostic and therapeutic indications.

RELISTOR Royalty

On August 2, 2023, we sold our right to our RELISTOR net sales royalty asset under our license agreement with Bausch; we retained the rights to future sales-based milestone payments. We received an initial payment in 2023 of approximately $98.0 million in connection with the sale and earned additional consideration of $5.0 million in 2025 as a result of the achievement of a sales-based milestone. Pursuant to our license agreement with Bausch, we are eligible to receive one-time sales milestone payments upon achievement of specified United States. net sales targets, including:

During the fourth quarter of 2023, we earned the sales-based milestone payments listed above of $15.0 million. We did not earn any sales-based milestone payments from Bausch in 2024 or 2025. Each sales milestone payment is payable one time only, regardless of the number of times the condition is satisfied. The remaining milestone payments could be made within the same calendar year if the highest sales levels were reached in any single calendar year.

Other Strategic Partnerships and Other Revenue Sources

aBSI

aBSI automatically calculates the disease burden of prostate cancer by detecting and classifying bone scan tracer uptakes as metastatic or benign lesions using an artificial neural network. The cloud based aBSI was made available for clinical use in the United States on August 5, 2019. In February 2020, Progenics received a CE Mark for the standalone workstation model of aBSI, meeting the quality standards set by the European Economic Area. In September 2020, the FDA granted 510(k) clearance for the use of aBSI as software-as-a-medical device on a GE Healthcare imaging system.

aPROMISE, or PYLARIFY AI

aPROMISE, or PYLARIFY AI is an FDA-cleared AI medical device software that is designed to allow healthcare professionals and researchers to perform standardized quantitative assessment of PSMA PET/CT images in prostate cancer, including those images obtained by using PYLARIFY. Our subsidiary, EXINI, was granted 510(k) clearance by the FDA in the United States and received a CE Mark in Europe for aPROMISE, which is available under the name PYLARIFY AI in the United States.

Flurpiridaz

In 2017, we entered into a definitive, exclusive global Collaboration and License Agreement with GE Healthcare for development and worldwide commercialization of flurpiridaz, an F-18-based PET MPI agent designed to assess blood flow to the heart in patients suspected of CAD. Under the agreement, we received an upfront cash payment of $5.0 million and are eligible to receive up to $60.0 million in regulatory and sales milestone payments, tiered double-digit royalties on U.S. sales, and mid-single digit royalties on sales outside of the United States. In September 2024, GE Healthcare announced that it had received FDA approval of flurpiridaz under the name Flyrcado for coronary artery disease diagnosis and confirmed launch and availability of Flyrcado in April 2025.

Exclusive License for Prostate Cancer Imaging Agent Piflufolastat F-18 in Japan

On September 24, 2025, we announced an exclusive licensing agreement for GE Healthcare to develop, manufacture, and commercialize our piflufolastat F-18 PET imaging agent (marketed in the United States as PYLARIFY) in Japan for prostate cancer diagnostics and companion diagnostic use. Under the terms of the agreement, GE Healthcare paid us an upfront license fee and will pay us development milestones and tiered royalties based on product sales in Japan.

See Part I, Item 1A. “Risk Factors” for information regarding certain risks associated with our strategic activities.

Our Clinical Development Candidates

In addition to our commercial products and strategic partnerships with third parties, we also have ongoing clinical development programs, including the following:

For the years ended December 31, 2025, 2024 and 2023, we invested $177.3 million, $168.1 million and $77.7 million in research and development (“R&D”), respectively, primarily related to our clinical development candidates. In addition to our clinical development group, our R&D team also includes our Medical Affairs, Regulatory, Clinical Operations, Research and Pharmaceutical Development, and Isotope Strategy functions.

See Part I, Item 1A. “Risk Factors” for information regarding certain risks associated with our strategic partnerships and clinical development programs.

Distribution, Marketing and Sales

The following table sets forth certain key market information for each of our commercial pharmaceutical products within each product category:

*Approved under the name PYLCLARI and licensed to Curium.

With respect to our medical devices:

PYLARIFY sales are generated in the United States through an internal PYLARIFY sales team, as well as a sales team at some of our PMF partners. Sales of DEFINITY are generated in the United States through an internal DEFINITY sales team. Sales of Neuraceq are generated in the United States through an internal Neuraceq sales team and in European markets through a third-party distributor. We have licensed RELISTOR to Bausch, and while we have sold the right to our RELISTOR net sales royalties under our license agreement, we have retained the rights to future sales-based milestone payments generated by Bausch.

Flyrcado is licensed to GE Healthcare and we are entitled to milestone and royalty-based payments for Flyrcado.

Seasonality

We have some modest seasonality for our products as patients may seek to schedule diagnostic imaging and other procedures less frequently during the summer vacation months and over the year-end holidays.

Customers

No customer accounted for greater than 10% of revenues for the years ended December 31, 2025, 2024, and 2023.

Backlog

Our backlog consists of orders for which a delivery schedule within the next twelve months has been specified. Orders included in backlog may be canceled or rescheduled by customers at any time. We do not believe that our backlog at any particular time is meaningful because it has historically been immaterial relative to our consolidated revenues and is not necessarily indicative of future revenues for any given period.

Competition

We believe that our key product characteristics, such as proven efficacy, reliability and safety, coupled with our core competencies, such as our efficient manufacturing processes, our established distribution network, our experienced field sales organization and our customer service focus, as well as our expanding product portfolio, are important factors that distinguish us from our competitors.

The markets for our products are highly competitive and continually evolving. Our competitors for our current commercial products and leading clinical development candidates include large, global companies that are more diversified than we are and that have substantial financial, manufacturing, sales and marketing, distribution and other resources.

Any product candidates that we successfully develop and commercialize will compete with existing products and new products that may become available in the future, not only for customers but also for manufacturing resources, raw materials and, for our diagnostic imaging agents, staff at imaging centers and hospitals and PET scanner capacity. For example, for PNT2003, our principal competitors may include Novartis AG; ITM Radiopharma; Curium, and RayzeBio (acquired by Bristol Myers Squibb). For MK-6240 and NAV-4694, our principal competitors may include Lilly and GE Healthcare. For LNTH-2501, our principal competitors may include Curium and Novartis AG.

We cannot anticipate the actions of our current or future competitors in the same or competing modalities, such as significant price reductions on competitive products, the ability to offer a portfolio of products and offer price reductions across a portfolio, development of new products that are more cost-effective or have superior performance than our current or future products, the introduction of generic versions after our proprietary products lose their patent or regulatory exclusivity protection, the ability to secure better manufacturing locations or times for production of current or future products that limit the availability of necessary raw materials, production equipment or, for our diagnostic agents, scanning equipment. In addition, distributors of our products could attempt to shift end-users to competing modalities and products, or bundle the sale of a portfolio of products, in either case to the detriment of our specific products. Our current or future products could be rendered obsolete or uneconomical as a result of these activities.

Further, the radiopharmaceutical and biopharmaceutical industry continues to evolve strategically, with several market participants previously acquired by larger companies that may have more significant resources than ours. In addition, the supply-demand dynamics of the industry are complex because of large market positions of some participants, legacy businesses, government subsidies (in particular, relating to the manufacture of radioisotopes), government reimbursement policies, such as TPT Status, and group purchasing arrangements. We cannot predict what impact new owners and new operators may have on the strategic decision-making of our competitors, customers, and suppliers.

Raw Materials and Supply Relationships

We rely on certain raw materials and supplies to produce our products. Due to the specialized nature of our products and the limited, and sometimes intermittent, supply of raw materials available in the market, we have established relationships with several key suppliers. For the year ended December 31, 2025, our largest suppliers of raw materials and supplies were Institute for Radioelements (“IRE”), the Australian Nuclear Science and Technology Organisation (“ANSTO”), and NTP Radioisotopes

(“NTP”), which, in the aggregate, accounted for approximately 6.3% of our total purchases and related specifically to TechneLite, which was included in the sale of our SPECT business to SHINE on January 1, 2026.

Other Materials

We have additional supply arrangements for active pharmaceutical ingredients, excipients, packaging materials and other materials and components, some of which are sole-sourced, and all of which we currently believe are either in good standing or replaceable without any material disruption to our business. However, if a supplier is unable to provide required materials or equipment and a readily available substitute does not exist, we may experience delays while identifying and qualifying alternative suppliers, which may involve significant time, cost, and regulatory approval. Such delays could disrupt manufacturing, increase expenses, and negatively impact our business, financial condition, and results of operations.

See Part I, Item 1A. “Risk Factors” of this Form 10-K for information regarding certain risks associated with our raw materials and supply arrangements.

Manufacturing

The commercial manufacture of PYLARIFY and Neuraceq requires us to create a field-based network of specialized PMFs with radioisotope-producing cyclotrons. The radioisotope used in both PYLARIFY and Neuraceq is F-18, which has a 110-minute half-life, requiring that this agent be manufactured and distributed rapidly to end-users. After being made on a cyclotron at a PMF, the F-18 is combined with certain specifically designed ingredients in chemistry synthesis boxes to manufacture PYLARIFY or Neuraceq, as applicable. The finished PYLARIFY or Neuraceq is then quality control tested and transferred to a radiopharmacist who prepares and dispenses patient-specific doses from the final product. Because each of the PMFs manufacturing PYLARIFY and Neuraceq is deemed by the FDA to be a separate manufacturing site, each requires separate FDA approval for each product manufactured.

We have a specialized in-house FDA-approved manufacturing facility at our North Billerica campus for purposes of producing DEFINITY. DEFINITY manufactured at this facility first became commercially available on February 23, 2022. We believe this investment provides supply chain redundancy, improved flexibility and reduced costs in a potentially more price competitive environment.

We manufacture, finish and distribute our radiopharmaceutical products, including PYLARIFY and Neuraceq, through a network of specialized manufacturers on a just-in-time basis, and supply our customers with these products either by next day delivery services or by ground or air custom logistics.

Manufacturing and Supply Arrangements

We currently have the following technology transfer and manufacturing and supply agreements in place for some of our major products:

See Part I, Item 1A. “Risk Factors” of this Form 10-K for information regarding certain risks associated with our manufacturing and supply relationships.

Intellectual Property Matters

Patents, trademarks and other intellectual property rights, both in the U.S. and foreign countries, are very important to our business. We also rely on trade secrets, manufacturing know-how, technological innovations, licensing agreements and confidentiality agreements and regulatory exclusivities to maintain and improve our competitive position. We review third party proprietary rights, including patents and patent applications, as available, in an effort to develop an effective intellectual property strategy, avoid infringement of third party proprietary rights, identify licensing opportunities and monitor the intellectual property owned by others.

Description of Patent Rights

Patents grant the legal right to exclude others from practicing an invention. In the United States, patent rights prohibit (subject to certain exceptions) others from making, using, selling, offering for sale, or importing the claimed invention without the permission of the patentee.

Patent rights are territorial and must be obtained in every jurisdiction in which protection is desired. The legal requirements for obtaining a patent vary by jurisdiction and can include the requirement that the claimed subject matter is new (novel) and nonobvious (or inventive). Other requirements, depending on jurisdiction, can include that the invention be adequately described so as to enable others to make and use it, and that the inventors be properly identified.

Patent rights are defined by the claims set forth in the granted patent, which define the scope of the right to exclude others from practicing the patented invention. Patent infringement arises when a third party practices without authorization, each element of the claims set forth in the granted patent. It is also possible to indirectly infringe a patent, such as by inducing a third party to directly infringe the patent, or by contributorily infringing by making a material component of the invention that is not subject to any substantial non-infringing use.

Duration of Patent Rights

Patents are granted for limited periods of time. In the United States, the standard patent term is 20 years from the earliest nonprovisional filing to which the patent claims priority. The patent term can be extended as a result of delays in the patent office, resulting in patent term adjustment.

In addition, patent term extension can compensate for time lost during product development and the regulatory review process by returning up to five years of patent life for a patent that covers a new product or its use.

Patent Litigation

Patent rights are not self-executing and may need to be asserted, such as through litigation. Litigation typically starts when a patentee sues a defendant alleging infringement of one or more patents. It can also occur when the target of a perceived patent assertion preemptively files a lawsuit, a so-called declaratory judgment action, seeking a declaration by a court that it does not infringe a patent or that the patent is invalid. In the United States, patent litigation is conducted in federal district court with a right of appeal to the United States Court of Appeals for the Federal Circuit, and discretionary review by petition to the Supreme Court of the United States.

In the United States, patent cases are generally tried to a jury, with the exception of Hatch-Waxman cases, discussed below, which are tried to a judge. The judge determines the meaning of disputed claim terms during a process called claim construction.

Patent litigation can be expensive and burdensome, both in terms of time, money, and company resources. The outcome of patent litigation is always uncertain to varying degrees. The subject matter is often highly technical and difficult for lay juries, and judges, to understand. Context is provided by dueling experts about whom the fact-finder must make credibility determinations. The issue of infringement frequently turns on the construction (interpretation) of particular claim language during a process culminating in a so-called “Markman Order.”

During patent litigation, the validity of the patents is almost always challenged, because invalidity is a defense to infringement. Although a patent is presumed valid, this presumption can be overcome by clear and convincing evidence. In the United States, typical grounds for challenge include lack of novelty or obviousness by introducing evidence of relevant “prior art,” referring to activity that pre-dated the relevant priority dates of the challenged patents. During litigation, patent challengers often devote significant resources to identifying prior art from repositories around the world, often far exceeding the search capacities and budgets of the patent offices that conducted screening searches before issuing the patents in the first instance.

Other grounds of challenge in the United States include lack of written description and enablement, generally alleging that the full scope of the claimed invention was either not in the possession of the inventor of the time of filing or that one of skill in the art would not have been able to practice the full scope of the invention without undue experimentation. Both of these inquiries are highly fact-specific. Improper inventorship can be the basis for an invalidity challenge, as can an allegation that the patent is not the subject of statutory subject matter, which is known as a so-called “Section 101” challenge.

Although patent infringement actions are tried in district courts, patent validity can also be challenged in special proceedings before the U.S. Patent and Trademark Office (“USPTO”), such as Inter Partes Reviews and Post-Grant Reviews.

Patent-related Aspects of Regulatory Matters

The FDA approval process for drugs is described below, including NDAs for innovator drugs, ANDAs for generics, and 505(b)(2) applications for modifications to formulations or uses of products previously approved by the FDA. See “Regulatory Matters” below for more information. Below is a description of the roles played by patents in relevant regulatory framework.

First, in seeking approval for a drug through an NDA, including a 505(b)(2) NDA, applicants are required to list with the FDA each patent with claims that cover the applicant’s drug, which is later published in the Orange Book. The FDA approved

drugs listed in the Orange Book can serve as a basis for comparison by the FDA when evaluating the bioequivalence of new generic drugs. An FDA approved drug relied upon for comparison is referred to as a “reference listed drug” (“RLD”) and may be cited by potential competitors in support of approval of an ANDA or 505(b)(2) application. See “Regulatory Matters – Hatch-Waxman Act” below for more information.

With respect to any RLD patents listed in the Orange Book, the applicant must certify to one of the following four items: (i) the required patent information has not been filed; (ii) the listed patent has expired; (iii) the listed patent has not expired, but will expire on a particular date and approval is sought after patent expiration; or (iv) the listed patent is invalid or will not be infringed by the new drug.

A certification to the fourth item (a so-called a Paragraph IV certification) constitutes a technical act of patent infringement under the U.S. Patent Laws, which can give rise to litigation to determine whether or not the product, if approved and launched, would infringe the listed patents, and whether those patents are invalid. The applicant may also elect to submit a "section viii" statement certifying that its proposed label does not contain (or carves out) any language regarding the patented method-of-use rather than certify to a listed method-of-use patent. The first company or companies to submit an application that (1) is determined by the FDA to be “substantially complete” upon submission and (2) contains a paragraph IV certification to at least one of the patents listed in the Orange Book is generally eligible for the exclusive right to market the generic drug for 180 days.

After filing a Paragraph IV certification, the applicant has 45 days from filing to submit a “Notice Letter” to the Orange Book patent holder. The patent holder can then sue for infringement. The resulting litigation is known as Hatch-Waxman litigation. If the patent holder sues for infringement within 45 days of receiving this Notice Letter, the FDA cannot approve the application for 30 months (the so-called “30 month stay”), unless the patents expire in the interim, the lawsuit is settled, or there is decision on the merits favorable to applicant.

Independent of the 30-month stay, the FDA also will not approve a 505(b)(2) NDA or an ANDA application that references an RLD until any applicable non-patent exclusivity listed in the Orange Book for the respective RLD has expired. See “Regulatory Matters – Hatch-Waxman Act” below for more information.

Trademarks, Service Marks and Trade Names

We own various trademarks, service marks, and trade names, including, among others, PYLARIFY, DEFINITY, Neuraceq and Find Fight and Follow. We have generally registered these trademarks, as well as others, in the United States and/or numerous foreign jurisdictions.

Trade Secrets

We possess considerable know-how, including trade secrets from which we derive commercial value. In addition to patents, we rely, where necessary, upon unpatented trade secrets and know-how, proprietary information and continuing technological innovation to develop and maintain our competitive position. We seek to protect our proprietary information, in part, using confidentiality agreements with our collaborators, employees, consultants and other third parties and invention assignment agreements with our employees.

Intellectual Property Protection on Selected Assets

Our intellectual property (“IP”) assets include patents that we own and those to which we have licenses. We typically seek patent protection in major markets around the world, including, among others, the United States, Canada, Western Europe, Asia, Central America, and South America.

All patent terms described below are presented without giving effect to any applicable patent term adjustments or regulatory extensions. In addition, a list of Orange Book-listed patents, together with expiration dates, and applicable regulatory exclusivity can be obtained from the FDA through its website.

Further comments on selected IP assets are below:

aPROMISE — U.S. patents and pending patent applications worldwide relating to automated medical image analysis, have expiration dates ranging from 2037 to 2041.

aBSI — We own patents relating to automated detection of bone cancer metastases. The patents on this technology expire in the United States in 2032 and outside of the United States in 2028. Further, we own a U.S. patent and have patent applications that are pending in the United States and worldwide relating to aBSI improvements, which have expiration ranging from 2040 to 2041.

DEFINITY — A portfolio of patents protects the use and manufacturing of DEFINITY and also the VIALMIX RFID device, both in the United States and internationally. Currently, there are nine Orange Book-listed patents for DEFINITY. Our longest duration Orange Book-listed DEFINITY patent extends until May 2037.

Flyrcado (flurpiridaz) — We own patents and patent applications in numerous jurisdictions covering composition, use, formulation, and manufacturing, including in the United States a composition of matter patent expiring in 2026, a formulation patent expiring in 2032, a method-of-use patent expiring in 2028, and manufacturing-related patents expiring in 2031 and 2033, and various patent applications, some of which, if granted, will expire in 2033.

LNTH-1363S — We exclusively license patent applications directed to compositions of matter and methods of use of LNTH-1363S. If granted, the last patent will expire in 2043.

LNTH-2403 - An LRRC15-targeted radiotherapeutic. We own two patent applications covering LNTH-2403 compositions of matter, method of use, and combination therapies, the last of which expires in 2045.

LNTH-2501 - We do not own or license any patents or patent applications relating to this asset.

LNTH-2620 - We co-own with AC Immune SA patents directed to composition of matter and methods of use of LNTH-2620, which expire in 2037.

MK-6240 — We exclusively license patents directed to composition of matter and methods of use of MK-6240 which expire in 2035.

NAV-4694 — We exclusively license patents directed to composition of matter, methods of use and methods of manufacturing of NAV-4694 which expire in 2028 and 2029.

Neuraceq - A portfolio of patents protects Neuraceq, both in the United States and internationally. Currently, there are two Orange Book-listed patents for Neuraceq. Our longest duration Orange Book-listed Neuraceq patent extends until July 2032.

PYLARIFY — A portfolio of patents protects PYLARIFY, both in the United States and internationally, and we continue to pursue additional patent protection. Currently, there are six Orange Book-listed patents for PYLARIFY. Our longest duration Orange Book-listed PYLARIFY patent extends until June 2037. The NCE-1 date for PYLARIFY was May 26, 2025. As described below, this is the date after which the FDA is allowed to accept an ANDA or 505(b)(2) applications from generic challengers. If this happens, we could elect to pursue Hatch-Waxman litigation and trigger the 30-month stay described above, see “Intellectual Property Matters – Patent-related Aspects of Regulatory Matters” above for more information; during the stay, the FDA is prohibited from approving, other than as a tentative approval, the challenger’s application until the lawsuit is settled or there is a decision on the merits favorable to applicant.

PNT2002 — We exclusively license granted U.S. patents and pending U.S. patent applications, as well as pending patent applications in jurisdictions outside of the United States directed to formulations, use, and manufacturing of PNT2002. The granted U.S. patents expire in 2041.

PNT2003 — We exclusively license pending U.S. patent applications, as well as pending patent applications in jurisdictions outside of the United States directed to formulations, use, and manufacturing of PNT2003 which, if granted, would expire in 2043.

See Part I, Item 1A. “Risk Factors” of this Form 10-K for information regarding certain risks associated with our intellectual property.

Regulatory Matters

Food and Drug Laws

The development, manufacture and commercialization of our products are subject to comprehensive governmental regulation both within and outside the United States. A number of factors substantially increase the time, difficulty, and costs incurred in obtaining and maintaining the approval to market newly developed and existing products. These factors include governmental regulation, such as detailed inspection of and controls over research and laboratory procedures, clinical trials, manufacturing, marketing, advertising and promotion, sampling, distribution, import and export, record keeping and storage and disposal practices, together with various post-marketing requirements. Governmental regulatory actions can result in the seizure or recall of products, suspension or revocation of the authority necessary for their production and sale, as well as other civil or criminal sanctions.

Our activities related to the development, manufacture, packaging, or repackaging of our products subject us to a wide variety of laws and regulations. We are required to register for permits and/or licenses with, seek approvals from and comply with operating and security standards of, the FDA, the U.S. Nuclear Regulatory Commission (“NRC”), the U.S. Department of Health and Human Services, Health Canada, the European Medicines Agency, the U.K. Medicines and Healthcare Products Regulatory Agency, the NMPA and various state and provincial boards of pharmacy, state and provincial controlled substance agencies, state and provincial health departments and/or comparable state and provincial agencies, as well as foreign agencies, and certain accrediting bodies depending upon the type of operations and location of product distribution, manufacturing and sale.

The FDA and various state regulatory authorities regulate the research, testing, manufacture, safety, labeling, storage, recordkeeping, premarket approval, marketing, advertising and promotion, import and export, and sales and distribution of pharmaceutical products in the United States. Prior to marketing a pharmaceutical product, we must first receive FDA approval. In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act (“FDCA”) and implementing regulations. The process of obtaining regulatory approvals and compliance with appropriate federal, state, local, and foreign statutes and regulations requires the expenditure of substantial time and financial resources. Currently, the process required by the FDA before a drug product may be marketed in the United States generally involves the following:

The testing and approval process requires substantial time, effort, and financial resources, and we cannot be certain that any approvals for our products in development will be granted on a timely basis, if at all. Once a pharmaceutical product is identified for development, it enters the preclinical testing stage. Preclinical tests include laboratory evaluations of product chemistry, toxicity, formulation, and stability, as well as animal studies to assess its potential safety and efficacy. This testing culminates in the submission of the IND application to the FDA.

Once the IND application becomes effective, including review and approval by any IRB serving any of the institutions participating in the clinical trial, the clinical trial program may begin. Each new clinical trial protocol must be submitted to the FDA before the trial may begin. The person, entity or organization taking responsibility for the trial is referred to as the clinical trial sponsor. Human clinical trials are typically conducted in three sequential phases that may overlap or be combined:

Progress reports detailing the results of the clinical trials must be submitted at least annually to the FDA and safety reports must be submitted to the FDA and the investigators for serious and unexpected adverse events. Submissions must also be made to inform the FDA of certain changes to the clinical trial protocol. Federal law also requires the sponsor to register the trials on public databases when they are initiated, and to disclose the results of the trials on public databases upon completion. Phase 1, Phase 2 and Phase 3 clinical trials may not be completed successfully within any specified period, if at all. The FDA or the clinical trial sponsor may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects or patients are being exposed to an unacceptable health risk. Similarly, any IRB serving any of the institutions participating in the clinical trial can suspend or terminate approval of a clinical trial at an institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the product has been associated with unexpected serious harm to patients. Failure to register a clinical trial or disclose study results within the required time periods could result in penalties, including civil monetary penalties.

Concurrent with clinical trials, companies usually complete additional animal studies and must also develop additional information about the chemistry and physical characteristics of the product and finalize a process for manufacturing the product in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the product and, among other things, the manufacturer must develop methods for testing the identity, strength, quality and purity of the final product. Additionally, appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the product does not undergo unacceptable deterioration over its shelf life.

The results of product development, preclinical studies and clinical trials, along with descriptions of the manufacturing process, analytical tests conducted on the drug product, proposed labeling, and other relevant information, are submitted to the FDA as part of an NDA for a new drug, requesting approval to market the product. The submission of an NDA is subject to the payment of a substantial user fee. A waiver of that fee may be obtained under certain limited circumstances. The approval process is lengthy and difficult, and the FDA may refuse to approve an NDA if the applicable regulatory criteria are not satisfied. The FDA has substantial discretion in the product approval process, and it is impossible to predict whether and when the FDA will grant marketing approval. While the FDA grants PDUFA target dates, these target dates may be extended due to agency requests for information or delays related to agency personnel developments. The FDA may on occasion require the sponsor of an NDA to conduct additional clinical trials or to provide other scientific or technical information about the product, and these additional requirements may lead to unanticipated delay or expense. Even if such data and information are submitted, the FDA may ultimately decide that the NDA does not satisfy the criteria for approval. Data obtained from clinical trials are not always conclusive, and the FDA may interpret data differently than we interpret the same data.

If a product receives regulatory approval, the approval may be significantly limited to specific diseases and dosages or the indications for use may otherwise be limited, which could restrict the commercial value of the product. Further, the FDA may require that certain contraindications, warnings or precautions be included in the product labeling. In addition, the FDA may require Phase 4 testing which involves clinical trials designed to further assess a drug product’s safety and effectiveness after NDA approval. The FDA also may impose one or more Risk Evaluation and Mitigation Strategies (“REMS”) and Elements to Assure Safe Use to ensure that the benefits of a product outweigh its risks. A REMS could add training requirements for healthcare professionals, safety communications efforts and limits on channels of distribution, among other things. The sponsor would be required to evaluate and monitor the various REMS activities and adjust them if need be. Whether a REMS would be imposed on any of our products and any resulting financial impact is uncertain at this time.

Under the Orphan Drug Act, the FDA may designate a product as an Orphan Drug if it is a drug intended to treat a rare disease or condition, which is generally defined as a patient population of fewer than 200,000 individuals annually in the United States, or a patient population greater than 200,000 in the United States where there is no reasonable expectation that the cost of developing the drug will be recovered from sales in the United States.

In the United States, Orphan Drug designation entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages and user-fee waivers. In addition, if a product that has Orphan Drug designation subsequently receives the first FDA approval for the indication for which it has such designation, the product is entitled to Orphan Drug exclusivity, which means the FDA may not approve any other application to market the same drug for the same indication for a period of seven years, except in limited circumstances, such as a showing of clinical superiority over the product with orphan exclusivity or where the manufacturer is unable to assure sufficient product quantity.

Any drug products for which we receive FDA approvals are subject to continuing regulation by the FDA, including, among other things, record-keeping requirements, reporting of adverse experiences with the product, providing the FDA with updated safety and efficacy information, product sampling and distribution requirements, complying with certain electronic records and signature requirements, and complying with FDA promotion and advertising requirements. The FDA strictly regulates labeling, advertising, promotion and other types of information on drug products that are placed on the market. Drugs may be promoted only for the approved indications and consistent with the provisions of the approved label and promotional claims must be appropriately balanced with important safety information and otherwise be adequately substantiated. Further, manufacturers of drugs must continue to comply with cGMP requirements, which are extensive and require considerable time, resources and ongoing investment to ensure compliance. In addition, changes to the manufacturing process generally require prior FDA approval before being implemented, and other types of changes to the approved product, such as adding new indications and additional labeling claims, are also subject to further FDA review and approval.

Drug product manufacturers and other entities involved in the manufacturing and distribution of approved drugs products are required to register their establishments with the FDA and certain state agencies, and are subject to periodic unannounced inspections by the FDA and certain other agencies for compliance with cGMP and other laws. The cGMP requirements apply to all stages of the manufacturing process, including the production, processing, sterilization, packaging, labeling, storage and shipment of the drug product. Manufacturers must establish validated systems to ensure that products meet specifications and regulatory standards, and test each product batch or lot prior to its release. In addition, manufacturers of commercial PET products such as PYLARIFY and Neuraceq, including radiopharmacies, hospitals, and academic medical centers, are required to submit either an NDA or ANDA in order to produce PET drugs for clinical use, or produce the drugs under an IND.

The FDA also regulates the preclinical and clinical testing, design, manufacture, safety, efficacy, labeling, storage, record keeping, sales and distribution, post-market adverse event reporting, import/export and advertising and promotion of any medical devices that we distribute pursuant to the FDCA and FDA’s implementing regulations. The Federal Trade Commission shares jurisdiction with the FDA over the promotion and advertising of certain medical devices. The FDA can also impose restrictions on the sale, distribution or use of medical devices at the time of their clearance or approval, or subsequent to marketing. Currently, medical devices comprise only a small portion of our revenues.

The FDA may withdraw marketing authorization for a product if compliance with regulatory standards is not maintained or if problems occur after the product reaches the market. The exercise of broad regulatory powers by the FDA continues to result in increases in the amount of testing and documentation required for approval or clearance of new drugs and devices, all of which add to the expense of product introduction and the cost of continuing to make an approved drug or device available. Later discovery of previously unknown problems with a product may result in restrictions on the product or even complete withdrawal of the product from the market. Further, the failure to maintain compliance with regulatory requirements may result in administrative or judicial actions, such as fines, civil monetary penalties, warning letters, holds on clinical trials, product recalls or seizures, product detention or refusal to permit the import or export of products, refusal to approve pending applications or supplements, restrictions on marketing or manufacturing, injunctions, or civil or criminal penalties. In addition, regulations are subject to change as a result of legislative, administrative or judicial action, which may also increase our costs or reduce sales or otherwise adversely impact our products.

Because our operations include the manufacture and distribution of medical radioisotopes and other medical products, we are subject to regulation by the NRC and the departments of health of each state in which we operate and the applicable state boards of pharmacy. In addition, the FDA is also involved in the regulation of cyclotron facilities where PET products are produced in compliance with cGMP requirements and U.S. Pharmacopeia requirements for PET drug compounding.

Drug laws also are in effect in the non-U.S. markets in which we or our partners conduct business. These laws range from comprehensive drug approval requirements to requests for product data or certifications. In addition, inspection of and controls over manufacturing, as well as monitoring of adverse events, are components of most of these regulatory systems. Our business is subject to varying degrees of governmental regulation in the countries in which we or our partners operate, and the general trend is toward increasingly stringent regulation.

To assess and facilitate compliance with applicable FDA, NRC and other state, federal and foreign regulatory requirements, we regularly review our quality systems to assess their effectiveness and identify areas for improvement. As part of our quality review, we perform assessments of our suppliers of the raw materials that are incorporated into products and conduct quality management reviews designed to inform management of key issues that may affect the quality of our products. From time to time, we may determine that products we manufactured or marketed do not meet our specifications, published standards, such as those issued by the International Standards Organization, or regulatory requirements. When a quality or regulatory issue is identified, we investigate the issue and take appropriate corrective action, such as withdrawal of the product from the market, correction of the product at the customer location, notice to the customer of revised labeling and other actions.

Hatch-Waxman Act

The Hatch-Waxman Act added two pathways for FDA drug approval. First, the Hatch-Waxman Act permits the FDA to approve ANDAs for generic versions of drugs if the ANDA applicant demonstrates, among other things, that its product is bioequivalent to the innovator product and provides relevant chemistry, manufacturing and product data. See “Intellectual Property Matters,” above for more information. Second, the Hatch-Waxman Act created what is known as a Section 505(b)(2) NDA, which requires the same information as a full NDA (known as a Section 505(b)(1) NDA), including full reports of clinical and preclinical studies but allows some of the information from the reports required for marketing approval to come from studies which the applicant does not own or have a legal right of reference. A Section 505(b)(2) NDA permits a manufacturer to obtain marketing approval for a drug without needing to conduct or obtain a right of reference for all of the studies that would be required for a Section 505(b)(1) NDA submission.

Under the Hatch-Waxman Act, the FDA can approve ANDAs for generic versions of drugs before the expiration of an Orange Book-listed patent covering the innovator product if the ANDA applicant demonstrates, among other things, that (i) its generic candidate is the same as the innovator product by establishing bioequivalence and providing relevant chemistry, manufacturing and product data, and (ii) either the marketing of that generic candidate does not infringe the Orange Book-listed patent(s) or the Orange Book-listed patent(s) is invalid. Similarly, the FDA can approve a Section 505(b)(2) NDA from an applicant that relies on some of the information required for marketing approval to come from studies which the applicant does not own or have a legal right of reference. An applicant submitting an application relying on either the ANDA or this Section 505(b)(2) approval pathway must also give Notice to the innovator, which would then enable the innovator to file suit against the applicant within 45 days of receiving the Notice. If the innovator challenges the applicant in court in a timely manner, then FDA approval to commercialize the generic candidate will be stayed (that is, delayed) for up to 30 months while the dispute is resolved in court. The 30-month stay can be shortened if the patent infringement suit is resolved in the applicant’s favor before the 30-month stay expires, and this may involve a successful challenge of the patent’s validity in USPTO proceedings and appeals process. In the event a 505(b)(2) applicant does not rely on studies related to the innovator product, the 30-month stay would not apply, but additional clinical trials may be required by the FDA for approval. We can give no assurance that we would have grounds to file a patent infringement suit, that we would obtain the full 30-month stay, that we would be successful on the merits asserting that an Applicant infringes our Orange Book-listed patent, or that we would be successful defending the validity of our Orange Book-listed patent in court or in a USPTO adversarial proceeding if a third party were to submit an ANDA or Section 505(b)(2) NDA application to the FDA in connection with one of our commercial products.

The Hatch-Waxman Act also provides for: (1) restoration of a portion of a product’s patent term that was lost during clinical development and application review by the FDA; and (2) statutory protection, known as exclusivity, against the FDA’s acceptance or approval of certain competitor applications.

Under U.S. law, patent term extension can compensate for time lost during product development and the regulatory review process by returning up to five years of patent life for a patent that covers a new product or its use. This period is generally one-half the time between the effective date of an IND application and the submission date of an NDA, plus the time between the submission date of an NDA and the approval of that application. Patent term extensions, however, are subject to a maximum extension of five years, and the patent term extension cannot extend the remaining term of a patent beyond a total of 14 years. The application for patent term extension is subject to approval by the USPTO in conjunction with the FDA.

The Hatch-Waxman Act also provides for a period of statutory protection for new drugs that receive NDA approval from the FDA. If the FDA approves a Section 505(b)(1) NDA for a new drug that is an NCE, meaning that the FDA has not previously approved any other new drug containing the same active moiety, then the Hatch-Waxman Act prohibits the submission or approval of an ANDA or a Section 505(b)(2) NDA for a period of five years from the date of approval of the NDA, except that the FDA may accept an application for review after four years under certain circumstances, specifically a patent challenge for one or more patents listed by the NDA holder in the Orange Book, submitted in a “Paragraph IV” Certification. Because this four-year date occurs one year before the end of the five-year NCE exclusivity, it is commonly referred to as the “NCE-1” date.

The Hatch-Waxman Act will not prevent the filing or approval of a full NDA, as opposed to an ANDA or Section 505(b)(2) NDA, for any drug, but the competitor would be required to conduct its own clinical trials, and any use of the drug for which marketing approval is sought could not violate another NDA holder’s patent claims.

The Hatch-Waxman Act provides for a three-year period of exclusivity for an NDA for a new drug containing an active moiety that was previously approved by the FDA, but also includes new clinical data (other than bioavailability and bioequivalence studies) to support an innovation over the previously-approved drug and those studies were conducted or sponsored by the applicant and were essential to approval of the application. This three-year exclusivity period does not prohibit the FDA from accepting an application from a third party for a drug with that same innovation, but it does prohibit the FDA from approving that application for the three-year period. The three-year exclusivity does not prohibit the FDA, with limited exceptions, from approving generic drugs containing the same active ingredient but without the new innovation.

Reimbursement

The successful commercialization of our products is also subject to the availability of appropriate third-party coding, coverage, and payment for our customers. Third-party payors in the United States include private payors, including managed care providers, and State and Federal healthcare programs, such as Medicare and Medicaid. The process for determining whether a payor will provide coverage for a product may be separate from the process for setting the price or reimbursement rate that the payor will pay for the product. Coverage of a product does not ensure there will be an appropriate reimbursement amount for such product and the process to ensure appropriate reimbursement is outside our control. For private payors, coverage and reimbursement of our products vary from private payor to private payor. Many private payors, such as managed care providers, manage access to products, and may use medical policies (which may include specific coverage requirements such as prior authorization, re-authorization and achieving performance metrics under value-based contracts) to control utilization. Exclusion from, or restriction in coverage can reduce product use. For government payors, we participate, as required, in the Medicaid drug rebate program, the Federal Supply Schedule and the Public Health Service Act 340B program, which each require discounts for participation and may be subject to change. For Medicare, reimbursement to customers for our products is generally established through the rulemaking process or in discussion with Medicare Administrative Contractors. We have ongoing conversations with third-party payors to advocate for appropriate coding, coverage and payment for our portfolio of products.

Medicare Outpatient TPT Status

Part B of the Medicare program generally reimburses medical services and supplies, including drugs, provided to beneficiaries by physicians and other qualified healthcare professionals. Generally, drugs furnished “incident to” a physician’s service in the hospital outpatient setting of care are reimbursed at ASP plus a certain additional percent, unless the product is treated as a “supply” in the performance of the procedure and “packaged” and paid as part of bundled payment for the procedure. New drugs, however, may apply for TPT Status in which case they are provided a separate payment at ASP plus a certain additional percent for two to three years, regardless of whether they would ordinarily be packaged. TPT Status applies to patients with traditional Medicare FFS insurance coverage who are treated in the hospital outpatient setting. Since 2008, under the hospital outpatient program, diagnostic radiopharmaceuticals have been considered supplies and their payment bundled into the payment for the procedure after expiration of TPT Status. In November 2024, CMS released the CMS 2025 OPPS Rule to pay separately for diagnostic radiopharmaceuticals, such as PYLARIFY, with a per day cost greater than $630, based on their MUC. In November 2025, the CMS 2026 OPPS Rule updated this per day cost threshold to $655, with payment based on the arithmetic

MUC. MUC differs from ASP as it is an indirect measure of a product’s cost based on hospital-reported claims data. We believe MUC is a less accurate reflection of actual purchasing costs of the hospital.

PYLARIFY’s TPT Status from CMS in the hospital outpatient setting was effective from January 1, 2022 through December 31, 2024, enabling traditional Medicare FFS to provide separate payment for PYLARIFY in addition to the payment for the PET/computed tomography procedure in that setting. Effective January 1, 2025, CMS began maintaining separate payment for PYLARIFY based on MUC in the hospital outpatient setting, which is lower than payments based on ASP that were made during TPT Status. Although PYLARIFY continues to be paid separately, other competitive PSMA PET imaging agents continue to have TPT Status after December 31, 2024, and hospital use of those products, for patients with traditional Medicare FFS in the hospital outpatient setting, generally will be paid separately based on ASP plus six percent rather than on MUC. In November 2025, in the preamble to the CMS 2026 OPPS Rule, CMS acknowledged that there could be value in the use of ASP for determining separately paid diagnostic radiopharmaceutical payment amounts in the future. However, CMS will continue to use the arithmetic MUC to calculate payment for diagnostic radiopharmaceuticals in 2026, explaining that there must be more consistent, validated, and universal reporting of ASP data for diagnostic radiopharmaceuticals before ASP can be the basis for payment. CMS reiterated in the CMS 2026 OPPS Rule that, although ASP reporting for diagnostic radiopharmaceuticals remains voluntary at this time, it will continue to evaluate whether and how ASP could be used for future Medicare Outpatient Prospective Payment System (“OPPS”) payment once reporting is sufficiently consistent, validated, and universal.

Similarly, when used for patients in the hospital outpatient setting, Neuraceq is paid based on its MUC, however, other competitive imaging agents are currently being paid based on a higher MUC rate.

We have repeatedly engaged CMS on methodology for reporting ASP, and we will continue to work with coalition partners and CMS to support using ASP rather than MUC to calculate payment for diagnostic radiopharmaceuticals, including PYLARIFY and Neuraceq, in future years similar to the way OPPS currently pays for other drugs, biologics, and therapeutic radiopharmaceuticals.

Healthcare Reform and Other Laws Affecting Payment

We operate in a highly regulated industry. The U.S. and state governments continue to propose and pass legislation that may affect the availability and cost of healthcare. For example, the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act (collectively, the “Healthcare Reform Act”), substantially changed the way in which healthcare is financed by both governmental and private insurers and has a significant impact on the pharmaceutical industry. The Healthcare Reform Act contains a number of provisions that affect coverage, reimbursement and/or delivery of drug products and the medical imaging procedures in which our drug products are used.

The Healthcare Reform Act has been subject to political and judicial challenges, but it has generally withstood such challenges, and the main provisions of the Healthcare Reform Act remain in effect. More recently, Congress enacted the Inflation Reduction Act of 2022 (the “IRA”) which significantly impacts the pharmaceutical industry. Among other provisions, the IRA authorizes Medicare to negotiate pricing for the highest Medicare-spend drugs, as determined by their Medicare Part B and D spend, that have been on the market for an extended period of time without market competition. Although the IRA provides for a limited number of categorical exclusions from Medicare negotiation, radiopharmaceuticals are not among those categorical exclusions. CMS is implementing the first year of Medicare negotiation, which will be restricted to Part D drugs, starting in calendar years 2026 and 2027. In addition, the statute provided for redesign of the Medicare Part D benefit. We are currently focused on drugs that are covered under Part B, therefore we do not expect the Part D benefit redesign to have an impact on our portfolio. Part B drugs will be considered for Medicare negotiation beginning in calendar year 2028, and CMS will begin the process of identifying Part B drugs for negotiation as early as calendar year 2026. We are monitoring the implementation of the IRA to determine what impact, if any, this would have on our current products and product candidates in development.

The IRA also introduces rebate obligations for manufacturers of Part B and D drugs that take price increases which exceed the rate of inflation, similar to the longstanding Medicaid inflation rebates. Under these new Medicare inflation rebates, each Part B and D single-source drug/biological and biosimilar will have an “inflation adjusted” payment amount calculated by CMS. If the manufacturer’s price increases for the relevant product exceeds the inflation adjusted payment amount, as trended forward by the rate of inflation, the manufacturer will be required to reimburse Medicare the difference between what Medicare paid for the product and what it would have paid based on the inflation adjusted payment amount.

Recent state legislative efforts seek to address drug costs and generally have focused on increasing transparency around drug costs or limiting drug prices. Some of those efforts have been subject to legal challenge.

General legislative cost control measures may also affect reimbursement for our products (or services provided by healthcare providers using our products). The Budget Control Act, as amended by the Bipartisan Budget Act of 2019, resulted in the imposition of 2% reductions in Medicare (but not Medicaid) payments to providers beginning in 2013 and will remain in effect through fiscal year 2030 unless additional Congressional action is taken. The imposition of the 2% payment adjustment had been suspended through March 31, 2022 and went into effect as of April 1, 2022. Any significant spending reductions affecting Medicare, Medicaid or other publicly funded or subsidized health programs that may be implemented and/or any significant taxes or fees that may be imposed on us could have an adverse impact on our business results of operations, financial condition and cash flows.

On July 4, 2025, President Trump signed into law the largest changes to the Healthcare Reform Act with the One Big Beautiful Bill Act (the “OBBBA”), which will reduce existing patient coverage under Medicaid. The expiration of certain subsidies for Marketplace coverage currently in place under the Healthcare Reform Act at the end of 2025 may also cause material coverage losses. The OBBBA further restricts Medicaid financing, which will decrease federal funds available to state Medicaid agencies and may result in reduced state Medicaid agency reimbursement rates.

Additionally, changes in U.S. drug pricing policies, including initiatives that seek to link domestic prices to those paid in other countries under “most‑favored‑nation” pricing concepts, could increase pricing pressure on our products. Any such policies, if implemented or expanded, could reduce reimbursement levels, constrain pricing flexibility, and adversely affect our revenues and results of operations.

Healthcare Fraud and Abuse Laws

We are subject to various federal, state and local laws targeting fraud and abuse in the healthcare industry, including anti-kickback and false claims laws. Violations of fraud and abuse laws may be punishable by criminal or civil sanctions, including fines and civil monetary penalties, and/or exclusion from federal health care programs (including Medicare and Medicaid). Federal and state authorities are paying increased attention to enforcement of these laws within the pharmaceutical industry, and private individuals have been active in alleging violations of the laws and bringing suits on behalf of the government under the federal False Claims Act (“FCA”). Violations of international fraud and abuse laws could result in similar penalties, including exclusion from participation in health programs outside the United States. If we were subject to allegations concerning, or were convicted of violating, these laws, our business could be harmed.

The federal Anti-Kickback Statute generally prohibits, among other things, a pharmaceutical manufacturer from directly or indirectly soliciting, offering, receiving, or paying any remuneration in cash or in kind where one purpose is either to induce the referral of an individual for, or the purchase or prescription of a particular drug that is payable by a federal health care program, including Medicare or Medicaid. The Healthcare Reform Act clarifies the intent requirements of the federal Anti-Kickback Statute, providing that a person or entity does not need to have actual knowledge of the statute or a specific intent to violate the statute. Violations of the federal Anti-Kickback Statute can result in exclusion from Medicare, Medicaid or other governmental programs, as well as civil and criminal fines and penalties for each violation and three times the amount of the unlawful remuneration. In addition, the Healthcare Reform Act revised the FCA to provide that a claim arising from a violation of the Federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the FCA. The majority of states also have anti-kickback, false claims, and similar fraud and abuse laws and although the specific provisions of these laws vary, their scope is generally broad, and there may not be regulations, guidance or court decisions that apply the laws to particular industry practices. There is, therefore, a possibility that our practices might be challenged under the anti-kickback statutes or similar laws.

Federal and state false claims laws generally prohibit anyone from knowingly and willfully, among other activities, presenting, or causing to be presented for payment to third party payors (including Medicare and Medicaid) claims for drugs or services that are false or fraudulent (which may include claims for services not provided as claimed or claims for medically unnecessary services). As discussed, a claim arising from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the FCA. False or fraudulent claims for purposes of the FCA carry fines and civil penalties for violations for each false claim, plus up to three times the amount of damages sustained by the federal government and, most critically, may provide the basis for exclusion from federally funded healthcare programs. There is also a criminal FCA statute by which individuals or entities that submit false claims can face criminal penalties. In addition, under the federal Civil Monetary Penalty Law, the Department of Health and Human Services Office of Inspector General has the authority to exclude from participation in federal health care programs or to impose civil penalties against any person who, among other things, knowingly presents, or causes to be presented, certain false or otherwise improper claims. Our activities relating to the sale and marketing of our products may be subject to scrutiny under these laws and any violation could create a substantial liability for us and also cause reputational harm.

Laws and regulations have also been enacted by the U.S. federal government and various states, as well as by countries outside of the United States, to regulate the sales and marketing practices of certain entities including pharmaceutical and device manufacturers. The laws and regulations generally limit financial interactions between manufacturers and health care providers; require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the U.S. federal government; and/or require disclosure by pharmaceutical and device manufacturers to the government and/or public of financial interactions or other financial relationships with health care providers and other entities such as teaching hospitals (so-called “sunshine laws”). The Healthcare Reform Act requires manufacturers to submit information to the FDA on the identity and quantity of drug samples requested and distributed by a manufacturer during each year. Many of these laws and regulations contain ambiguous requirements or require administrative guidance for implementation. The laws and regulations include requirements that can be unclear in their scope, nature, and required implementation by regulated entities. If we fail to comply with such laws and regulations, in the United States or in countries outside the United States, we could be subject to penalties and administrative actions under such laws and regulations.

Data Privacy, Security and Breach Notification

We are subject to data protection and privacy laws and regulations that set forth data privacy, security, and breach notification requirements. The legislative and regulatory landscape for data protection continues to evolve, and in recent years there has been an increasing focus on data protection and other data privacy and security issues. Data protection and privacy laws and regulations can be complex and are becoming more stringent over time. In the United States, numerous federal and state laws and regulations, including state data breach notification laws, state health information privacy laws and federal and state consumer protection laws govern the collection, use, disclosure and protection of health-related and other personal information. In addition to establishing restrictions on how personal information may be collected, used, and disclosed, these laws and regulations provide various rights to data subjects with respect to their personal information and establish requirements for how personal information must be secured. In addition, every state in the United States now has a data breach notification law that requires regulated entities to report certain security breaches to affected data subjects, regulators, or other entities. Failure to comply with data protection and privacy laws and regulations could result in government enforcement actions (which could include civil or criminal penalties and requirements to take corrective actions), private litigation (which may result in the award of damages against us), and/or adverse publicity, and could negatively affect our operating results, business, and reputation. In addition, we may obtain health information from third parties (e.g., healthcare providers who prescribe our products) that are themselves subject to privacy, security, and breach notification requirements under the Health Insurance Portability and Accountability Act of 1996, as amended by the Health Information Technology for Economic and Clinical Health Act (collectively, “HIPAA”). While we believe that we are neither a “covered entity” nor “business associate” subject directly to regulation under HIPAA, HIPAA’s criminal provisions can apply to entities other than “covered entities” or “business associates” in certain circumstances. Accordingly, we could be subject to criminal penalties if we knowingly obtain or disclose individually identifiable health information from a HIPAA-covered entity in a manner that is not authorized or permitted.

In addition, a growing number of jurisdictions outside of the United States have enacted robust data protection and privacy laws. Certain of these laws have extraterritorial application. For example, the processing of personal data in the European Union is governed by the provisions of the General Data Protection Regulation, or GDPR, which came into effect on May 25, 2018. The GDPR applies to an entity established in the European Economic Area (“EEA”) and extraterritorially to an entity outside of the EEA that offers goods or services to, or monitors the behavior of, individuals located in the EEA. Certain “special categories” of personal data, including data concerning health, are subject to enhanced protections under the GDPR. This regulation imposes several requirements on the controllers and processors of personal data, including the obligation to comply with various rights that individuals have with respect to their personal data and restrictions on the processing of personal data, and to provide notice of data processing obligations to the competent national data protection authorities. The GDPR also imposes strict rules on the transfer of personal data out of the EEA to the United States. Failure to comply with the requirements of the GDPR and the related national data protection laws of the European Economic Area Member States may result in significant fines and other administrative penalties.

In the United States, several state legislatures are considering enacting or have enacted new data privacy legislation. Such examples of legislation that have been passed are the California Consumer Privacy Act (“CCPA”) and the California Privacy Rights Act (“CPRA”), which imposes many requirements on certain for-profit businesses that process the personal information of California residents. Many of the CCPA’s requirements are similar to those found in the GDPR, including requiring businesses to provide notice to data subjects regarding the information collected about them and how such information is used and shared, and providing data subjects various rights, such as the right to request access to their personal information and, in certain cases, request the erasure of such personal information. The CCPA also affords California residents the right to opt-out of the “sale” of their personal information. In addition, the CCPA requires regulated businesses to implement reasonable security procedures and practices to protect personal information. The CCPA contains significant penalties for companies that violate its requirements. It also provides California residents a private right of action, including the ability to seek statutory damages, in the event of a breach involving their personal information resulting from a business’s failure to implement and maintain reasonable security procedures and practices. Compliance with the CCPA, CPRA, and similar laws implemented in other states, is a rigorous and time-intensive process that may increase the cost of doing business or require companies to change their business practices to ensure full compliance.

Antitrust and Competition Laws

The federal government and most states have enacted antitrust laws that prohibit specific types of anti-competitive conduct, including price fixing, wage fixing, concerted refusals to deal, price discrimination and tying arrangements, as well as monopolization and acquisitions of competitors that have, or may have, a substantial adverse effect on competition. Violations of federal or state antitrust laws can result in various sanctions, including criminal and civil penalties. We believe we are in compliance with such federal and state laws, but courts or regulatory authorities may reach a determination in the future that could adversely affect our business, results of operations, financial condition and cash flows. In addition, we are subject to similar

antitrust and anti-competition laws in foreign countries. We believe we are in compliance with such laws, however, any violation could create a substantial liability for us and also cause reputational harm in both foreign and domestic markets.

Laws Relating to Foreign Trade

We are subject to various federal and foreign laws that govern our international business practices with respect to payments to government officials. Those laws include the Foreign Corrupt Practices Act (“FCPA”) which prohibits U.S. companies and their representatives from paying, offering to pay, promising, or authorizing the payment of anything of value to any foreign government official, government staff member, political party, or political candidate for the purpose of obtaining or retaining business or to otherwise obtain favorable treatment or influence a person working in an official capacity. In many countries, the healthcare professionals we regularly interact with may meet the FCPA’s definition of a foreign government official. The FCPA also requires public companies to make and keep books and records that accurately and fairly reflect their transactions and to devise and maintain an adequate system of internal accounting controls. Companies that violate the FCPA can be subject to substantial monetary penalties and post-resolution compliance reporting obligations to the government. In addition, the costs associated with an FCPA investigation can be substantial.

Those laws also include the U.K. Bribery Act (“Bribery Act”) which proscribes giving and receiving bribes in the public and private sectors, bribing a foreign public official, and failing to have adequate procedures to prevent employees and other agents from giving bribes. U.S. companies that conduct business in the United Kingdom generally will be subject to the Bribery Act. Penalties under the Bribery Act include potentially unlimited fines for companies and criminal sanctions for corporate officers under certain circumstances.

Our policies mandate compliance with all anti-bribery laws. Our operations reach many parts of the world that have experienced governmental corruption to some degree, and in certain circumstances compliance with anti-bribery laws may conflict with local customs and practices. Despite our training and compliance programs, our internal control policies and procedures may not always protect us from criminal acts committed by our employees or agents.

We are also subject to trade control regulations and trade sanctions laws that restrict or prohibit the movement of certain goods, currency, products, materials, software, services and technology to, and certain operations in, various countries or with certain persons. Our ability to transfer people and products among certain countries may be subjected to these laws and regulations.

Health and Safety Laws

We are also subject to various federal, state and local laws, regulations and recommendations, both in the United States and abroad, relating to safe working conditions, laboratory and manufacturing practices and the use, transportation and disposal of hazardous or potentially hazardous substances.

See Part I, Item 1A. “Risk Factors” of this Form 10-K for information regarding certain risks related to reimbursement and regulation.

Environmental Matters

We are subject to various federal, state and local laws and regulations relating to the protection of the environment, human health and safety in the United States, and in other jurisdictions in which we operate. Our operations, like those of other radiopharmaceutical companies, involve the transport, use, handling, storage, exposure to and disposal of materials and wastes regulated under environmental laws, including hazardous and radioactive materials and wastes. If we violate these laws and regulations, we could be fined, criminally charged or otherwise sanctioned by regulators. We believe that our operations currently comply in all material respects with applicable environmental laws and regulations.

Certain environmental laws and regulations assess liability on current or previous owners or operators of real property for the cost of investigation, removal or remediation of hazardous materials or wastes at those formerly owned or operated properties or at third party properties at which they have disposed of hazardous materials or wastes. In addition to cleanup actions brought by governmental authorities, private parties could bring personal injury, property damage or other claims due to the presence of, or exposure to, hazardous materials or wastes. We currently are not party to any claims or any obligations to investigate or remediate any material contamination at any of our facilities, however, if we were found to be liable under one or more of these laws or regulations, it could create a substantial liability.

We are required to maintain a number of environmental permits and nuclear licenses for our North Billerica campus, which includes our primary manufacturing, packaging and distribution facility. In particular, we must maintain a nuclear byproducts materials license issued by the Commonwealth of Massachusetts. This license requires that we provide financial assurance demonstrating our ability to cover the cost of decommissioning and decontaminating (“D&D”) the North Billerica site at the end of its use as a nuclear facility. We store low level radioactive waste at our facilities until the materials are below regulatory limits, as allowed by our licenses and permits. As of December 31, 2025, we estimate the D&D cost of all of our manufacturing sites to be approximately $20.4 million. As of December 31, 2025 and 2024, we have a liability of approximately $0.1 million and $23.3 million, respectively associated with our asset retirement obligations. The liability for the decommissioning obligation reflects that, in 2025, $17.5 million was reclassified to liabilities held for sale as a result of the sale of the assets and liabilities associated with the Company’s SPECT business, which was completed on January 1, 2026 (see Note 8 “Assets and Liabilities Held for Sale” to our consolidated financial statements included in Part II, Item 8 “Financial Statements and Supplementary Data” of this Form 10-K. We currently provide this financial assurance in the form of a surety bond.

We also actively monitor and seek to reduce our solid waste, energy and water usage, wastewater discharge and greenhouse gas emissions. We generally contract with third parties for the disposal of waste generated by our operations. In 2020, we developed a stormwater management operations and maintenance plan to minimize stormwater pollution from high impact activities. Improvements we made include (i) the regular inspection and cleaning of catch basins and piping to reduce sediment and debris wash out to adjacent wetlands; (ii) increasing street and parking lot cleaning to reduce pollutant run off; (iii) updating our snow removal plan at our North Billerica campus to reduce the impact to adjacent wetlands; and (iv) using salt brine as a pretreatment for winter storms to reduce the amount of salt use and run off.

With respect to sustainability, we track and monitor our energy use, water generation and a limited scope of greenhouse gas emissions. Since 2022, we have powered our North Billerica campus with renewable wind energy through a contract with National Grid.

We use third-party environmental software to track available environmental data fields and in 2024 expanded our scope to include data for all of our locations. The implementation of this software rapidly improved our efficiency in data collection and reporting. To drive continuous improvement, we compare our usage data against prior annual baselines, national medians, and similar businesses.

Environmental laws and regulations are complex, change frequently and have become more stringent over time. While we have budgeted for future capital and operating expenditures to maintain compliance with these laws and regulations, we cannot assure you that our costs of complying with current or future environmental protection, health and safety laws and regulations will not exceed our estimates or adversely affect our results of operations and financial condition. Further, we cannot assure you that we will not be subject to additional environmental claims for personal injury or cleanup in the future based on our past, present or future business activities. While it is not feasible to predict the future costs of ongoing environmental compliance, it is possible that there will be a need for future provisions for environmental costs that, in management’s opinion, are not likely to have a material effect on our financial condition, but could be material to the results of operations in any one accounting period.

See Part I, Item 1A. “Risk Factors” of this Form 10-K for information regarding certain risks associated with environmental matters.

Human Capital Management

As of December 31, 2025, we had 1,193 employees, of which 1,056 were located in the United States and 137 were located internationally. None of our employees are represented by a collective bargaining agreement, and we believe that our relationship with our employees is good.

Inclusion, Ethics and Compliance

We believe that supporting our local community and instilling an inclusive, ethical and compliant culture makes us an employer of choice, allows us to maintain good standing with our employees, the regulatory authorities and our customers, and benefits our stockholders in the long run.

Five of ten of the directors on our Board, including our Chairperson, are women, and 45% of our senior leaders, holding the position of Vice President or above self-identify as women. Approximately 43% of our employees self-identify as women. We continue to strive to improve our inclusion beyond gender, and we require recruiters working with us to present an inclusive candidate slate for posted positions as we believe that we benefit from having a skilled team with a diversity of viewpoints, backgrounds and experiences.

We are committed to promoting a culture of ethics and compliance. Our Code of Conduct and Ethics reflects our commitment to corporate integrity and the underlying business practices and principles of behavior that support this commitment. Each year our employees complete mandatory training that includes anti-bribery/anti-corruption rules, insider trading prohibitions, confidentiality obligations, as well as specialized training in healthcare industry marketing practices among other things. We have a formal Ethics and Compliance Committee that develops, implements and oversees our ethics and compliance programs. We also have a Supplier Code of Conduct, and we seek to do business with minority-owned, female-owned and other inclusive businesses and organizations (including those owned or operated by veterans and disabled veterans) that appropriately reflect the communities in which we operate and the customer base we serve, equip us with a deeper understanding of challenges impacting our communities and customers, and enable us to provide more innovative solutions and better outcomes.

Compensation and Benefits

We seek to provide pay, benefits, and services that are competitive to market and create incentives to attract and retain employees. Our compensation package includes, among other things, market-competitive pay, cash bonuses, healthcare and defined contribution plan benefits, paid time off and family leave, and, to certain levels of employees, restricted stock and other equity grants, as well as the option to participate in our nonqualified deferred compensation plan. We are focused on pay equity and regularly assess pay among similar roles and responsibilities throughout our organization and in comparison to our peer group.

Communication and Engagement

We believe that our success depends on employees understanding how their work contributes to our overall strategy. To this end, we utilize a variety of channels to facilitate open and direct communication, including: (i) quarterly town hall meetings for our entire company; (ii) regular ongoing update communications, including through monthly newsletters and our intranet site; and (iii) an externally administered whistleblower hotline and website that is prominently advertised to our employees, and a whistleblower’s anonymity is protected, if so requested. We also established various employee recognition award programs to recognize and reward employees for specific outstanding accomplishments and to foster a positive employee relations climate.

Health, Wellness and Safety

We are committed to the health and safety of our employees, patients and other partners in the healthcare community. We work to promote an environment of awareness and shared responsibility for safety and regulatory compliance throughout the Company, in order to minimize risks of injury, exposure, or business impact.

Corporate History

Founded in 1956 as New England Nuclear Corporation, our medical imaging diagnostic business was purchased by E.I. du Pont de Nemours and Company (“DuPont”) in 1981. Bristol Myers Squibb (“BMS”) subsequently acquired our diagnostic medical imaging business as part of its acquisition of DuPont Pharmaceuticals in 2001. In January 2008, Avista Capital Partners, L.P., Avista Capital Partners (Offshore), L.P. and ACP-Lantern Co-Invest, LLC formed Lantheus Holdings and acquired our medical imaging business from BMS. On June 30, 2015, we completed an initial public offering of our common stock. Our common stock is traded on the NASDAQ Global Market under the symbol “LNTH”.

Available Information

Our global Internet site is www.lantheus.com. We routinely make available important information, including copies of our Form 10-K, Quarterly Reports on Form 10-Q (“Form 10-Q”), Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after those reports are electronically filed with, or furnished to, the Securities and Exchange Commission (“SEC”), free of charge on our website at investor.lantheus.com. We recognize our website as a key channel of distribution to reach public investors and as a means of disclosing material non-public information to comply with our disclosure obligations under SEC Regulation FD. Information contained on our website shall not be deemed incorporated into, or to be part of this Form 10-K, and any website references are not intended to be made through active hyperlinks.

Our reports filed with, or furnished to, the SEC are also available on the SEC’s website at www.sec.gov, and for Form 10-K and Form 10-Q, in an Inline Extensible Business Reporting Language (“iXBRL”) format. iXBRL is an electronic coding language used to create interactive financial statement data over the Internet.

Item 1A. Risk Factors

You should carefully consider the following risks. The risks and uncertainties described below are not the only ones we face. Additional risks and uncertainties that we are unaware of, or that we currently believe are not material, may also become important factors that adversely affect our business. These risks could materially affect our business, results of operations or financial condition, cause the trading price of our outstanding common stock to decline materially or cause our actual results to differ materially from those expected or those expressed in any forward-looking statements made by us or on our behalf. See “Cautionary Note Regarding Forward-Looking Statements” and the risks of our businesses described elsewhere in this Annual Report on Form 10‑K (“Form 10-K”).

Risks Related to Our Portfolio of Commercial Products

Continued substantial revenue contribution from PYLARIFY is dependent on (A) the ability of positron emission tomography (“PET”) manufacturing facilities (“PMFs”) to manufacture PYLARIFY to meet product demand, including ensuring that PYLARIFY is available at the specific time of day preferred by the end-user, (B) our ability to ensure adequate coding, coverage and payment for PYLARIFY, (C) our ability to promote PYLARIFY to customers and to maintain PYLARIFY as a widely utilized prostate-specific membrane antigen (“PSMA”) PET imaging agent, which has been impacted by the expiration of transitional pass-through payment status (“TPT Status”) on December 31, 2024, (D) whether and when a potential generic version of PYLARIFY may enter the market and (E) our ability to clinically and commercially differentiate PYLARIFY from competitive products.

To manufacture PYLARIFY, we assembled and qualified a nationwide network of PMFs with radioisotope-producing cyclotrons that make F-18, which has a 110-minute half-life, so PYLARIFY is manufactured and distributed rapidly to end-users. Because each of the PMFs manufacturing these products is deemed by the U.S. Food and Drug Administration (“FDA”) to be a separate manufacturing site, each has to be separately approved by the FDA. Although PYLARIFY is broadly available across the United States, we will continue to seek qualification for additional PMFs in 2026 and can give no assurance that additional PMF sites will have the capacity to produce PYLARIFY in addition to other products they may already produce, including other F-18-based products, that those PMF sites will be willing to commit to manufacture PYLARIFY and successfully complete the technology transfer process necessary to manufacture PYLARIFY, that the FDA will continue to approve PMFs in accordance with our expansion plans to meet product demand, that PYLARIFY will be available at the specific time of day preferred by the end-users or that our expansion plans accurately predict demand growth. To the extent that PYLARIFY is not available at preferred times or the reimbursement economics for PYLARIFY are no longer favorable, end users have, in some instances, switched all or a portion of their use to available competitive products. If FDA approval of manufacturing sites is delayed or withdrawn or if FDA requirements relating to site approval change impacting our ability to meet demand for PYLARIFY or end users scheduling needs or if we invest to extend our PMF network and demand does not grow to meet the expanded capacity, our business, results of operations, financial condition and cash flows would be adversely affected.

Ensuring adequate coding, coverage, and payment for PYLARIFY is critical, including not only coverage from Medicare, Medicaid and other government payors, as well as private payors, but also appropriate payment levels to adequately cover our customers’ costs of using PYLARIFY in PET/computed tomography (“CT”) imaging procedures. The Healthcare Procedure Coding System code for PYLARIFY, which enables streamlined billing, went into effect as of January 1, 2022. PYLARIFY also had TPT Status from January 1, 2022 until December 31, 2024, which enabled traditional Medicare to provide an incremental payment for PET/CT scans performed with PYLARIFY in the hospital outpatient setting. After expiry of TPT Status, diagnostic radiopharmaceuticals, such as, PYLARIFY, historically would not have been separately reimbursed in the hospital outpatient setting but rather would be bundled into the facility payment a hospital receives for a PET/CT imaging procedure, and the facility payment may not have adequately covered the total cost of the procedure with the diagnostic radiopharmaceutical for all hospitals. In November 2024, the Centers for Medicare & Medicaid Services (“CMS”) released the final rule for its calendar year 2025 Medicare Hospital Outpatient Prospective Payment System (the “CMS 2025 OPPS Rule”). The CMS 2025 OPPS Rule became effective on January 1, 2025, pursuant to which previously packaged diagnostic radiopharmaceuticals were “unbundled” with payments being made separately for any diagnostic radiopharmaceutical with a per day cost greater than $630 based on their mean unit cost (“MUC”). In November 2025, CMS released the final rule for its calendar year 2026 Medicare Hospital Outpatient Prospective Payment System, which continues to provide for separate payment for diagnostic radiopharmaceuticals with per day costs greater than $655 based on their MUC. While these changes enable hospitals that use innovative diagnostic radiopharmaceuticals, including PYLARIFY, to continue to be paid separately by CMS following the expiry of TPT Status, that payment is made at a rate that reflects MUC. As a result, as of January 1, 2025, the payment rate for PYLARIFY is based on MUC and is less than the Average Sales Price (“ASP”)-based amount that was paid during TPT Status. Although PYLARIFY continues to be paid separately, other competitive PSMA PET imaging agents continue to have TPT Status after December 31, 2024, including a new PSMA PET imaging agent with TPT Status effective on October 1, 2025, and hospital use of those products, for patients with traditional Medicare fee-for-service (“FFS”) in the hospital outpatient setting, generally will be paid separately based on ASP plus six percent rather than on MUC, which provides a financial incentive to use an imaging agent other than PYLARIFY. We have reported and continue to report ASP for PYLARIFY, have engaged with CMS on the methodology for reporting ASP, and we will continue to work with coalition partners and CMS to support using ASP rather than MUC to calculate payment for diagnostic radiopharmaceuticals in future years similar to the way Medicare Outpatient Prospective Payment System (“OPPS”) currently pays for other drugs, biologics, and therapeutic radiopharmaceuticals. However, we can give

no assurances that we will be successful in those efforts or that the availability of TPT Status for other diagnostic radiopharmaceuticals will not continue to impact clinical decision making regarding which product to use for all patient populations, which could have an adverse effect on our business, results of operations, financial condition and cash flows.

Continued substantial revenue contribution from PYLARIFY is also dependent on our ability to promote PYLARIFY to customers, to clinically and commercially differentiate PYLARIFY from other products on the market, to enter into and realize the benefits of strategic contracts with customers and to maintain PYLARIFY as a widely utilized PSMA PET imaging agent in an increasingly competitive environment in which other PSMA PET imaging agents have been approved, for which discounts related to those other agents have been offered to customers and for which TPT Status may be available. PYLARIFY currently competes with three commercially available Gallium-68-based PSMA PET imaging agents, two from Telix Pharmaceuticals Limited and one from Novartis AG and an F-18 PSMA PET imaging agent from Blue Earth Diagnostics Ltd. (“Blue Earth”), as well as other non-PSMA PET imaging agents. The potential for future generic entrants to the market due to the expiry of PYLARIFY’s new chemical entity exclusivity period in 2026 could also generate increased competition for PYLARIFY. Substantial revenue contribution from PYLARIFY will also depend on our ability to clinically differentiate PYLARIFY from competitive products so that customers continue to choose PSMA PET with PYLARIFY for appropriate patients because of its clinical differentiation and despite the loss of TPT Status, including through flexible and dependable access to PYLARIFY nationally, a best-in-class customer experience and continued promotion and education regarding PYLARIFY’s clinical and commercial attributes. Our ability to negotiate and realize the benefits from strategic contracts is also key to our ability to maintain and expand market share. Despite these efforts, we have seen net price compression and lost market share to certain competitors that have later approved products with TPT Status at a time when PYLARIFY’s TPT Status has expired or that have offered rebates to customers, and we may experience further net price compression or lose market share to these or future competitive products due to reimbursement status, new clinical data that may emerge, the impact of any potential generic entrant to the market or the potential that additional rebates may be offered to customers, including when a PSMA PET imaging agent is purchased as one part of a broader portfolio of products. Such loss of market share could have an adverse impact on our business, results of operations, financial condition and cash flows.

Our success in continuing to generate substantial revenue from PYLARIFY also depends, in part, on our successfully establishing the use of PYLARIFY for new patient populations, such as patients with favorable intermediate-risk prostate cancer, and potentially for updates to the label, including for patient selection for PSMA-targeted therapeutics. For example, we are conducting a clinical trial to determine whether PYLARIFY can detect the presence or absence of additional prostate cancer lesions in patients with favorable intermediate-risk prostate cancer, as well as how it may change the patient’s intended management, but cannot predict whether the outcome of this clinical trial will support such a use of PYLARIFY. Similarly, we believe the approval of PLUVICTO for the treatment of adults with PSMA-positive metastatic castration-resistant prostate cancer created a new addressable market for the use of PSMA PET imaging in patient selection for PSMA-targeted therapy. We can give no assurances as to how current clinical practice may evolve. To the extent we are unsuccessful in establishing the use of PYLARIFY in new patient populations, such lack of success could have an adverse impact on our business, results of operations, financial condition and cash flows.

We depend on some of our PMF partners to generate sales, accept, produce and deliver orders, collect payments and report related information for PYLARIFY.

PYLARIFY is sold in the United States to hospitals, independent imaging centers and government facilities and sales are generated through an internal PYLARIFY sales team, as well as sales teams at some of our PMF partners. We generally do not use group purchasing arrangements to sell PYLARIFY and require each customer to enter into a contract directly with us or our PMF partners. Our ability to continue to receive substantial revenue contribution from PYLARIFY depends, in part, on our ability, and the ability of some of our PMF partners on our behalf, to continue to enter into commercially beneficial arrangements directly with the hospitals, independent imaging centers and government facilities that we serve. Any delay or inability to enter into these arrangements, including our ability to negotiate favorable financial terms in these agreements, or if, despite favorable financial terms, the customers do not continue to purchase PYLARIFY, could have an adverse impact on our business, results of operations, financial condition and cash flows.

We also depend on some of our PMF partners to accept, produce and deliver orders, invoice customers, collect payments and to report related information to us. To the extent our PMF partners are unsuccessful in generating sales, accepting, producing and delivering orders, invoicing customers, collecting payments or reporting to us, or where we are responsible, if we are unsuccessful in accepting orders, ensuring timely production and delivery of those orders by a PMF, or if invoices to customers or collection of payments is delayed, such an event could have a material adverse effect on our business, results of operations, financial condition and cash flows. We are in the process of transitioning responsibility for invoicing certain customers from a PMF partner to the Company. This transition includes potential risks, including risks from a disruption during the transition or our inability to seamlessly move from one invoicing system to the other. The transition will also require our customers to take certain actions to transition from the PMF to the Company when paying invoices which is out of our control. These risks, and other potential risks that we may not have accounted for as part of our transition planning, could result in delayed or inaccurate invoicing, loss of revenue, loss of customers or reputational harm which could have an adverse impact on our business, results of operations, financial condition and cash flows.

We and our PMF partners also use third-party software to accept orders placed by customers and to record shipping and administrative status of orders. We rely in part on information from third-party software and from our PMF partners in connection with how we report and collect payments for PYLARIFY. To the extent we are unable to accept orders or access, verify or reconcile data, such event could have a material adverse effect on our business, results of operations, financial condition and cash flows.

Potential generic competitors may seek to enter the market as a result of regulatory exclusivity expiration, including the expiry of NCE regulatory exclusivity for PYLARIFY in May 2026.

Following the expiration of regulatory exclusivity, we may face increased competition from generic products, including through abbreviated approval pathways under the Hatch‑Waxman Act or as a result of actions brought under the CREATES Act. The likelihood of entry or anticipated entry of such competing products cannot be predicted and could significantly reduce demand for our products, pressure pricing and reimbursement, and adversely affect our business, results of operations, and financial condition.

PYLARIFY currently has six patents listed in the FDA’s publication, “Approved Drug Products with Therapeutic Equivalence Evaluations” (the Orange Book”), the last of which expires in 2037. PYLARIFY also holds a five-year new chemical entity (“NCE”) regulatory exclusivity, which expires on May 26, 2026. As described further under Part I, Item 1., “Business - Regulatory Matters-Hatch Waxman Act,” of this Form 10-K, the FDA is allowed to accept an Abbreviated New Drug Application (“ANDA”) or 505(b)(2) application one year prior to the NCE expiration date under certain circumstances, specifically, from a generic challenger that includes a “Paragraph IV” Certification against each of the six patents we have listed in the Orange Book. If a Paragraph IV Certification is made, we could elect to pursue Hatch-Waxman litigation and trigger the 30-month stay described under Part I, Item 1., “Business - Intellectual Property Matters – Patent-related Aspects of Regulatory Matters,” of this Form 10-K, during which period the FDA would be prohibited from granting full approval to the challenger’s application. As of the date of filing of this Form 10-K, we have not received any notice of a Paragraph IV Certification, but we can give no assurance that we will not receive notice of a Paragraph IV Certification in the future. If an ANDA or 505(b)(2) applicant were to file prior to the expiration of our NCE regulatory exclusivity, and we were to timely sue pursuant to the Hatch-Waxman Act, then the automatic stay of FDA approval could run until November 26, 2028, calculated as 30 months from the NCE expiration date (May 26, 2026), unless prior to such date the generic challenger successfully invalidates or proves non-infringement of all six Orange Book-listed patents or the lawsuit is otherwise settled. If litigation is ongoing in November 2028, then any generic launch would be at risk of the litigation determining that the generic challenger was infringing one or more of our patents. Patent litigation is complex and can be protracted and expensive, so if we were to receive such a notice and to challenge the applicant, this could have a negative effect on our business, results of operations and financial condition.

If we are unable to grow the appropriate use of DEFINITY in suboptimal echocardiograms in the face of competition from other existing echocardiography agents and potential generic competitors as a result of patent and regulatory exclusivity expirations or maintain its position as the most utilized ultrasound enhancing agent.

The growth of our business is also dependent on our ability to continue to grow the appropriate use of DEFINITY in suboptimal echocardiograms. DEFINITY currently competes with ultrasound enhancing agents produced by GE HealthCare Limited (“GE Healthcare”) and Bracco Diagnostics Inc. (“Bracco”), as well as echocardiography without ultrasound enhancing agents and other non-echocardiography agents, and there is the potential for future competition from generic manufacturers who may submit regulatory applications using DEFINITY as the reference listed drug (RLD).

We launched DEFINITY in 2001, and we continue to maintain patent and patent applications in connection with DEFINITY, both in the United States and internationally. In the United States for DEFINITY we have Orange Book-listed method-of-use patents, that extend until 2037, as well as additional manufacturing patents that are not Orange Book-listed expiring in 2037.

Because our Orange Book-listed composition of matter patent expired in June 2019, we may face generic DEFINITY challengers (see Part I, Item 1., “Business - Regulatory Matters - Hatch Waxman Act” of this Form 10-K). As of the date of filing of this Form 10-K we have not received any notice of a generic applicant pursuant to the Hatch Waxman Act, but we can give no assurance that we will not receive a notice in the future. If we were to receive any such notice in the future, we would review the notice, evaluate the strength of any potential patent infringement claims, and be prepared to challenge the applicant in a timely fashion, which would thereby trigger the stay of up to 30 months. We can give no assurance that we would have grounds to file a patent infringement suit, that we would obtain the full 30-month stay, that we would be successful on the merits asserting that an applicant infringes our Orange Book-listed patent, or that we would be successful defending the validity of our Orange Book-listed patent in court or in a U.S. Patent and Trademark Office (“USPTO”) adversarial proceeding. We recently received a request for samples of DEFINITY pursuant to the Creating and Restoring Equal Access to Equivalent Samples (“CREATES”) Act of 2019, a U.S. federal law designed to facilitate generic and biosimilar drug development. A request under the CREATES Act may indicate that a generic or biosimilar manufacturer is pursuing development of a competitive version of DEFINITY, as access to reference product samples or related safety protocols is generally sought to conduct studies required for regulatory approval. While such a request does not guarantee that a competing product will be approved or commercialized, it may signal increased risk of future generic or biosimilar entry and related litigation. As stated above in connection with the Hatch Waxman Act, if

approval for such a generic product is sought by a competitor, we will evaluate the strength of any potential patent infringement claims and be prepared to challenge the applicant in a timely fashion. As a general matter, patent litigation is complex and can be protracted and expensive, so if we were to challenge an applicant, this could have a negative effect on our business, results of operations and financial condition.

If we are not able to continue to grow DEFINITY sales, which depend on one or more of the growth of echocardiograms, the growth in the appropriate use of ultrasound enhancing agents in suboptimal echocardiograms, and our ability to maintain and grow our leading position in the U.S. echocardiography ultrasound enhancing agent market, we may not be able to continue to grow the revenue and cash flow of our business, which could have a negative effect on our business, results of operations and financial condition.

Our ability to grow Neuraceq is dependent on (A) our ability to engage our existing PYLARIFY customers to introduce Neuraceq to those customers, (B) expanded geographical access to Neuraceq, which in turn depends on our ability to increase Neuraceq manufacturing capacity at existing manufacturing sites and add additional sites, (C) increased adoption and utilization of beta-amyloid PET and anti-amyloid therapeutics, (D) increased utilization based on the updated Neuraceq prescribing information indicating that Neuraceq can be used for patient selection for anti-amyloid therapies where the prescribing information for the therapy so states, (E) our ability to educate customers on the approved uses of Neuraceq, including its ability to quantify the degree of amyloid burden in the brain and (F) our ability to clinically differentiate Neuraceq from competitive products so that customers choose Neuraceq for appropriate patients because of its clinical attributes and despite the disparity in MUC payment rates for Neuraceq compared to other products used for traditional Medicare patients in the hospital outpatient setting.

Similar to PYLARIFY, Neuraceq is manufactured by a nationwide network of PMFs with radioisotope-producing cyclotrons that make F-18, which has a 110-minute half-life, so Neuraceq is manufactured and distributed rapidly to end-users, and each PMF manufacturing site has to be separately approved by the FDA. Currently, Neuraceq growth is dependent on our ability to expand and increase capacity at existing sites and a corresponding increase in use by customers. We also continue to seek qualification for additional PMFs in 2026 and we can give no assurance that additional PMF sites will have the capacity to produce Neuraceq in addition to other products they may already produce, including other F-18-based products, that those PMF sites will be willing to commit to manufacture Neuraceq and successfully complete the technology transfer process necessary to manufacture Neuraceq, that the FDA will continue to approve PMFs in accordance with our expansion plans to meet product demand or that Neuraceq will be available at the specific time of day preferred by the end-users or that our expansion plans accurately predict demand growth. If production capacity is not available, FDA approval of manufacturing sites is delayed or withdrawn, FDA requirements relating to site approval change in a way that impacts our ability to meet demand for Neuraceq or end users scheduling needs or if we invest to extend our PMF network and demand does not grow to meet the expanded capacity, our business, results of operations, financial condition and cash flows would be adversely affected.

Ensuring adequate coding, coverage, and payment for Neuraceq is critical, including not only coverage from Medicare, Medicaid and other government payors, as well as private payors, but also appropriate payment levels to adequately cover our customers’ costs of using Neuraceq in PET/ CT imaging procedures. Neuraceq was approved by the FDA in 2014. When used for traditional Medicare patients in the hospital outpatient setting, Neuraceq is paid based on its MUC; however, Neuraceq currently competes with two commercially available F-18 beta-amyloid-targeting PET imaging agents from Eli Lilly and Co (“Lilly”) and GE Healthcare, and those other competitive imaging agents are currently being paid based on a higher MUC rate. While we have engaged with CMS to support the use of ASP instead of MUC, we can give no assurances that CMS will move to the use of ASP in the near term or that the availability of a higher MUC payment rate for other diagnostic radiopharmaceuticals will not continue to impact clinical decision making regarding which product to use for all patient populations, which could have an adverse effect on our business, results of operations, financial condition and cash flows.

In addition, growth and revenue contribution from Neuraceq will also depend on our ability to clinically differentiate Neuraceq from competitive products and to educate customers on the approved uses of Neuraceq, including its ability to quantify the degree of amyloid burden in the brain so that customers choose Neuraceq for appropriate patients because of its clinical attributes and despite the disparity in MUC payment rates for Neuraceq compared to other products used for traditional Medicare patients in the hospital outpatient setting. Further, certain currently approved therapeutic products in the United States require confirmation of the presence of amyloid beta pathology prior to initiating treatment. If this requirement in the prescribing information for these products were to change it could have an adverse effect on our business, results of operations, financial condition and cash flows.

Our dependence upon third parties for the manufacture and supply of a substantial portion of our products, including PYLARIFY and Neuraceq, and certain key components and raw materials and upon our in-house manufacturing for DEFINITY could prevent us from delivering our products to our customers in the required quantities, within the required timeframes, or at all, which could result in order cancellations, decreased revenues and reputational harm.

We obtain a substantial portion of our products from third party manufacturers and suppliers.

PYLARIFY and Neuraceq are manufactured by a nationwide network of PMFs with radioisotope-producing cyclotrons. The radioisotope in both PYLARIFY and Neuraceq is fluorine-18, which has a 110-minute half-life, so PYLARIFY and Neuraceq are manufactured and distributed rapidly to end-users. Because each of the PMFs manufacturing PLYARIFY and Neuraceq is deemed by the FDA to be a separate manufacturing site, each has to be separately approved by the FDA to manufacture each product. Although we have qualified and continue to qualify additional PMFs, we can give no assurance that additional PMF sites will have the capacity to produce PYLARIFY and Neuraceq in addition to other products they may already produce, including other F-18-based products, that those PMF sites will be willing to commit to manufacture PYLARIFY and Neuraceq and successfully complete the technology transfer process necessary to manufacture PYLARIFY and Neuraceq, that the FDA will continue to approve PMFs in accordance with our planned roll-out schedule or that the PMFs will not experience issues with their ability to manufacture and deliver PYLARIFY or Neuraceq to our customers. If FDA approval of manufacturing sites is delayed or withdrawn, if FDA requirements relating to site approval change, or our PMF sites experience manufacturing issues, our business, results of operations, financial condition and cash flows could be adversely affected.

We rely on Jubilant HollisterStier as a substantial supplier of DEFINITY. We have additional supply arrangements for active pharmaceutical ingredients, excipients, packaging materials and other materials and components. In addition, for reasons of quality assurance or cost-effectiveness, we purchase certain components and raw materials from sole suppliers (including, for example, the specially designed chemistry synthesis boxes and consumables used in the manufacturing of each of PYLARIFY and Neuraceq and the lipid blend material and perflutren gas used in the manufacturing of DEFINITY). Because we do not control the actual production of many of the products we sell and many of the raw materials and components that make up the products we sell, if a supplier is unable to provide required materials or equipment and a readily available substitute does not exist, we may be subject to delays caused by interruption in production based on events and conditions outside of our control, which could disrupt manufacturing, increase expenses, and negatively impact our business, financial condition, and results of operations.

If we or one of our manufacturing partners or suppliers experiences an event, including a supply chain disruption, shortage or delay, logistics issue, labor dispute, natural disaster, fire, power outage, machinery breakdown, security problem, failure to meet regulatory requirements, product quality issue, technology transfer issue, cybersecurity breach or other issue, we or one of our manufacturing partners or suppliers may be unable or unwilling to manufacture the relevant products at previous levels or on the forecasted schedule, if at all, our business, results of operations, financial condition and cash flows could be adversely affected and result in reputational harm. Due to the stringent regulations and requirements of the governing regulatory authorities regarding the manufacture of our products, we may not be able to quickly restart manufacturing at a third party or our own facility or establish additional or replacement sources for certain products, components or materials, which could also adversely affect our business, results of operations, financial condition and cash flows and result in reputational harm.

We can give no assurance that Curium Pharma (“Curium”) will continue to be successful with its commercialization of PYLCLARI in Europe or that GE Healthcare will successfully develop and commercialize piflufolastat F-18 in Japan.

We licensed exclusive rights to develop and commercialize piflufolastat F-18 (marketed in the United States as PYLARIFY) to Curium in Europe and to GE Healthcare in Japan. Under the terms of the collaboration with Curium, we are entitled to double-digit royalties on net sales of piflufolastat F-18, which is commercialized in Europe under the name PYLCLARI. PYLCLARI is commercially available in over ten countries in Europe. We cannot assure that Curium will continue to be successful in commercializing it in Europe. Any failure or significant delay in Curium’s ability to continue making PYLCLARI available in additional countries in Europe may harm our business and delay or prevent us from being able to generate additional future royalty revenue from product sales. On September 24, 2025, we announced an exclusive licensing agreement for GE Healthcare to develop, manufacture, and commercialize piflufolastat in Japan for prostate cancer diagnostics and companion diagnostic use. Under the terms of the agreement, GE Healthcare paid us an upfront license fee and will pay us development milestones and tiered royalties based on product sales in Japan. We cannot assure that GE Healthcare will be successful in developing, manufacturing or commercializing it in Japan and any failure or significant delay may harm our business and delay or prevent us from being able to receive milestone payments and generate future royalty revenue.

Our just-in-time manufacturing of radiopharmaceutical products, including PYLARIFY and Neuraceq, relies on the reliability of our PMFs’ equipment and processes, the timely receipt of radioactive raw materials and the timely shipment of finished goods, and any disruption of our supply or distribution networks could have a negative effect on our business.

Radiopharmaceutical products, including PYLARIFY and Neuraceq, rely on radioisotopes with limited half-lives. As a result, we or our partners must manufacture, finish and distribute these products on a just-in-time basis, because the underlying radioisotope is in a constant state of decay. For example, the radioisotope used in PYLARIFY and Neuraceq is F-18, which has a 110-minute half-life, requiring that this product be manufactured and distributed within the same day to end-users. After being made on a cyclotron at a PMF, the F-18 is then combined with certain specially designed ingredients in a chemistry synthesis box to manufacture either PYLARIFY or Neuraceq. The finished product is then quality control tested and transferred to a radiopharmacist who prepares and dispenses patient-specific doses from the final product. Any delay in us receiving radioisotopes, raw materials, equipment or components from suppliers or being able to have finished products delivered to customers because of equipment failure, weather or other unforeseen issues could have a negative effect on our business, results of operations, financial condition and cash flows.

If one of our PMFs experience an event, including a labor dispute, natural disaster, fire, power outage, machinery breakdown, security problem, failure to meet regulatory requirements, product quality issue, technology transfer issue or other issue, we may be unable to manufacture the relevant products at previous levels or on the forecasted schedule, if at all. Due to the stringent regulations and requirements of the governing regulatory authorities regarding the manufacture of our products, we may not be able to quickly restart manufacturing at a PMF facility, or establish additional or replacement sources for certain products, components or materials, which could have a negative effect on our business, results of operations, financial condition and cash flows.

We face significant competition in our business and may not be able to compete effectively.

The markets for our products are highly competitive and continually evolving. Our competitors for our current commercial products and leading clinical development candidates include large, global companies that are more diversified than we are and that have substantial financial, manufacturing, sales and marketing, distribution and other resources:

Any product candidates that we successfully develop and commercialize will compete with existing products and new products that may become available in the future, not only for customers but also for manufacturing resources, including PMF site capacity, raw materials, components, equipment and radiopharmacist time and, for our diagnostic imaging agents, staff at imaging centers and hospitals and PET scanner capacity. For example, for PNT2003, our principal competitors may include Novartis AG; ITM Radiopharma; Curium, and RayzeBio (acquired by Bristol Myers Squibb). For MK-6240 and NAV-4694, our principal competitors may include Lilly and GE Healthcare. For LNTH-2501, our principal competitors may include Curium and Novartis AG.

We cannot anticipate the actions of our current or future competitors in the same or competing modalities, such as significant price reductions on products that are competitive with our own, the ability to offer a portfolio of products and offer price reductions across a portfolio, development of new products that are more cost-effective or have superior performance or higher reimbursement than our current products, potential future products or the introduction of generic versions of our proprietary products, the ability to secure better manufacturing locations or times for production of current or future products that limit the availability of necessary raw materials, production equipment, components or radiopharmacist time or, for our diagnostic agents, PET scanner capacity. In addition, distributors of our products could attempt to shift end-users to competing diagnostic modalities and products, or bundle the sale of a portfolio of products, in either case to the detriment of our specific products. Our current or future products could be rendered obsolete or uneconomical as a result of these activities or other market dynamics that are beyond our control.

Further, the radiopharmaceutical industry continues to evolve strategically, with several market participants recently acquired by larger companies that may have more significant resources than ours. In addition, the supply-demand dynamics of the industry are complex because of large market positions of some participants, legacy businesses, government subsidies (in particular, relating to the manufacture of radioisotopes), and group purchasing arrangements and there are often limited sources available for isotopes and raw materials, including components and equipment, used in the manufacturing of our product and product candidates. We cannot predict what impact new owners, new operators and the involvement of larger companies with more significant resources may have on the strategic decision-making of our competitors, customers and suppliers, and such decision-making could have a material adverse effect on our business, results of operations, financial condition and cash flows.

In addition, in order to remain competitive, in certain circumstances, we provide customers with rebates, which we estimate as a reduction to revenue at the time revenue is recognized. Judgment is required in making these estimates. These rebates can include performance-based offers that are based on attaining contractually specified sales volumes, Medicaid rebate programs for our products, administrative fees of group purchasing organizations and certain distributor-related commissions. The calculation of the accrual for these rebates is based on an estimate of the third-party’s expected purchases and the resulting applicable contractual rebate to be earned over a contractual period and our estimates can vary by program, product, type of customer and geographic location. In determining the appropriate accrual amount, we consider the contractual terms, historical sales, and changes in sales trends. Specific rebates can impact year-over-year individual product revenue growth trends. If any of our assessments, assumptions, experiences or judgments are not indicative or accurate estimates of our future experience, our results could be impacted.

Ultrasound enhancing agents may cause side effects which could limit our ability to sell DEFINITY.

DEFINITY is an ultrasound enhancing agent based on perflutren lipid microspheres. In 2007, the FDA received reports of deaths and serious cardiopulmonary reactions following the administration of ultrasound enhancing agents used in echocardiography. Four of the 11 reported deaths were caused by cardiac arrest occurring either during or within 30 minutes following the administration of the ultrasound enhancing agent; most of the serious but non-fatal reactions also occurred in this time frame. As a result, in October 2007, the FDA requested that we and GE Healthcare, which distributes Optison, a competitor to DEFINITY, add a boxed warning to these products emphasizing the risk for serious cardiopulmonary reactions and that the use of these products was contraindicated in certain patients. The FDA modified the boxed warning language several times such that after changes in January 2017, the safety labeling for DEFINITY, Optison and Bracco’s ultrasound enhancing agent, Lumason, all had similar safety labeling. In April 2021, after reviewing certain adverse events that occurred in patients with a prior history of allergic reactions to polyethylene glycol (“PEG”), an inactive excipient in both DEFINITY and Lumason, the FDA and the marketing authorization holders of these products agreed to an additional contraindication for use of these products, including advising clinicians to assess patients for prior PEG hypersensitivity before administering these products. In June 2023, after reviewing adverse events that occurred in patients with history of sickle cell disease, we agreed with the FDA to amend the label to advise clinicians that if a patient with sickle cell disease experiences acute pain episodes following DEFINITY administration, use of DEFINITY in that patient should be discontinued. If additional safety issues arise (not only with DEFINITY but also potentially with Optison and Lumason), this may result in unfavorable changes in labeling or result in restrictions on the approval of our product, including removal of the product from the market. Lingering safety concerns about DEFINITY among some healthcare providers or future unanticipated side effects or safety concerns associated with DEFINITY could limit expanded use of DEFINITY and have a material adverse effect on the unit sales of this product and our financial condition and results of operations.

Risks Related to Reimbursement and Regulation

Many of our customers are highly dependent on payments from third-party payors, including government sponsored programs, particularly Medicare, in the United States and other countries in which we operate, and reductions in third party coverage and reimbursement rates for our products (or services provided by healthcare providers using our products) could adversely affect our business, results of operations, financial condition and cash flows.

A substantial portion of our revenue depends on the extent to which the costs of our products purchased by our customers (or services provided by healthcare providers using our products) are reimbursed by third party payors, including Medicare, Medicaid, other U.S. government sponsored programs, non-U.S. governmental payors and private payors. These third-party payors exercise significant control over patient access and increasingly use their enhanced bargaining power to secure discounted rates and impose other requirements that may reduce demand for our products. Our customers’ ability to obtain adequate reimbursement for products and services from these third-party payors affects the selection of products they purchase and the prices they are willing to pay. If Medicare and other third party payors do not provide adequate reimbursement for the costs of our products (or services provided by healthcare providers using our products), deny the coverage of the products (or those services), reduce current levels of reimbursement, or reimburse competitive products at a higher rate than that available for our products, healthcare professionals may not prescribe our products and providers and suppliers may not purchase our products.

In addition, demand for new products may be limited unless we obtain favorable reimbursement (including coding, coverage and payment) from governmental and private third party payors at the time of the product’s introduction, which will depend, in part, on our ability to demonstrate that a new agent has a positive impact on clinical outcomes, and to maintain favorable reimbursement relative to competitive products. Third-party payors continually review their coverage policies for existing and new products and procedures and can deny coverage for products or procedures that include the use of our products or revise payment policies such that payments do not adequately cover the cost of our products. Even if third-party payors make coverage and reimbursement available, that reimbursement may not be adequate or may favor competitive products and these payors’ reimbursement policies may have an adverse effect on our business, results of operations, financial condition and cash flows.

Over the past several years, Medicare has implemented numerous changes to payment policies for imaging procedures in both the hospital setting and non-hospital settings (which include physician offices and freestanding imaging facilities). Some of these changes have had a negative impact on utilization of imaging services. Examples of these changes include:

In the physician office and free-standing imaging facility setting, services provided by healthcare providers using our products are reimbursed under the Medicare physician fee schedule. Payment rates under the Medicare physician fee schedule are regularly subject to updates to effectuate various policy goals of CMS and Congress. For example, in 2022, CMS reduced Medicare fee schedule payments rates in the agency’s final rulemaking, while a larger cut was put forth in the proposed rulemaking earlier that year. For 2023, CMS had finalized a reduction in the Medicare fee schedule payments rates, which was revised by Congress, pursuant to the Consolidated Appropriations Act, 2023, to a lesser reduction. Additionally, since 2019, fee schedule payments have been adjusted for certain physicians based on their performance under a consolidated measurement system (that measures performance with respect to quality, resource utilization, meaningful use of certified electronic health records technology, and clinical practice improvement activities). Physicians are eligible for a bonus based on the use of certain alternative payment models designated as “advanced” by CMS. The ongoing and future impact of these changes cannot be determined at this time.

We believe that Medicare changes to payment policies for imaging procedures applicable to non-hospital settings will continue to result in certain physician practices ceasing to provide these services and a further shifting of where certain medical imaging procedures are performed, from the physician office and free-standing imaging facility settings to the hospital outpatient setting. Changes applicable to Medicare payment in the hospital outpatient setting could also influence the decisions by hospital outpatient physicians to perform procedures that involve our products. Changes to the Medicare hospital outpatient prospective payment system payment rates, including reductions implemented for certain hospital outpatient sites, could influence the decisions by hospital outpatient physicians to perform procedures that involve our products and the risks discussed above with respect to separate payment for diagnostic radiopharmaceuticals in the hospital outpatient setting could also impact clinical decision-making.

We also believe that these changes and their resulting pressures may incrementally reduce the overall number of diagnostic medical imaging procedures performed. These changes overall could slow the acceptance and introduction of next-generation imaging equipment into the marketplace, which, in turn, could adversely impact the future market adoption of certain of our imaging agents already in the market or currently in development. We expect that there will continue to be proposals to reduce or limit Medicare and Medicaid payment for diagnostic services, which could impact our current or potential future diagnostic and other types of products and have a material adverse effect on our business, results of operations, financial condition and cash flows.

Under section 218(b) of the Protecting Access to Medicare Act, beginning January 1, 2020, a professional who is ordering advanced diagnostic imaging services (which include MRI, CT, nuclear medicine (including PET) and other advanced diagnostic imaging services that the Secretary of U.S. Department of Health and Human Services (“HHS”) may specify, but not currently including echocardiography) must consult a qualified clinical decision support mechanism, as identified by HHS, to determine whether the ordered service adheres to specified appropriate use criteria (“AUC”) developed or endorsed by CMS-qualified “provider led entities”. Medicare claims for such services must include information indicating whether services ordered would adhere to specified applicable AUC. Denial of claims for failure to include AUC consultation information on the claim form was set to begin on January 1, 2022, but was not implemented by CMS. In the CY 2024 Physician Fee Schedule Final Rule, CMS determined that it was not feasible to fully operationalize the AUC program consistent with the statute within the required time frame. Accordingly, the agency finalized an indefinite pause to the AUC program and the rescission of the regulations promulgated thus far to implement the AUC program. While it is unclear when CMS will resume implementation of the AUC program, to the extent that these types of changes have the effect of reducing the aggregate number of diagnostic medical imaging procedures performed in the United States, our business, results of operations, financial condition and cash flows could be adversely affected.

Medicare coverage of PET radiopharmaceuticals has been the subject of a large number of National Coverage Determinations (“NCDs”) by CMS since 2000. Specific indications for PET imaging were covered, some through Coverage with Evidence Development. CMS’s longtime policy, however, was that a particular use of PET scans is not covered unless an NCD specifically provided that such use was covered. Effective March 7, 2013, CMS revised its policy through an NCD to allow local Medicare Administrative Contractors (“MACs”) to determine coverage within their respective jurisdictions for PET using radiopharmaceuticals for their FDA-approved labeled indications for oncologic imaging. Effective January 1, 2022, non-coverage in the absence of an NCD has also been removed for non-oncologic indications of PET radiopharmaceuticals, allowing MACs to determine coverage for these indications within their respective jurisdictions. To the extent that CMS or the MACs impose more restrictive coverage, our business, results of operations, financial condition and cash flows could be adversely affected.

Reforms to the United States healthcare system, including changes to policies, guidelines and practices of regulatory authorities, may adversely affect our business.

A significant portion of our patient volume is derived from U.S. government healthcare programs, principally Medicare, which are highly regulated and subject to frequent and substantial changes. The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act (collectively, the “Healthcare Reform Act”) substantially changed the way healthcare is financed by both governmental and private insurers. The law contains a number of provisions that affect coverage and reimbursement of drug products and medical imaging procedures performed in the United States. Subsequently, the Medicare Access and CHIP Reauthorization Act of 2015 significantly revised the methodology for updating the Medicare physician fee schedule. In 2017, Congress enacted legislation that effectively eliminated the Healthcare Reform Act's “individual mandate” beginning in 2019. On July 4, 2025, President Trump signed into law the One Big Beautiful Bill Act (the “OBBBA”), which will reduce existing patient coverage under Medicaid. The expiration of certain subsidies for Marketplace coverage currently in place under the Healthcare Reform Act at the end of 2025 may also cause material coverage losses. The OBBBA further restricts Medicaid financing, which will decrease federal funds available to state Medicaid agencies and may result in reduced state Medicaid agency reimbursement rates. Congress continues to consider other healthcare reform legislation. There is no assurance that the Healthcare Reform Act, as currently enacted or as amended in the future, will not adversely affect our business and financial results, and we cannot predict how future federal or state legislative, judicial or administrative changes relating to healthcare reform will affect our business.

In addition, other legislative changes have been proposed and adopted since the Healthcare Reform Act was enacted. The Budget Control Act of 2011 and subsequent Congressional actions includes provisions to reduce the federal deficit. These provisions have resulted in the imposition of 2% reductions in Medicare payments to providers, which went into effect on April 1, 2013 and will remain in effect through fiscal year 2030. The imposition of the 2% payment adjustment had been suspended through March 31, 2022 and went into effect as of April 1, 2022. The Congressional Budget Office estimates that, absent future action, the OBBBA will lead to $490 billion in Medicare cuts from 2027 to 2034. Any significant spending reductions affecting Medicare, Medicaid or other publicly funded or subsidized health programs that may be implemented and/or any significant taxes or fees that may be imposed on us, as part of any broader deficit reduction effort or legislative replacement to the Budget Control Act, could have an adverse impact on our business, results of operations, financial condition and cash flows.

Further, changes in payor mix and reimbursement by private third-party payors may also affect our business. Rates paid by some private third-party payors are based, in part, on established physician, clinic and hospital charges and are generally higher than Medicare payment rates. Reductions in the amount of reimbursement paid for diagnostic medical imaging procedures, including the elimination of any additional payment such as TPT Status, and changes in the mix of our patients between non-governmental payors and government sponsored healthcare programs and among different types of non-government payor sources, could have a material adverse effect on our business, results of operations, financial condition and cash flows.

The full impact on our business of healthcare reforms and other new laws, or changes in existing laws, the interpretations of those laws, or changes to the way regulations and regulatory guidance has been implemented, amended and interpreted, is uncertain. Nor is it clear whether additional legislative or executive branch changes will be adopted or how those changes would affect our industry in general or our ability to successfully commercialize our products or develop or commercialize new products. For example, recent government actions, including reductions in staff and department reorganizations, including those at the FDA, could adversely affect the timing of anticipated regulatory actions or their outcome, and could change historical practices relating to the application or interpretation of regulations relevant to our operations in ways that could have an adverse effect on our business. It is unclear exactly how changes implemented by the U.S. government will affect the U.S. healthcare system, and what impact this will have on our business. If the reforms made by the OBBBA are implemented and result in predicted coverage losses, these changes could reduce the overall number of diagnostic medical imaging procedures performed, reduce reimbursement rates, or both. Additionally, changes in U.S. drug pricing policies, including initiatives that seek to link domestic prices to those paid in other countries under “most‑favored‑nation” pricing concepts, could increase pricing pressure on our products. Any such policies, if implemented or expanded, could reduce reimbursement levels, constrain pricing flexibility, and adversely affect our revenues and results of operations.

Our business and industry are subject to complex and costly regulations. If government regulations are interpreted or enforced in a manner adverse to us or our business, we may be subject to enforcement actions, penalties, exclusion and other material limitations on our operations.

Both before and after the approval of our products in development, we, our products, development products, operations, facilities, suppliers, distributors, contract manufacturers, contract research organizations and contract testing laboratories are subject to extensive and, in certain circumstances, expanding regulation by federal, state and local government agencies in the United States., as well as non-U.S. and transnational laws and regulations, with regulations differing from country to country and even state to state, including, among other things, anti-trust and competition laws and regulations, and data privacy laws and regulations such as the General Data Protection Regulation in the European Union and the California Consumer Privacy Act and the California Privacy Rights Act. In the United States, the FDA regulates, among other things, the pre-clinical testing, clinical trials, manufacturing, safety, efficacy, potency, labeling, storage, record keeping, quality systems, advertising, promotion, sale, distribution, and import and export of drug products. We are required to register our business for permits and/or licenses with, and comply with the stringent requirements of the FDA, the Nuclear Regulatory Commission, the HHS, Health Canada, the EMA, the U.K. Medicines and Healthcare Products Regulatory Agency (“MHRA”), the National Medical Products Administration, state and provincial boards of pharmacy, state and provincial health departments and other federal, state and provincial agencies. Violation of any of these regulatory schemes, individually or collectively, could disrupt our business and have a material adverse effect on our business, results of operations, financial condition and cash flows.

Under U.S. law, for example, we are required to report certain adverse events and production problems, if any, to the FDA or other federal or state regulators. We also have similar adverse event and production reporting obligations outside of the United States, including to the EMA and MHRA. Additionally, we must comply with requirements concerning advertising and promotion for our products, including the prohibition on the promotion of our products for indications for which they have not been approved by the FDA or a so-called “off-label use” or promotion that is inconsistent with the approved labeling. If the FDA determines that our promotional materials constitute unlawful promotion, it could request that we modify our promotional materials or subject us to regulatory or enforcement actions. Also, quality control and manufacturing procedures at our own facility and at third-party suppliers must conform to current Good Manufacturing Practices (“cGMP”) regulations and other applicable law after approval, and the FDA periodically inspects manufacturing facilities to assess compliance with cGMPs and other applicable law, and, from time to time, makes those cGMPs more stringent. Accordingly, we and others with whom we work must expend time, money, and effort in all areas of regulatory compliance, including manufacturing, production and quality control. If in the future issues arise at our own manufacturing facility or at a third-party manufacturer, the FDA could take regulatory action which could limit or suspend the ability to manufacture our products or have any additional products approved at the relevant facility for manufacture until the issues are resolved and remediated. Such a limitation or suspension could have a material adverse effect on our business, results of operations, financial condition and cash flows.

We are also subject to laws and regulations that govern financial and other arrangements between pharmaceutical manufacturers and healthcare providers, including federal and state anti-kickback statutes, federal and state false claims laws and regulations, federal and state “sunshine” laws and regulations and other fraud and abuse laws and regulations.

We must offer discounted pricing or rebates on purchases of pharmaceutical products under various federal and state healthcare programs, such as the Medicaid drug rebate program, the 340B drug pricing program and the Medicare Part D Program. We must also report specific prices and price-related information to government agencies under healthcare programs, such as the Medicaid drug rebate program and Medicare Part B. Our Medicaid Drug Rebate agreements require us to report certain price information to the federal government. Determination of the rebate amount that we pay to state Medicaid programs for our products, of prices charged to government and certain private payors for our products, or of amounts paid for our products under government healthcare programs, depends upon information reported by us to the government and calculations of discounted pricing or rebates can be impacted in certain cases by the lowest price we offer to customers not participating in such government programs. For example, the calculation of the 340B drug price we can charge for our products is determined on a quarterly basis, based in part on the lowest, or best, price we sold that product to a customer not purchasing under a government program. To the extent we reduce our best price, the 340B drug price will also be reduced. If we provide customers or government officials with inaccurate information about the products’ pricing or eligibility for coverage, or the products fail to satisfy coverage requirements, we could be terminated from the rebate program, be excluded from participation in government healthcare programs, or be subject to potential liability under the False Claims Act or other laws and regulations. To the extent more of our customers purchase our products under these various federal or state healthcare programs, this may reduce the net revenue we receive for such product and the gross margin associated with such product.

Failure to comply with other requirements and restrictions placed upon us or our third-party manufacturers or suppliers by laws and regulations can result in fines, civil and criminal penalties, exclusion from federal healthcare programs and debarment. Possible consequences of those actions could include:

Our marketing and sales practices may contain risks that could result in significant liability, require us to change our business practices, and restrict our operations in the future.

We are subject to numerous domestic (federal, state and local) and foreign laws addressing fraud and abuse in the healthcare industry, including the FCA and federal Anti-Kickback Statute, self-referral laws, the Foreign Corrupt Practices Act (“FCPA”), the U.K. Bribery Act (the “Bribery Act”), FDA promotional restrictions, the federal disclosure (sunshine) law and state marketing and disclosure (sunshine) laws, as well as in other countries where we do business and where our products, including investigational products, may be used.

The FCPA, the Bribery Act and similar worldwide anti-bribery laws in non-U.S. jurisdictions generally prohibit companies and their intermediaries from making improper payments to non-U.S. officials for the purpose of obtaining or retaining business.

The FCPA prohibits us from providing anything of value to foreign officials for the purposes of obtaining or retaining business or securing any improper business advantage. It also requires us to keep books and records that accurately and fairly reflect our transactions. Because of the predominance of government-sponsored healthcare systems around the world, many of our customer relationships outside of the United States are, either directly or indirectly, with governmental entities and are therefore subject to the FCPA and similar anti-bribery laws in non-U.S. jurisdictions. In addition, the provisions of the Bribery Act extend beyond bribery of foreign public officials and are more onerous than the FCPA in a number of other respects, including jurisdiction, non-exemption of facilitation payments and penalties.

Violations of these laws are punishable by criminal or civil sanctions, including substantial fines, imprisonment and exclusion from participation in healthcare programs such as Medicare and Medicaid, as well as health programs outside the United States, and even settlement of alleged violations can result in the imposition of corporate integrity agreements that could subject us to additional compliance and reporting requirements and impact our business practices. These laws and regulations are complex and subject to changing interpretation and application, which could restrict our sales or marketing practices. Even minor and inadvertent irregularities could potentially give rise to a charge that the law has been violated. Our policies mandate compliance with these anti-bribery laws. We operate in many parts of the world that have experienced governmental corruption to some degree, and in certain circumstances compliance with anti-bribery laws may conflict with local customs and practices. Despite our training and compliance programs, our internal control policies and procedures may not always protect us from criminal acts committed by our employees or agents. Additionally, if there is a change in law, regulation or administrative or judicial interpretations, we may have to change one or more of our business practices to be in compliance with these laws. Required changes could be costly and time consuming.

Risks Related to Our Intellectual Property and Related Legal Proceedings

We are involved in various legal proceedings that are uncertain, costly and time-consuming and could have a material adverse impact on our business, financial condition and results of operations.

From time to time we are involved in legal proceedings and disputes, such as the PNT2003 Litigation (as defined below), and may be involved in litigation in the future. Legal proceedings are complex and extended and occupy the resources of our management and employees. Legal proceedings are also costly to prosecute and defend and may involve substantial awards or damages payable by us if not found in our favor. We may be required to pay substantial amounts or grant certain rights on unfavorable terms in order to settle such proceedings. Defending against or settling legal proceedings and any unfavorable legal decisions, settlements or orders could have a material adverse effect on our business, financial condition and results of operations and could cause the market value of our common stock to decline.

For example, on January 26, 2024, we were sued in the United States District Court for the District of Delaware by Advanced Accelerator Applications USA, Inc. and Advanced Accelerator Applications SA, each a Novartis entity, for patent infringement in response to the filing of our ANDA for PNT2003 and Paragraph IV certification, consistent with the process established by the Hatch-Waxman Act.

Additionally, in 2024 we filed a patent infringement lawsuit against a healthcare-related imaging software developer, and that litigation is ongoing. While we believe it is important to vigorously protect our intellectual property, intellectual property litigation can be costly and time-consuming, and we cannot predict the path that this or any other litigation may take or what the potential outcome may be.

For additional information regarding risk associated with legal proceedings other than those related to intellectual property, See “Our business and operations could be negatively affected by any pending or future securities litigation.”

We, or our business partners, may be subject to claims that we, or our partners, have infringed, misappropriated or otherwise violated the patent or other intellectual property rights of a third party. The outcome of any of these claims is uncertain and any unfavorable result could adversely affect our business, results of operations, financial condition and cash flows.

We, or our business partners, may be subject to claims by third parties that we, or our partners, have infringed, misappropriated or otherwise violated third-party intellectual property rights. We are aware of intellectual property rights held by third parties that relate to products or technologies we are developing. For example, we are aware of other groups investigating PSMA or related compounds and monoclonal antibodies directed at PSMA, and PSMA-targeted imaging agents and therapeutics, and of patents held, and patent applications filed, by these groups in those areas. While the validity of these issued patents, the patentability of pending patent applications and the applicability of any of them to our products and programs are uncertain, if asserted against us or our partners, any related patent or other intellectual property rights could adversely affect our ability to commercialize our products.

In particular, the pharmaceutical and medical device industries historically have generated substantial litigation concerning the manufacture, use and sale of products, and we expect this litigation activity to continue. As a result, we may be subject to litigation over infringement claims regarding the products we manufacture or distribute or intend to manufacture or distribute. For example, on January 26, 2024, we were sued in the United States District Court for the District of Delaware by Advanced Accelerator Applications USA, Inc. and Advanced Accelerator Applications SA, each a Novartis entity, for patent infringement in response to the filing of our ANDA for PNT2003 and Paragraph IV certification, consistent with the process established by the Hatch-Waxman Act (the “PNT2003 Litigation”). This type of litigation can be costly and time-consuming and could divert management’s attention and resources, generate significant expenses, damage payments (potentially including treble damages) or restrictions or prohibitions on our use of our technology, which could adversely affect our business, results of operations, financial condition and cash flows. In addition, if we or one of our partners are found to be infringing on proprietary rights of others, we may be required to develop non-infringing technology, obtain a license (which may not be available on reasonable terms, or at all), make substantial one-time or ongoing royalty payments, or cease making, using and/or selling the infringing products, any of which could have a material adverse effect on our business, results of operations, financial condition and cash flows.

In addition, in the United States, it has become increasingly common for patent infringement actions to prompt claims that antitrust laws have been violated during the prosecution of the patent or during litigation involving the defense of that patent. Such claims by direct and indirect purchasers and other payors are typically filed as class actions. The relief sought may include treble damages and restitution claims. Similarly, antitrust claims may be brought by government entities or private parties following settlement of patent litigation, alleging that such settlements are anti-competitive and in violation of antitrust laws. In the United States and Europe, regulatory authorities have continued to challenge as anti-competitive so-called “reverse payment” settlements between branded and generic drug manufacturers. We may also be subject to other antitrust litigation involving competition claims unrelated to patent infringement and prosecution. A successful antitrust claim by a private party or government entity against us could have a material adverse effect on our business, financial condition and results of operations and could cause the market value of our common stock to decline.

If we are unable to protect our intellectual property, our competitors could develop and market products with features similar to our products, and demand for our products may decline.

Our commercial success will depend in part on obtaining and maintaining patent and trade secret protection of our commercial products and technologies and products in development, as well as successfully enforcing and defending these patents and trade secrets against third parties and their challenges, both in the United States and in foreign countries. We will only be able to protect our intellectual property from unauthorized use by third parties to the extent that we maintain the secrecy of our trade secrets and can enforce our valid patents and trademarks.

The patent positions of pharmaceutical and biotechnology companies can be highly uncertain and involve complex legal and factual questions for which important legal principles remain unresolved. In addition, changes in either the patent laws or in interpretations of patent laws in the United States or other countries may diminish the value of our intellectual property and we may not receive the same degree of protection in every jurisdiction. Accordingly, we cannot predict the breadth of claims that may be allowed or enforced in our patents or in third-party patents.

The degree of future protection for our proprietary rights is uncertain because legal means afford only limited protection and may not adequately protect our rights or permit us to gain or keep our competitive advantage. For example:

Moreover, the issuance of a patent is not conclusive as to its validity or enforceability. Third parties have challenged and are likely to continue challenging the validity or enforceability of patents that have been issued to us by the USPTO or the applicable foreign patent office or licensed to us. Our patents may be challenged, invalidated, held to be unenforceable, or circumvented, which could negatively impact their commercial value. Furthermore, patent applications filed outside the United States may be challenged by other parties, for example, by filing third-party observations that argue against patentability or an opposition. Such opposition proceedings are increasingly common in the European Economic Area (“EEA”) and are costly to defend.

The initiation, defense and prosecution of intellectual property suits (including Hatch-Waxman related litigation), interferences, oppositions and related legal and administrative proceedings are costly, time consuming to pursue and result in a diversion of resources, including a significant amount of management time. The outcome of these proceedings is uncertain and could significantly harm our business. If we are not able to enforce and defend the patents of our technologies and products, then we will have lost an opportunity that could have permitted us to exclude competitors from marketing products that directly compete with our products, which could have a material and adverse effect on our business, results of operations, financial condition and cash flows.

We also rely on trade secrets and other know-how and proprietary information to protect our technology, especially where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. We use reasonable efforts to protect our trade secrets, but our employees, consultants, contractors, outside scientific partners and other advisors may unintentionally or willfully disclose our confidential information to competitors or other third parties. Enforcing a claim that a third party improperly obtained and is using our trade secrets is expensive, time consuming and resource intensive, and the outcome is unpredictable. In addition, courts outside the United States are sometimes less willing to protect trade secrets. Moreover, our competitors may independently develop equivalent knowledge, methods and know-how. We rely on confidentiality agreements with our collaborators, employees, consultants and other third parties and invention assignment agreements with our employees to protect our trade secrets and other know-how and proprietary information concerning our business. These confidentiality agreements may not prevent unauthorized disclosure of trade secrets and other know-how and proprietary information, and there can be no guarantee that an employee or an outside party will not make an unauthorized disclosure of our trade secrets, other technical know-how or proprietary information, or that we can detect such an unauthorized disclosure. We may not have adequate remedies for any unauthorized disclosure. This might happen intentionally or inadvertently. It is possible that a competitor will make use of that information, and that our competitive position will be compromised, in spite of any legal action we might take against persons making those unauthorized disclosures, which could have a material and adverse effect on our business, results of operations, financial condition and cash flows.

Risks Related to Our Business Operations and Financial Results

We may not be able to hire or retain the number of qualified personnel, particularly scientific, medical and sales personnel, required for our business, which would harm the expansion of our internal research and development (“R&D”) capabilities, sales of our products and approval timelines for and commercialization of our product candidates and limit our ability to grow.

Competition in our industry for highly skilled scientific, healthcare and sales personnel is intense and we may compete with larger pharmaceutical companies that likely will have access to greater financial resources than we do. As we expand our product

candidate pipeline, including through acquisitions of products and product candidates from other companies, and develop and expand our internal R&D capabilities, we will need to continue to hire additional scientific, medical and regulatory personnel. In addition, as we seek to commercialize additional products, we will need to hire additional employees to assist us with such commercialization, including in sales, marketing, reimbursement, quality and medical affairs. If we are unable to retain our existing personnel, or attract and train additional qualified personnel, either because of competition in our industry for these personnel or due to insufficient financial resources, then timelines for the approval and commercialization of our product candidates could be impacted, our growth could be limited and it could have a material adverse effect on our business.

Changes to management or other key personnel, including the recent turnover in our leadership and senior management team, could have an adverse effect on our business.

Our success is substantially dependent upon the performance, contributions and expertise of our executive leadership, senior management team and other key personnel. Our executive leadership, senior management team and other key personnel play a significant role in formulating and executing on our long-term strategy, generating business and overseeing operations. We have experienced, and may continue to experience, significant executive management changes, including the consolidation of roles and responsibilities. Brian Markison, our former Chief Executive Officer (“CEO”), retired from the Company effective December 31, 2025, and Mary Anne Heino, the Chair of our Board of Directors, is serving as our CEO as of January 1, 2026 while the Board of Directors conducts a comprehensive search for our next CEO. Our former President, Paul Blanchfield, accepted a role with another company and left the Company in November 2025. We also have experienced and may continue to experience the departure and transition of other members of the leadership team.

These changes in our management team resulting from the hiring or departure of executives could disrupt our business and involve inherent risk. Any failure to find a timely and suitable replacement and ensure an effective transition within executive leadership, including the effective onboarding, assimilation, and retention of our management team and key employees, could hinder our strategic planning, business execution and future performance. In addition, executive leadership transition periods can be disruptive and may result in a loss of personnel with deep institutional or technical knowledge, or result in changes to business strategy or objectives, and may negatively impact our operations and relationships with employees and third-parties due to increased or unanticipated expenses, operational inefficiencies, uncertainty regarding changes in strategy, decreased employee morale and productivity, and increased turnover.

Further, we have increased our dependency on the remaining members of our executive management team to facilitate a smooth transition in leadership roles. Our executive officers are at-will employees; as such, their employment with us could terminate at any time, and any such departure could be particularly disruptive in light of the recent leadership changes. We also do not maintain key person life insurance policies on any of our executive officers. While we have experienced turnover on our executive leadership team, we have generally been able to fill positions by either promoting existing employees or attracting new, qualified individuals to lead key functional areas. Our inability to retain our existing executive leadership and senior management team, maintain an appropriate internal succession program or attract and retain additional qualified personnel could have a material adverse effect on our business.

Any constraint on the availability of staff at imaging centers and hospitals and PET scanners could impact our ability to continue to generate substantial revenue from PYLARIFY, grow Neuraceq, and successfully launch and commercialize radiodiagnostic products in our pipeline.

Use of our radiopharmaceutical diagnostic products is dependent upon the availability of staff at imaging centers and hospitals and PET scanners in the market. Accordingly, our ability to continue to generate substantial revenue from PYLARIFY, grow Neuraceq, and successfully launch new PET diagnostic products, including the new formulation of our PSMA PET imaging agent, MK-6240, LNTH-2501 and NAV-4694, is dependent upon the availability of such staff at imaging centers and hospitals and PET scanners generally and our ability to ensure on time availability of our products to meet user needs. If there are staff shortages among imaging centers or hospitals, or if PET scanner capacity becomes constrained, or we are unable to meet the expectations of these customers, that could have a material adverse effect on our business, results of operations, financial conditions and cash flows.

Our business depends on our ability to effectively manage existing products, successfully develop and launch new products and indications, generate actionable insights from data, and adapt to rapid technological and medical practice changes.

The healthcare and diagnostic imaging industries are characterized by rapid and continuous technological change, evolving clinical practices, and shifting customer expectations. Our success depends on our ability to manage and improve our existing products, develop and commercialize new products and new indications, and respond effectively to competitive and technological developments. This requires, among other things, our ability to fund product development and lifecycle management initiatives; anticipate and respond to customer needs and competitive actions; collect, analyze, and derive meaningful insights from available data; obtain timely regulatory approvals; manufacture products efficiently and reliably; protect and leverage our intellectual property; and meaningfully differentiate our products in the marketplace.

To remain competitive, we must make substantial and ongoing investments in product development, whether through internal research and development efforts or through external licensing arrangements or acquisitions. If we are unable to effectively manage our existing products or successfully introduce new or improved products or indications on a timely basis, our business, results of operations, financial condition, and cash flows could be materially adversely affected.

Even if we successfully develop, manufacture, and obtain regulatory approval for new products or new indications for existing products, commercial success is not assured. Market acceptance of our products depends on numerous factors, including the availability and clinical positioning of competing products, the breadth of indications for which competitors’ products are approved, relative pricing, timing of market entry, our ability to enter into favorable commercial agreements, the effectiveness of our sales and distribution efforts, overall market conditions, and our ability to obtain and maintain adequate coding, coverage, and reimbursement, including the availability of TPT Status.

The diagnostic medical imaging market is highly dynamic. New imaging agents, equipment, software, and diagnostic modalities are continually being developed, and existing technologies are frequently refined or displaced. Our diagnostic imaging agents compete not only with other similarly administered agents, but also with agents used in alternative or competing diagnostic modalities. Advances in technology, shifts in clinical preferences, changes in perceptions regarding comparative efficacy, safety, or radiation exposure, or changes in reimbursement methodologies or supplemental payments (including the granting or loss of TPT Status or reimbursement at ASP versus MUC) may favor competing products or modalities and reduce demand for our products. In addition, new or revised appropriate use criteria issued by professional societies may reduce utilization of certain imaging procedures or agents. The development, timing, and adoption of disease‑modifying therapeutics that require or are used in connection with diagnostic imaging may also affect demand for our products. If any of our products become technologically obsolete or are displaced by superior alternatives, we may experience reduced sales volumes or pricing pressure. Lower unit volumes could result in higher per‑unit overhead costs, which could materially adversely affect our business, results of operations, financial condition, and cash flows.

In addition, reliable, comprehensive, and real‑time market data for certain products and indications is limited. As a result, we rely on a combination of historical sales data, information provided by third‑party manufacturing and distribution partners, third‑party medical claims data, primary market research, and other publicly available information to estimate market size, assess trends, and make strategic decisions. These assessments require assumptions that may be inaccurate, incomplete, or untimely. If our assumptions regarding market size, growth, adoption rates, or competitive dynamics are incorrect, we may make strategic or investment decisions—such as those relating to resource allocation, geographic expansion, or commercialization strategy—that fail to achieve their intended results, which could materially adversely affect our business, results of operations, financial condition, and cash flows.

The successful launch of a new pharmaceutical product is inherently uncertain, requires significant upfront investment and advance planning, and depends on coordinated execution across multiple functions. Product launches require accurate demand forecasting, reliable and timely product supply across complex manufacturing and distribution networks, effective educational and promotional efforts, and the timely achievement of favorable reimbursement and coverage decisions from payors. These activities involve substantial judgment and are subject to factors that are difficult to predict. If we misjudge demand, experience supply chain disruptions, fail to effectively educate healthcare providers, or are unable to secure timely and adequate reimbursement or coverage, a product launch may be delayed, adoption may be limited, or utilization may fall short of expectations. Because product launches involve significant upfront expenditures, delays or execution failures may be costly or difficult to remediate and could materially adversely affect our business, results of operations, financial condition, and cash flows.

We may be adversely affected by prevailing economic conditions and financial, business and other factors beyond our control.

Our ability to attract and retain employees and customers, to invest in and grow our business, to maintain our desired levels of costs of goods sold and operating expenses and to meet our financial obligations depends on our operating and financial performance, which, in turn, is subject to numerous factors, including the prevailing economic conditions, changes to financial, business and regulatory expectations, and other factors beyond our control, such as the rate of unemployment, the number of uninsured persons in the United States, inflationary pressures, escalating prices, including those that may occur as a result of tariff policies. We cannot anticipate all the ways in which the current or future economic climate, financial market conditions and government actions could adversely impact our business. We are exposed to risks associated with reduced profitability and the potential financial instability of our customers, many of which may be adversely affected by conditions in the financial markets. For example, unemployment and underemployment, and the resultant loss of insurance, may decrease the demand for healthcare services and pharmaceuticals, including our products. If fewer patients are seeking medical care because they do not have insurance coverage, our customers may experience reductions in revenues, profitability and/or cash flow that could lead them to modify, delay or cancel orders for our products or seek lower cost alternatives to our products where available. If customers are not successful in generating sufficient revenue, are precluded from securing financing from the financial markets, or lose or cannot secure funding from the government, they may not be able to pay, or may delay payment of, accounts receivable that are owed to us. Research programs that could benefit from our investigational or commercial products may slow or be discontinued if funding cannot be secured or is withdrawn, which could delay when the results of such research becomes available and when or how often our products are purchased by third parties for use in their research programs. This, in turn, could adversely affect our business, results of operations, financial condition and cash flows. To the extent prevailing economic conditions result in fewer procedures being performed or fewer research programs being completed, our business, results of operations, financial condition and cash flows could be adversely affected.

In addition, we would expect our costs of goods sold and other operating expenses to change in the future in line with periodic inflationary changes. Because we intend to retain and continue to use our property and equipment, we believe that the incremental inflation related to the replacement costs of those items will not materially affect our operations. However, the rate of inflation affects our expenses, such as those for employee compensation, contract services, and transportation costs, which could increase our level of expenses and the rate at which we use our resources. Similarly, our operations and supply chain may subject us to tariffs and trade policies. For example, the U.S. government has increased, and has indicated a willingness to continue to increase, the use of tariffs by the United States. Such tariffs and any countermeasures taken by other countries could increase the cost of raw materials, components and equipment necessary for our operations, disrupt our global supply chain, create additional operational challenges or adversely impact our customers and business partners. While we generally believe that we will be able to offset the effect of inflationary and other changes by adjusting our product prices and implementing operating efficiencies, any material unfavorable changes in our costs of goods sold or other operating expenses, including from tariffs, could have a material adverse effect on our financial condition, results of operations and cash flows.

An interruption in our ability to fulfill our obligations as a service provider or supplier to third parties, either through our contract development and manufacturing operations and/or in supplying our commercial or investigational products in support of research programs being conducted by third parties, may adversely affect our reputation and business.

We have obligations to perform development and manufacturing services for third parties that have contracted with Evergreen for these services. These services are conducted out of a single location. Any disruption in our operations, any failure to timely and cost-effectively secure necessary personnel, components or materials, any failure to comply with the stringent regulations and requirements of the FDA and other regulatory authorities regarding the manufacture and development of radiopharmaceutical products, may cause us to fail to meet our contractual obligations and may adversely affect our business.

We also have contractual commitments to supply our investigational products and certain of our commercial products to third parties as part of their own research programs. Our ability to supply these products may depend upon the ability of PMFs to manufacture the products to meet the requirements of each research program, including that the product be available at the specific time of day required by the third-party’s research protocol, which may include locations both within and outside of the United States. We may have limited alternative PMF facilities in certain locations in the event one or more facility is unable to timely manufacture and supply the relevant products, and it may not be possible to timely manufacture the relevant products at required levels or at all, which may cause us to fail to meet our contractual obligations and may adversely affect our business and our reputation. These third-party research programs could be discontinued, which could adversely affect our business, results of operations, financial condition and cash flows.

Our recent acquisitions, dispositions and other future strategic transactions may disrupt our ongoing business and create distractions for our management. Additionally, the risks related to these transactions, including the risk that we are unable to successfully integrate acquired businesses into our operations, the risk that we are unable to support transitional services associated with dispositions or on the anticipated timeline, or at all, or are unable to realize the anticipated benefits that each transaction is predicted to bring, could adversely affect our business, results of operations, financial condition and cash flows.

As a part of our growth strategy, we have made and may continue to make selected acquisitions of complementary businesses, such as our recent acquisitions of Life Molecular in July 2025 and Evergreen in April 2025. In addition, as part of our broader strategy, in May 2025, we announced that we had entered into a definitive agreement to sell our single-photon emission computerized tomography (“SPECT”) business to SHINE Technologies, LLC (“SHINE”), and we subsequently completed that disposition on January 1, 2026. These transactions, in addition to advancing our existing pipeline and focusing our operations, create multiple competing interests that are complex and time-consuming, which may distract our management and disrupt our ongoing business.

Our completed and any potential future acquisitions involve numerous risks and operational, financial, and managerial challenges, including the following, any of which could adversely affect our business, results of operations, financial condition and cash flows:

In addition, the successful integration of acquired businesses requires significant efforts and expense across all operational areas, including R&D, manufacturing, sales and marketing, finance, legal, and information technologies. There can be no assurance that any of our acquisitions will be successful or will be, or will become or remain, profitable. Our failure to successfully address the foregoing risks may prevent us from achieving the anticipated benefits from any acquisition in a reasonable time frame, or at all.

Further, the disposition of our SPECT business to SHINE included providing certain transition services to SHINE for a period of time following the closing. Such transition services have been and may continue to be time consuming, and may distract personnel providing those services, including our management and disrupt our ongoing business. Additionally, there may be unforeseen expenses related to this divestiture, or we may fail to realize the expected benefits of this transaction, including potential future payments, which could adversely affect on our financial condition, results of operations and cash flows.

Our future growth may depend on our ability to identify and acquire or in-license additional products, businesses or technologies, and if we do not successfully do so, we may have limited growth opportunities and it could result in significant impairment charges or other adverse financial consequences.

We seek to acquire or in-license products, businesses or technologies that we believe are a strategic fit with our business strategy. Future acquisitions or in-licenses, however, may entail numerous operational and financial risks, including:

We may not have sufficient resources to identify and execute the acquisition or in-licensing of third-party products, businesses and technologies and integrate them into our current infrastructure. In particular, we may compete with larger pharmaceutical companies and other competitors in our efforts to establish new collaborations and in-licensing opportunities. These competitors likely will have access to greater financial resources than we do and may have greater expertise in identifying and evaluating new opportunities. Furthermore, there may be an overlap between our products or customers and the companies which we acquire that may create conflicts in relationships or other commitments detrimental to the integrated businesses. Additionally, the time between our expenditures to acquire or in-license new products, technologies or businesses and the subsequent generation of revenues from those acquired products, technologies or businesses (or the timing of revenue recognition related to licensing agreements and/or strategic collaborations) could cause fluctuations in our financial performance from period to period. Finally, if we devote resources to potential acquisitions or in-licensing opportunities that are never completed, or if we fail to realize the anticipated benefits of those efforts, we could incur significant impairment charges or other adverse financial consequences.

Challenges with product quality or product performance, including defects, caused by us or our manufacturers or suppliers could result in a decrease in customers and revenues, unexpected expenses and loss of market share.

The manufacture of our products is highly exacting and complex and must meet stringent quality requirements, due in part to strict regulatory requirements, including the FDA’s cGMPs. Problems may be identified or arise during manufacturing, quality review, packaging or shipment for a variety of reasons including equipment malfunction, failure to follow specific protocols and procedures, defective raw materials and environmental factors. Additionally, manufacturing flaws, component failures, design defects, off-label uses or inadequate disclosure of product-related information could result in an unsafe condition or the injury or death of a patient. Those events could lead to a recall of, or issuance of a safety alert relating to, our products or could harm our reputation and our ability to market our products in the future. We also may undertake voluntarily to recall products or temporarily shut down production lines based on internal safety and quality monitoring and testing data.

Quality, regulatory and recall challenges could cause us to incur significant costs, including costs to replace products, lost revenue, damage to customer relationships, time and expense spent investigating the cause and costs of any possible settlements or judgments related thereto and potentially cause similar losses with respect to other products. These challenges could also divert the attention of our management and employees from operational, commercial or other business efforts. If we deliver products with defects, or if there is a perception that our products or the processes related to our products contain errors or defects, we could incur additional recall and product liability costs, and our credibility and the market acceptance and sales of our products could be materially adversely affected. Due to the strong name recognition of our brands, an adverse event involving one of our products could result in reduced market acceptance and demand for all products, and could harm our reputation and our ability to market our products in the future. In some circumstances, adverse events arising from or associated with the design, manufacture or marketing of our products could result in the suspension or delay of regulatory reviews of our applications for new product approvals. These challenges could have a material adverse effect on our business, results of operations, financial condition and cash flows.

In the ordinary course of business, we may be subject to product liability claims and lawsuits, including potential class actions, alleging that our products have resulted or could result in an unsafe condition or injury.

Any product liability claim brought against us, with or without merit, could be time consuming and costly to defend and could result in an increase of our insurance premiums and cause reputational harm. Although we have not had any such claims to date, claims that could be brought against us might not be covered by our insurance policies. Furthermore, although we currently have product liability insurance coverage with policy limits that we believe are customary for pharmaceutical companies in the diagnostic medical imaging industry and adequate to provide us with insurance coverage for foreseeable risks, even where the claim is covered by our insurance, our insurance coverage might be inadequate and we would have to pay the amount of any settlement or judgment that is in excess of our policy limits. We may not be able to obtain insurance on terms acceptable to us or at all, since insurance varies in cost and can be difficult to obtain. Our failure to maintain adequate insurance coverage or successfully defend against product liability claims could have a material adverse effect on our business, results of operations, financial condition and cash flows.

We use hazardous materials in our business and must comply with environmental laws and regulations, which can be expensive.

Our operations use hazardous materials and produce hazardous wastes, including radioactive, chemical and, in certain circumstances, biological materials and wastes. We are subject to a variety of federal, state and local laws and regulations, as well as non-U.S. laws and regulations relating to the transport, use, handling, storage, exposure to and disposal of these materials and wastes. Environmental laws and regulations are complex, change frequently and have generally become more stringent over time.

We are required to obtain, maintain and renew various environmental permits and nuclear licenses. Although we believe that our safety procedures for transporting, using, handling, storing and disposing of, and limiting exposure to, these materials and wastes comply in all material respects with the standards prescribed by applicable laws and regulations, the risk of accidental contamination or injury cannot be eliminated. We place a high priority on these safety procedures and seek to limit any inherent risks. We generally contract with third parties for the disposal of wastes generated by our operations. We store low level radioactive waste at our facility and dispose of the materials in accordance with applicable laws and regulations. A majority of our low level radioactive waste is held to decay until materials are no longer considered radioactive. Although we believe we have complied in all material respects with all applicable environmental, health and safety laws and regulations, we cannot assure you that we have been or will be in compliance with all such laws at all times. If we violate these laws, we could be fined, criminally charged or otherwise sanctioned by regulators. We may be required to incur further costs to comply with current or future environmental and safety laws and regulations. In addition, in the event of accidental contamination or injury from these materials, we could be held liable for any damages that result and any such liability could exceed our resources.

While we have budgeted for current and future capital and operating expenditures to maintain compliance with these laws and regulations, we cannot assure you that our costs of complying with current or future environmental, health and safety laws and regulations will not exceed our estimates or adversely affect our results of operations and financial condition. Further, we cannot assure you that we will not be subject to additional environmental claims for personal injury, investigation or cleanup in the future based on our past, present or future business activities.

Our business is subject to international economic, political and other risks that could negatively affect our results of operations or financial position.

For the year ended December 31, 2025, we derived approximately 5.4% of our revenues and sourced approximately 12.0% of our costs of goods sold outside of the United States. Accordingly, our business is subject to risks associated with doing business internationally, including:

These factors are beyond our control. The realization of any of these or other risks associated with operating outside the United States, including the need to import materials from outside the United States to produce our products, could have a material adverse effect on our business, results of operations, financial condition and cash flows.

We face currency and other risks associated with international sales.

We generate revenue from export sales, as well as from operations conducted outside the United States. Operations outside the United States expose us to risks including fluctuations in currency values, trade restrictions, tariff and trade regulations, U.S. export controls, U.S. and non‑U.S. tax laws, shipping delays and economic and political instability. For example, violations of U.S. export controls, including those administered by the U.S. Treasury Department’s Office of Foreign Assets Control, could result in fines, other civil or criminal penalties and the suspension or loss of export privileges which could have a material adverse effect on our business, results of operations, financial conditions and cash flows.

Our business depends on the continued effectiveness and availability of our information technology infrastructure, and failures of this infrastructure could harm our operations.

To remain competitive in our industry, we must employ information technologies to collect and analyze data and to support manufacturing processes, quality processes, ordering requirements and preferences, distribution, research and development, regulatory applications, commercialization efforts and strategic planning to capture, manage and analyze large streams of data in compliance with applicable regulatory requirements. While we rely extensively on technology, some of which is managed by third-party service providers, to allow the concurrent conduct of work sharing around the world, all aspects of our business are not automated and we cannot eliminate all potential risks associated with our information technology systems, including those associated with introducing new systems, processes or data. As with all information technology, our equipment and infrastructure age and become subject to increasing maintenance and repair and our systems generally are vulnerable to potential damage or interruptions from fires, natural disasters, power outages, blackouts, machinery breakdown, telecommunications failures and other unexpected events, as well as to break-ins, sabotage, increasingly sophisticated intentional acts of vandalism or cybersecurity threats which, due to the nature of such attacks, may remain undetected for a period of time. In addition, a failure to adopt evolving technologies could introduce risk as legacy systems may be incompatible with newer technologies introduced to our systems or become less effective, inefficient to sustain and potentially obsolete. As these threats continue to evolve, we may be required to expend additional resources to enhance our information security measures or to investigate and remediate any information security vulnerabilities. Given the extensive reliance of our business on technology, including reliance on third-party service providers, any failure to adhere to robust security practice or any substantial disruption or resulting loss of data that is not avoided or either corrected by our backup measures or other means, could result in legal liability, harm our business, reputation, operations and financial condition.

Our use of artificial intelligence (“AI”) or other emerging technologies could adversely affect our business, results of operations, financial condition and cash flows.

We deploy AI and other emerging technologies in various facets of our operations and we continue to explore further use cases for AI. The rapid advancement of these technologies presents opportunities for us in research, manufacturing, commercialization, and other business activities but also entails risks, including that AI-generated content, analyses, or recommendations we utilize could be deficient, or that our competitors may more quickly or effectively adopt AI capabilities. Our use of AI or other emerging technologies could also exacerbate regulatory, cybersecurity and other significant risks, all of which could adversely affect our business, results of operations, financial condition and cash flows.

A disruption in our computer networks, including those related to cybersecurity, could adversely affect our business, results of operations, financial condition and cash flows.

We believe that our cybersecurity program is designed to effectively mitigate the risks of material cybersecurity incidents. However, our management does not expect that our cybersecurity program will prevent or detect all occurrences of cybersecurity incidents, material or otherwise, and there is potential risk that certain cybersecurity breaches may go undetected for a period of time. The design of our cybersecurity program is based, in part, upon certain assumptions about the likelihood of future incidents, and there can be no assurance that any design will prevent or detect all cybersecurity breaches. Over time, certain aspects of cybersecurity programs may become inadequate because of changes in technology, sophistication of cybersecurity attacks, emerging threats or other conditions, or the degree of compliance with our policies and procedures may deteriorate.

We rely on our computer networks and systems, some of which are managed by third parties, to manage and store electronic information (including sensitive data such as confidential business information, personally identifiable data and personal health information), and to manage or support a variety of critical business processes and activities. We may face threats to our networks from unauthorized access, security breaches and other system disruptions. Despite our security measures, our infrastructure may be vulnerable to external or internal attacks. Any such security breach may compromise information stored on our networks and may result in significant data losses or theft of sensitive or proprietary information. A cybersecurity breach could hurt our reputation by adversely affecting the perception of customers and potential customers about the security of their orders and personal information, as well as the perception of our manufacturing partners of the security of their proprietary information. In addition, a cybersecurity attack could result in other negative consequences, including disruption of our internal operations, increased cybersecurity protection costs, lost revenue, regulatory actions or litigation. Any disruption of internal operations could adversely affect our business, results of operations, financial condition and cash flows. To date, we have not experienced any known material cybersecurity attacks.

We may be limited in our ability to utilize, or may not be able to utilize, net operating loss carryforwards to reduce our future tax liability.

As of December 31, 2025, we had U.S. federal income tax loss carryforwards of $281.4 million, $108.2 million of which will expire between 2029 and 2037, $173.2 million of which can be carried forward indefinitely, foreign net operating losses of $76.3 million, $3.9 million of which expire between 2032 and 2035 and $72.4 million of which can be carried forward indefinitely, and state income tax loss carryforwards of $9.2 million, tax-effected. We may be limited in our ability to use these tax loss carryforwards to reduce our future income tax liabilities if our future income is not sufficient to absorb the losses. Additionally, we may be limited in our ability to use our U.S. federal and state tax loss carryforwards or if we were to experience another “ownership change” as specified in Section 382 of the Internal Revenue Code including if we were to issue a certain amount of equity securities, certain of our stockholders were to sell shares of our common stock, or we were to enter into certain strategic transactions.

Risks Related to Our and our Strategic Partners’ Portfolios of Clinical Development Candidates

We may not, or may take longer to, realize the expected benefits and opportunities related to, investments we have made to develop our new formulation of our prostate-specific membrane antigen (“PSMA”) PET Imaging Agent.

In August 2025, we announced that the FDA had accepted our New Drug Application (“NDA”) for a new formulation of our F-18 PSMA PET imaging agent, filed by our subsidiary Aphelion, and that the FDA set a Prescription Drug User Fee Act (“PDUFA”) target action date of March 6, 2026. The new formulation was designed to enhance product stability and increase batch production, with the potential to enhance supply flexibility and improve operating leverage across the network. If the NDA is approved, we plan to work closely with clinicians and PMF sites to ensure a smooth rollout of the new formulation, including providing clear guidance on ordering, handling, and clinical use to support continuity of care for patients, and we plan to apply for CMS reimbursement for the new formulation, including seeking three years of TPT Status; however, we can provide no assurance that the new formulation will be approved by the FDA, that we will meet our timeline for our planned rollout, or that we will obtain TPT Status. Even if we do receive NDA approval, all of the risks described above with respect to our ability to continue to generate substantial revenue from PYLARIFY, as well as the risk associated with launching a product, would also apply to our new formulation of our PSMA PET imaging agent, and we can provide no assurances that the anticipated increase in batch size or other expected improvements associated with the design of the new formulation will be realized or be viewed in the market as differentiating factors.

We may not, or may take longer to, realize the expected benefits and opportunities related to our acquisition of the rights to LNTH-2501.

In April 2025, we acquired Evergreen, including the rights to LNTH-2501. On October 30, 2025, we announced that the FDA had accepted our NDA for LNTH-2501 and has set a PDUFA target action date of March 29, 2026, but we can provide no assurance that LNTH-2501 will be approved by the FDA based on the data submitted or, if approved, that we will be successful in gaining post-approval market acceptance and adequate coding, coverage, and payment for LNTH-2501 or that our manufacturer will be able to successfully develop and scale the manufacturing capabilities to support the launch of LNTH-2501. Even if we do receive NDA approval, all of the risks described above with respect launching a product would apply to LNTH-2501. Additionally, LNTH-2501 is a kit product with a supply chain that differs from that of our other commercial products which may introduce additional operational complexity, coordination requirements, sourcing and supply risks, and we can provide no assurance that we will be able to successfully or timely launch LNTH-2501, achieve anticipated adoption, or realize expected commercial results.

We may not, or may take longer to, realize the expected benefits and opportunities related to, investments we have made to develop diagnostic product candidates to be used in diagnosing, staging and monitoring Alzheimer’s disease.

As part of our acquisition of Life Molecular, we acquired LNTH-2620, a next-generation radioactive tracer used in PET scans to detect and visualize tau protein tangles in the brain, a key biomarker for Alzheimer’s disease and other neurodegenerative disorders. LNTH-2620 is currently in a Phase 3 study.

During 2024, we acquired Meilleur, which holds the rights under a license agreement to develop and commercialize NAV-4694, an investigational late-stage F-18-labeled PET imaging agent that targets beta amyloid in Alzheimer’s disease. NAV-4694 is currently in Phase 3 development and is also being used in academic and industry sponsored clinical trials.

Previously, we acquired MK-6240, which is a registrational stage F-18-labeled PET imaging agent that targets tau tangles. In October 2025, we announced that the FDA had accepted our NDA for MK-6240 and has set a PDUFA target action date of August 13, 2026, but we can provide no assurance that MK-6240 will be approved by the FDA based on the data submitted or, if approved, that we will be successful in commercializing MK-6240.

While we believe that both MK-6240 and LNTH-2620, as tau imaging agents, and NAV-4694, as a beta amyloid imaging agent, have the potential to expand our Neurology franchise that also includes Neuraceq and play an important role in diagnosing, staging and monitoring Alzheimer’s disease, we can give no assurance that we will be successful with continued development,

regulatory approval and commercialization of these product candidates or that disagreements with the counterparties to our license agreements or the former stockholders of the companies we acquired who could receive future milestone and royalty-based payments will not arise, including disagreements over proprietary rights, contract interpretation or the preferred course of product research, development or marketing that might cause delays or termination of the license agreements, or might result in litigation or arbitration, which could be time-consuming and expensive. In addition, the successful acceptance and use of these diagnostic product candidates will depend on the successful development by pharmaceutical companies of disease-modifying treatments for Alzheimer’s disease, as well as the inclusion of our product candidates in the prescribing information or guidelines for such disease-modifying treatments.

We may not, or may take longer to, realize the expected benefits and opportunities related to, the POINT Biopharma Global Inc. (“POINT”) License Agreements.

On December 20, 2022, we announced the closing of a set of strategic collaborations with an affiliate of POINT, in which we were granted a license to exclusive worldwide rights (excluding Japan, South Korea, China (including Hong Kong, Macau and Taiwan), Singapore and Indonesia) to co-develop and commercialize POINT’s PNT2003 and PNT2002 product candidates (the “POINT License Agreements”). The expected benefits and opportunities related to the POINT License Agreements may not be realized or may take longer to realize than expected due to, for example, challenges and uncertainties inherent in product research, development, manufacturing, regulatory approval, marketing and competition. In particular, activities under the POINT License Agreements may not result in viable products suitable for commercialization in a timely manner or at all, due to a variety of reasons, including any inability of the relevant parties to perform their commitments and obligations under the POINT License Agreements. The POINT License Agreements impose various development, regulatory filing, commercialization and other obligations on us, and require us to meet development timelines or to exercise commercially reasonable efforts to develop and commercialize licensed products. We, along with our counterparty in the POINT License Agreements, may not be able to meet expected or planned regulatory milestones and timelines due to a number of factors, including, with respect to PNT2003, the PNT2003 Litigation, which could postpone FDA approval for up to 30 months or result in us being further delayed in launching PNT2003 or requiring us to seek a license for intellectual property rights. Even if the licensed products are suitable for commercialization in a timely manner, we may not achieve the expected revenues from the sale of such products, and our revenue, ability to achieve profitability and return on investment may be adversely affected. We are also dependent on POINT to develop commercial product capacity and manufacture for both PNT2003 and PNT2002.

Disagreements with POINT in the POINT License Agreements over proprietary rights, contract interpretation or the preferred course of product research, development, regulatory strategy or marketing, might cause delays in performance of the POINT License Agreements or termination of the POINT License Agreements, or might result in litigation or arbitration, which could be time-consuming and expensive.

Additionally, if we fail to comply with our obligations under the POINT License Agreements, then POINT may conclude that we have materially breached and may terminate one or both of the POINT License Agreements, in which event we may lose our rights to develop and market PNT2003 and PNT2002 or incur liability for damages.

The Phase 3 registrational clinical trial for PNT2002, known as the “SPLASH” study, reached 100% of prespecified overall survival events. The results of the readout were comparable to the previously reported 46% and 75% readouts and remain confounded by the overwhelming number of patients who crossed over within the study to receive PNT2002. While we continue to review the available PNT2002 data, we do not currently plan to pursue an NDA or further invest in this asset, as a result, we may never realize future benefits from the related POINT License Agreement.

Any of the foregoing risks could have a material adverse effect on our business, results of operations, financial condition and cash flows.

The process of developing new drugs and obtaining regulatory approval is complex, time-consuming and costly, and the outcome is not certain.

We currently have pre-clinical and clinical development programs and are exploring additional lifecycle management opportunities for some of our current products, including PYLARIFY and Neuraceq. To obtain regulatory approval for these products, we may need to conduct extensive human tests, which are referred to as clinical trials, as well as meet other rigorous regulatory requirements, as further described in Part I, Item 1. “Business—Regulatory Matters” to this Form 10-K. In connection with our ongoing development activities, we currently depend, and expect to continue to depend, on numerous third parties, including contract research organizations, clinical trial investigators and contract manufacturing organizations. If any of these service providers breach or terminate its agreement with us or otherwise fail to conduct the service for which it is responsible successfully and in a timely and compliant manner, the development or commercialization of the affected product candidate or research program could be delayed or terminated. In addition, oversight of third-party service providers can be costly and time-consuming and could divert management’s and other personnel’s time and attention,

Satisfaction of all regulatory requirements to successfully obtain regulatory approval for a new product typically takes many years and requires the expenditure of substantial resources. A number of other factors may cause significant delays in the completion of our development programs and clinical trials, including unexpected delays in the initiation of clinical sites, slower

than projected enrollment, competition with ongoing clinical trials and scheduling conflicts with participating clinicians, regulatory requirements, limits on manufacturing capacity and failure of an investigational product to meet required standards for administration to humans. In addition, it may take longer than we project to achieve study endpoints and complete data analysis for a clinical trial, or we may decide to slow down the enrollment in a trial in order to conserve financial resources or for other reasons.

Our products in development are also subject to the risks of failure inherent in drug development, drug testing and regulatory approval. The results of preliminary studies do not necessarily predict clinical success, and larger and later stage clinical trials may not produce the same results as earlier stage trials. Sometimes, products that have shown promising results in early clinical trials have subsequently suffered significant setbacks in later clinical trials. Products in later stage clinical trials may fail to show desired safety and efficacy traits, despite having progressed through initial clinical testing. In addition, the data collected from clinical trials of our products in development may not be sufficient to support regulatory approval, or regulators could interpret the data differently and less favorably than we do. Further, the design of a clinical trial can determine whether its results will support approval of a product, and flaws in the design of a clinical trial may not become apparent until the clinical trial is well advanced. Clinical trials of potential products often reveal that it is not practical or feasible to continue development efforts. Regulatory authorities may require us or our partners to conduct additional clinical testing, in which case we would have to expend additional time and resources. Depending on the regulatory pathway selected for drug approval, such as by filing an ANDA or Section 505(b)(2) NDA that requires sending notice to the innovator of a drug, regulatory approval may also be delayed by litigation brought under the Hatch-Waxman Act, which is the case for the approval pathway for PNT2003, currently subject to the PNT2003 Litigation. The approval process may also be delayed by changes in government regulation, future legislation or administrative action or changes in regulatory policy that occur prior to or during regulatory review. The failure to provide clinical and preclinical data that are adequate to demonstrate to the satisfaction of the regulatory authorities that our products in development are safe and effective for their proposed use will delay or preclude approval and will prevent us from marketing those products.

We are not permitted to market our products in development in the United States or other countries until we have received requisite regulatory approvals. For example, securing FDA approval for a new drug requires the submission of an NDA to the FDA for our products in development. The NDA must include extensive non-clinical and clinical data and supporting information to establish the product’s safety and effectiveness for each indication. The NDA must also include significant information regarding the chemistry, manufacturing and controls for the product. The FDA review process can take many years to complete, and approval is never guaranteed. If a product is approved, the FDA may limit the indications for which the product may be marketed, require extensive warnings on the product labeling, impose restricted distribution programs, require expedited reporting of certain adverse events, or require costly ongoing requirements for post-marketing clinical trials and surveillance or other risk management measures to monitor the safety or efficacy of the product. In some instances, products in development may also be approved by filing an ANDA or Section 505(b)(2) NDA with the FDA (as further described in Part I, Item 1. “Business—Regulatory Matters—Hatch-Waxman Act” of this Form 10-K); provided, however, that seeking regulatory approval under such pathways may subject the product candidate to litigation brought by an innovator of similar drugs under the Hatch-Waxman Act, as is the case with the PNT2003 Litigation. Markets outside of the United States also have requirements for approval of products with which we must comply prior to marketing. Obtaining regulatory approval for marketing of a product in one country does not ensure we will be able to obtain regulatory approval in other countries, but a failure or delay in obtaining regulatory approval in one country may have a negative effect on the regulatory process in other countries. Also, any regulatory approval of any of our products in development, once obtained, may be withdrawn. Approvals might not be granted on a timely basis, if at all.

Even if clinical development candidates receive regulatory approval, we can give no assurance that they can be successfully commercialized.

Even if we or our partners’ clinical development candidates proceed through their clinical trials and ultimately receive regulatory approval, there is no guarantee that an approved product can be manufactured in commercial quantities at a reasonable cost or that such a product will be successfully marketed or distributed. For example, although our licensee, GE Healthcare, has received FDA approval of Flyrcado (flurpiridaz F-18) for coronary artery disease diagnosis, there is no guarantee that GE Healthcare will continue to be successful in its commercialization of Flyrcado, which may delay or prevent us from being able to generate additional future royalty revenue from product sales. Additionally, the manufacturing, marketing and distribution of an F-18-based radiopharmaceuticals like Flyrcado, as well as our investigational products, such as MK-6240, NAV-4694 and LNTH-2620, will require the further leveraging of a field-based network of specialized PMFs, with radioisotope-producing cyclotrons, which we use for PYLARIFY and Neuraceq, and will need to be manufactured and distributed rapidly to end-users. We can give no assurance that additional PMF sites will have the capacity to produce products in addition to the products they may already produce, including other F-18-based products, that those PMF sites will be willing to commit to manufacture new products or that they can successfully complete the technology transfer process necessary to manufacture new products and to obtain necessary regulatory approvals.

In addition, obtaining adequate coding, coverage, and payment at appropriate payment levels for any clinical development candidate will be critical, including not only coverage from Medicare, Medicaid, and other government payors, but also from private payors. We can give no assurance, even if a clinical development candidate were to obtain regulatory approval, that adequate coding, coverage and payment could be secured to allow the approved products to become successfully commercialized.

Further, our ability to accurately forecast demand to support the launch of new products, including variations in demand across geographic regions, is limited, and errors in forecasting could adversely affect our business, results of operations, financial condition and cash flows. Demand for our products may differ materially from our current expectations due to factors that are difficult to predict, including customer adoption rates, purchasing patterns, competitive offerings, pricing dynamics, reimbursement or regulatory considerations, and broader market conditions. The commercialization of our products relies on production across multiple manufacturing sites located in different regions of the United States. To meet anticipated customer demand, we must maintain appropriate levels of raw materials and manufacturing capacity at each of these sites. Accurately aligning regional demand forecasts with inventory levels across multiple locations requires complex planning and coordination, and any errors in forecasting or execution could result in excess or insufficient inventory at one or more sites. If we overestimate demand in a particular region, we may incur increased carrying costs, write‑downs or obsolescence of raw materials or finished goods, and inefficiencies in our manufacturing operations. Conversely, if we underestimate demand, we may experience supply shortages, production delays, missed sales opportunities, strained customer relationships, or damage to our reputation. In addition, shifting inventory or production capacity between sites may not be feasible on a timely or cost‑effective basis. Any of these outcomes could increase our costs, reduce our margins, delay or limit the successful adoption of the product, and materially and adversely affect our business, results of operations, and financial condition.

In addition, the successful acceptance and use of our diagnostic product candidates may depend in part on the successful development by pharmaceutical companies of disease-modifying treatments for the disease areas in which our product candidates are intended to be used, as well as the inclusion of our product candidates in the prescribing information or guidelines for such disease-modifying treatments.

We have been and expect to continue to be dependent on partners for the development of certain product candidates, which expose us to the risk of reliance on these partners.

In connection with our ongoing development activities, we currently depend, and expect to continue to depend, on numerous collaborators. For example, in addition to our collaboration with Curium on PYLCLARI in Europe, GE Healthcare on Flyrcado in the United States and piflufolastat in Japan and POINT on PNT2003, we have other collaborations to develop and commercialize products. In addition, certain clinical trials for our product candidates may be conducted by government-sponsored agencies, and consequently will be dependent on governmental participation and funding. These arrangements expose us to the same considerations we face when contracting with third parties for our own trials.

If any of our collaborators breach or terminate its agreement with us or otherwise fail to conduct successfully and in a timely manner the collaborative activities for which they are responsible, the preclinical or clinical development or commercialization of the affected product candidate or research program could be delayed or terminated. We generally do not control the amount and timing of resources that our collaborators devote to our programs or product candidates. We also do not know whether current or future collaboration partners, if any, might pursue alternative technologies or develop alternative products either on their own or in collaboration with others, including our competitors, as a means for developing treatments for the diseases or conditions targeted by our collaborative arrangements. Our collaborators are also subject to similar development, regulatory, manufacturing, cyber-security and competitive risks as us, which may further impede their ability to successfully perform the collaborative activities for which they are responsible. Setbacks of these types to our collaborators could have a material adverse effect on our business, results of operations, financial condition and cash flows.

We depend on licenses from third parties for our rights to existing commercial products and to develop and commercialize certain product candidates. If we fail to achieve milestone requirements or to satisfy other conditions or otherwise have disagreements with those third parties, we may lose those rights under those license agreements, and our business, results of operations and financial condition could be adversely affected.

Many of our products or product candidates incorporate rights licensed by third parties, including, but not limited to patent rights on PYLARIFY, Neuraceq, PNT2003, MK-6240 and NAV-4694. Disagreements with licensors over proprietary rights, contract interpretation or the preferred course of product research, development, regulatory strategy or marketing, might cause delays in performance under the applicable license agreements or termination of the license agreement, or might result in litigation or arbitration, which could be time-consuming and expensive. In addition, we are required to make substantial cash payments, achieve milestones and satisfy other conditions, including filing for and obtaining marketing approvals and introducing products, sometimes in accordance with established timelines, to maintain rights under our license agreements. Due to the nature of these agreements and the uncertainties of development, we may not be able to achieve milestones or satisfy conditions to which we have contractually committed, and as a result may be unable to maintain our rights under these licenses. If we do not comply with our license agreements, the licensors may seek to terminate them, which could result in our losing our rights to, and therefore being unable to commercialize, related products. This loss or any sustained disagreement with a licensor could have a material adverse effect on our business, results of operations, financial condition and cash flows.

Risks Related to Our Capital Structure

Repurchases by us of our common stock may affect the value of our common stock and reduces cash available for other purposes.

We have from time to time engaged in repurchase programs of our common stock. In July 2025, our Board of Directors authorized a program to repurchase up to $400.0 million of shares of our common stock through December 31, 2027, via open market purchases, privately negotiated transactions, block trades or pursuant to trades intending to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or through other legally permissible means, depending on market conditions and in accordance with applicable rules and regulations (the “2025 Program”). As of December 31, 2025, we had repurchased a total of approximately 3.5 million shares under the 2025 Program for approximately $200.0 million, and approximately $200.0 million of shares of our common stock remain available for repurchase under the 2025 Program. Such repurchases could increase, or prevent a decrease in, the market price of our common stock, although there can be no assurance that an increase, or prevention of a decrease, would occur, and stockholders could prefer that we allocate our capital in a different manner, which could negatively impact the market price of our common stock.

The conditional conversion feature of the 2.625% Convertible Senior Notes due December 2027, if triggered, may adversely affect our financial condition and operating results.

On December 8, 2022, we issued $575.0 million in aggregate principal amount of 2.625% Convertible Senior Notes due December 2027 (the “Notes”), which included $75.0 million in aggregate principal amount of Notes sold pursuant to the full exercise of the initial purchasers’ option to purchase additional Notes. The Notes were issued under an indenture, dated as of December 8, 2022 (the “Indenture”), among Lantheus Holdings, Lantheus Medical, and U.S. Bank Trust Company, National Association, as Trustee. Prior to the close of business on the business day immediately preceding September 15, 2027, the Notes may be converted at the option of the holders upon occurrence of specified events and during certain periods, and thereafter until the close of business on the business day immediately preceding the maturity date, the Notes may be converted at any time. For example, holders could elect to convert their Notes during a calendar quarter if the trading price of our common stock was greater than or equal to 130% of the conversion price of the Notes (initially $79.81 per share) for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter (the “Stock Price Conversion Threshold”). During the third quarter of 2024, the closing price of the Company’s common stock exceeded the Stock Price Conversion Threshold, so the Notes were convertible at the option of the holders during the fourth quarter of 2024, and, in connection therewith, holders of $4,000 in aggregate principal of Notes elected to convert their Notes, for which we elected to pay cash in consideration of our conversion obligation in excess of the aggregate principal amount of the converted Notes. Since the third quarter of 2024, the closing price of the Company’s common stock has not exceeded the Stock Price Conversion Threshold, so the Notes have not been convertible at the option of the holders of the Notes subsequent to the fourth quarter of 2024. However, if such a right becomes available again and if one or more holders elect to convert their Notes, unless we elect to satisfy our conversion obligation by arranging for one or more financial institutions to take the Notes from converting holders and pay such holders in accordance with the Indenture, we would be required to settle any converted principal amount of such Notes through the payment of cash and by paying or delivering, at our election, cash, shares of our common stock, or a combination of cash and shares, with respect to the remainder of our conversion obligation in excess of the aggregate principal amount of the Notes being converted, which could adversely affect our liquidity or, if we elect to settle our conversion obligation in excess of the aggregate principal amount of the Notes being converted in shares of common stock (whether in whole or in part), could dilute the ownership interests of our existing common stockholders.

The issuance or sale of shares of our common stock, or rights to acquire shares of our common stock, could depress the trading price of our common stock.

We may conduct future offerings of our common stock, preferred stock or other securities that are convertible into or exercisable for our common stock to finance our operations or fund acquisitions, or for other purposes. In addition, we expect to continue to grant equity awards to directors, officers and employees under our equity incentive plans. If we issue additional shares of our common stock or rights to acquire shares of our common stock, if any of our existing stockholders sells a substantial amount of our common stock, or if the market perceives that such issuances or sales may occur, then the trading price of our common stock may significantly decrease. In addition, our issuance of additional shares of common stock will dilute the ownership interests of our existing common stockholders.

We have indebtedness that may limit our financial and operating activities and may adversely affect our ability to incur additional debt to fund future needs.

As of December 31, 2025, we had approximately $575.0 million of total principal indebtedness remaining under the Notes and availability of $750.0 million under our five-year revolving credit facility, which was amended in December 2024 (as amended, the “2022 Revolving Facility”). The amendment extended the maturity date of the 2022 Revolving Facility to December 19, 2029 and increased the amount available under the 2022 Revolving Facility from $350.0 million to $750.0 million. Our indebtedness and any future indebtedness we incur could:

In addition, our level of indebtedness could limit our ability to obtain additional financing on acceptable terms, or at all, for working capital, capital expenditures and general corporate purposes. Our liquidity needs could vary significantly and may be affected by general economic conditions, industry trends, performance and many other factors outside our control.

We may not be able to generate sufficient cash flow to meet our debt service obligations.

Our ability to generate sufficient cash flow from operations to make scheduled payments on our debt obligations will depend on our future financial performance, which will be affected by a range of economic, competitive and business factors, many of which are outside of our control. If we do not generate sufficient cash flow from operations to satisfy our debt obligations, including interest and principal payments, our credit ratings could be downgraded, and we may have to undertake alternative financing plans, such as refinancing or restructuring our debt, selling assets, entering into additional corporate collaborations or licensing arrangements for one or more of our products in development, reducing or delaying capital investments or seeking to raise additional capital. We cannot assure you that any refinancing would be possible, that any assets could be sold, licensed or partnered, or, if sold, licensed or partnered, of the timing of the transactions and the amount of proceeds realized from those transactions, that additional financing could be obtained on acceptable terms, if at all, or that additional financing would be permitted under the terms of our various debt instruments then in effect. Furthermore, our ability to refinance would depend upon the condition of the financial and credit markets. Our inability to generate sufficient cash flow to satisfy our debt obligations, or to refinance our obligations on commercially reasonable terms or on a timely basis, would have an adverse effect on our business, results of operations and financial condition.

Despite our indebtedness, we may incur more debt, which could exacerbate the risks described above.

We and our subsidiaries may be able to incur substantial additional indebtedness in the future subject to the limitations contained in the agreements governing our debt, including the 2022 Revolving Facility. Although these agreements restrict us and our restricted subsidiaries from incurring additional indebtedness, these restrictions are subject to important exceptions and qualifications. For example, we are generally permitted to incur certain indebtedness, including indebtedness arising in the ordinary course of business, indebtedness among restricted subsidiaries and us and indebtedness relating to hedging obligations. If we or our subsidiaries incur additional debt, the risks that we and they now face as a result of our leverage could intensify. In addition, the 2022 Revolving Facility will not prevent us from incurring obligations that do not constitute indebtedness under that agreement.

Our 2022 Revolving Facility contains restrictions that will limit our flexibility in operating our business.

Our 2022 Revolving Facility contains various covenants that limit our ability to engage in specified types of transactions. These covenants limit our and our restricted subsidiaries’ ability to, among other things:

A breach of any of these covenants could result in a default under the 2022 Revolving Facility. We may also be unable to take advantage of business opportunities that arise because of the limitations imposed on us by the restrictive covenants under our indebtedness.

U.S. credit markets may impact our ability to obtain financing or increase the cost of future financing, including interest rate fluctuations based on macroeconomic conditions that are beyond our control.

During periods of volatility and disruption in the United States, European, or global credit markets, obtaining additional or replacement financing may be more difficult and the cost of issuing new debt or replacing or repaying our 2022 Revolving Facility could be higher than under our current 2022 Revolving Facility. Higher cost of new debt may limit our ability to have cash on hand for working capital, capital expenditures and acquisitions on terms that are acceptable to us. Additionally, our 2022 Revolving Facility has variable interest rates. By its nature, a variable interest rate will move up or down based on changes in the economy and other factors, all of which are beyond our control. If interest rates increase, our interest expense could increase, affecting earnings and reducing cash flows available for working capital, capital expenditures and acquisitions.

Our stock price has fluctuated significantly, which could cause the value of your investment in our common stock to decline, and you may not be able to resell your shares at or above your purchase price.

Securities markets worldwide have experienced, and may continue to experience, significant price and volume fluctuations. This market volatility, as well as general economic, market or political conditions, could reduce the market price of our common stock regardless of our operating performance. The high and low closing sales prices of our common stock during the twelve months ended December 31, 2025 were $110.01 and $50.11, respectively. The trading price of our common stock is likely to be volatile and subject to wide price fluctuations in response to various factors, including:

These and other factors may cause the market price and demand for our common stock to fluctuate substantially, which may limit or prevent investors from readily selling their shares of common stock and may otherwise negatively affect the liquidity of our common stock. In addition, when the market price of a stock is volatile, holders of that stock may institute securities class action litigation against the company that issued the stock, including, as discussed in the risk factor entitled “Our business and operations could be negatively affected by any pending or future securities litigation”.

Our business and operations could be negatively affected by any pending or future securities litigation or claims that we have otherwise engaged in wrongdoing.

We are, and may become in the future, subject to securities class actions, derivative suits or other securities-related legal actions. For example, on September 9, 2025, an alleged stockholder initiated a putative securities class action against us in the United States District Court for the Southern District of New York, styled Margolis v. Lantheus Holdings, Inc., et al. The operative complaint also asserts claims against certain of our named executives. A related action, styled Indiana Pub. Ret. Sys. v. Lantheus Holdings, Inc., et al., was filed in the same court on November 5, 2025. Those actions are now consolidated into a single putative securities class action (captioned In re Lantheus Holdings, Inc. Secs. Litig.), the theory of which is that the defendants made materially false or misleading statements (or omitted material facts) in violation of the Exchange Act. Under the operative scheduling order in the case, the lead plaintiff may file an amended complaint by March 13, 2026. Additionally, on December 17, 2025, another alleged stockholder filed a shareholder derivative action in the same court, styled Lelchuk v. Heino et al., nominally on behalf of the Company and naming as defendants the current directors of our Board and the same officers named in the consolidated securities class action described above (a similar derivative complaint styled Jones v. Markison et al.,

was previously filed on October 31, 2025 but was voluntarily withdrawn without prejudice). The derivative complaint largely repeats the allegations asserted in the consolidated securities class action, and asserts claims for alleged breaches of fiduciary duties, aiding and abetting breach of fiduciary duty, unjust enrichment, waste of corporate assets, and violations of the Exchange Act. The plaintiff seeks damages and other relief on behalf of the Company. Because the outcome of litigation is uncertain, we cannot predict how or when these matters will ultimately be resolved. These actions, or any other stockholder litigation against us, could cause us to incur substantial costs defending the lawsuit. Such a lawsuit could also divert the time and attention of our management from our business, which could significantly harm our profitability and reputation.

If securities or industry analysts do not publish research or reports about our business, if they adversely change their recommendations regarding our stock, or if our results of operations do not meet their expectations, our stock price and trading volume could decline.

The trading market for our common stock will be influenced by the research and reports that industry or securities analysts publish about us or our business. If one or more of these analysts ceases coverage of our company or fails to publish reports on us regularly, we could lose visibility in the financial markets, which in turn could cause our stock price or trading volume to decline. Moreover, if one or more of the analysts who cover us downgrades our stock, or if our results of operations do not meet their expectations, our stock price could also decline.

We do not anticipate paying any cash dividends for the foreseeable future, and accordingly, stockholders must rely on stock appreciation for any return on their investment.

We have never declared or paid cash dividends on our capital stock. We currently intend to retain our future earnings, if any, for the foreseeable future, to repay indebtedness and to fund the development and growth of our business. We do not intend to pay any dividends to holders of our common stock and the agreements governing our senior secured credit facilities limit our ability to pay dividends. As a result, capital appreciation in the price of our common stock, if any, will be your only source of gain on an investment in our common stock.

Anti-takeover provisions in our charter documents and Delaware law and certain provisions in the Notes and Indenture may make an acquisition of us more difficult.

Our amended and restated certificate of incorporation and bylaws, as amended and restated, contain provisions that delay, defer or discourage transactions involving an actual or potential change in control of us or change in our management. These provisions may also discourage bids for our common stock at a premium over market price or adversely affect the market price of, and the voting and other rights of the holders of, our common stock. These provisions could also discourage proxy contests and make it more difficult for stockholders to elect directors other than the candidates nominated by our Board. In addition, we are incorporated in Delaware and subject to the provisions of Section 203 of the Delaware General Corporation Law, which may prohibit large stockholders from consummating a merger with, or acquisition of, us. These provisions may deter an acquisition of us that might otherwise be attractive to stockholders.

Certain provisions in the Notes and the Indenture could make it more difficult or more expensive for a third party to acquire us. For example, if a takeover would constitute a fundamental change, holders of the Notes will have the right to require us to repurchase their Notes in cash. In addition, if a takeover constitutes a make-whole fundamental change, we may be required to increase the conversion rate for holders who convert their Notes in connection with such takeover. In either case, and in other cases, our obligations under the Notes and the Indenture could increase the cost of acquiring us or otherwise discourage a third party from acquiring us or removing incumbent management, including in a transaction that holders of our common stock may view as favorable.

Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

The following table summarizes information regarding our significant leased and owned properties, as of December 31, 2025:

We believe all of these facilities are well-maintained and suitable for the office, manufacturing or warehouse operations conducted in them and provide adequate capacity for current and foreseeable future needs.

Item 3. Legal Proceedings

Information with respect to certain legal proceedings is included in Note 17, “Commitments and Contingencies,” to the consolidated financial statements contained in Part II, Item 8. “Financial Statements and Supplementary Data,” of this Form 10-K and is incorporated herein by reference.

Item 4. Mine Safety Disclosures

Not applicable

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Market Information

Our common stock trades on the NASDAQ Global Market under the symbol “LNTH”.

Holders of Record

On February 23, 2026, there were approximately 28 stockholders of record of our common stock. This number does not include stockholders for whom shares are held in “nominee” or “street” name.

Performance Graph

The performance graph set forth below shall not be deemed “soliciting material” or to be “filed” with the Securities and Exchange Commission. This graph will not be deemed “incorporated by reference” into any filing under the Securities Act of 1933, as amended or the Securities Exchange Act of 1934, as amended, whether such filing occurs before or after the date hereof, except to the extent that we explicitly incorporate it by reference into in such filing.

The following graph provides a comparison of the cumulative total shareholder return on our shares of common stock with that of the cumulative total shareholder return on the (i) Russell 2000 Index, (ii) the NASDAQ US Small Cap Index and (iii) the NASDAQ US Mid Cap Index, commencing on December 31, 2020 and ending December 31, 2025. The graph assumes a hypothetical $100 investment in our common stock and in each of the comparative indices on December 31, 2020. Our historic share price performance is not necessarily indicative of future share price performance.

* Assumes hypothetical investment of $100 in our common stock and each of the indices on December 31, 2020, including reinvestment of dividends.

Performance Graph Data

The following table sets forth the cumulative total shareholder return on the hypothetical $100 investment in our common stock and each of the comparative indices on December 31, 2020:

Dividend Policy

We did not declare or pay any dividends in 2025, and we do not currently intend to pay dividends in the foreseeable future. We currently expect to retain future earnings, if any, for the foreseeable future, to finance the growth and development of our business and to repay indebtedness. Our ability to pay dividends is restricted by our financing arrangements. See Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—External Sources of Liquidity” of this Form 10-K for further information.

Recent Sales of Unregistered Securities

None.

Issuer Purchases of Equity Securities

On July 31, 2025, our Board of Directors (the “Board”) authorized a program to repurchase up to $400.0 million of shares of our common stock through December 31, 2027 (the “2025 Program”). The 2025 Program replaced the program authorized by the Board in November 2024 for $250.0 million (the “2024 Program”), including the remaining unused amounts under the 2024 Program. The 2025 Program authorizes us to purchase shares of our common stock from time to time via open market purchases at prevailing market prices, in privately negotiated transactions, block trades, or pursuant to trades intending to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, or through other legally permissible means, depending on market conditions and in accordance with applicable rules and regulations. The 2025 Program does not obligate us to acquire any particular amount of our common stock, and we may suspend or discontinue the 2025 Program at any time. The actual timing, manner, number and dollar amount of repurchase transactions will be determined by our management, in its discretion and will depend on a number of factors, including but not limited to, the market price of our common stock.

The 2015 Equity Incentive Plan, adopted by us on June 24, 2015, as amended on April 26, 2016 and as further amended on April 27, 2017, February 20, 2019, April 24, 2019, April 28, 2021, April 28, 2022, April 25, 2024, October 22, 2024 and April 28, 2025 (the “2015 Plan”), provides for the withholding of shares to satisfy minimum statutory tax withholding obligations. It does not specify a maximum number of shares that can be withheld for this purpose. The shares of common stock withheld to satisfy minimum tax withholding obligations may be deemed to be “issuer purchases” of shares that are required to be disclosed pursuant to this Item 5.

The following table presents information with respect to purchases of common stock we made during the three months ended December 31, 2025.

Securities Authorized for Issuance under Equity Compensations Plans

The information required with respect to this item is incorporated herein by reference to our Definitive Proxy Statement for our 2026 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission no later than 120 days after the close of our year ended December 31, 2025.

Item 6. [Reserved]

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of operations should be read together with the consolidated financial statements and the related notes included in Item 8 of this Annual Report on Form 10-K (“Form 10-K”). This discussion contains forward-looking statements related to future events and our future financial performance that are based on current expectations and subject to risks and uncertainties. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of many factors, including those set forth in Part I, Item 1A. “Risk Factors” and “Cautionary Note Regarding Forward Looking Statements.” included in this Form 10-K.

This section discusses 2025 and 2024 items and year-to-year comparisons between 2025 and 2024. Discussions of 2023 items and year-to-year comparisons between 2024 and 2023 have been excluded from this Form 10-K and can be found in “Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our Form 10-K for the fiscal year ended December 31, 2024, filed with the Securities and Exchange Commission (“SEC”) on February 26, 2025.

Overview

Our Business

We are the leading radiopharmaceutical-focused company committed to enabling clinicians to Find, Fight and Follow disease to deliver better patient outcomes. We classify our products into three product categories: Radiopharmaceutical Oncology, Precision Diagnostics, and Strategic Partnerships and Other Revenue. Our Radiopharmaceutical Oncology product helps healthcare professionals (“HCPs”) Find, Fight and Follow cancer. Our Precision Diagnostic products assist HCPs to Find and Follow diseases. Our Strategic Partnerships include biomarkers and digital solutions in support of our partners’ therapeutic development, out-licensing agreements for non-core assets and optimization of our assets geographically, as well as contract development and manufacturing organization (“CDMO”) revenue generated by Evergreen.

Our commercial products are used by cardiologists, internal medicine physicians, neurologists, nuclear medicine physicians, oncologists, radiologists, sonographers, technologists, and urologists working in a variety of clinical settings. We believe that our diagnostic products provide information that enables HCPs to better detect and characterize, or rule out, disease, with the potential to achieve better patient outcomes, reduce patient risk, and limit overall costs.

We produce and market our products throughout the United States (the “United States” or the “U.S.”), selling primarily to hospitals, independent imaging centers and government facilities. We generally sell our products outside the United States through a combination of direct distribution in Canada, third-party distribution relationships in Europe, Canada, Australia, Asia-Pacific, Central America and South America and by licensing exclusive rights to develop and commercialize certain products outside the United States.

We are headquartered in Massachusetts, with offices in New Jersey, Canada, Germany, Switzerland, Sweden and the United Kingdom.

Recent Developments

During 2025, we announced multiple strategic transactions, which shape and sharpen our strategic focus within the radiopharmaceutical industry. A brief description of these transactions is summarized below.

Sale of SPECT Business

On January 1, 2026, we completed the sale of our single-photon emission computerized tomography (“SPECT”) business to SHINE Technologies, LLC (“SHINE”), a wholly-owned subsidiary of Illuminated Holdings, Inc. We are entitled to receive total consideration of up to $155.0 million, consisting of cash, a convertible installment note, a term note and contingent earnout payments. Under the terms of the definitive agreement, SHINE acquired the assets and liabilities associated with our SPECT business, including its approved products (TechneLite, NEUROLITE, Xenon Xe-133 Gas, and Cardiolite), the portion of the North Billerica, Massachusetts campus that manufactured our SPECT products and the SPECT-related Canadian operations. The transaction allows us to focus on growing our commercial portfolio of innovative PET radiodiagnostics and microbubbles, while advancing our pipeline of radiopharmaceuticals.

Leadership Transition Plan

Effective November 7, 2025, Mary Anne Heino, the Chair of our Board of Directors (the “Board”), was appointed to serve as our Executive Chair and principal executive officer. Additionally, on January 1, 2026 (the “Effective Date”), Ms. Heino became our Chief Executive Officer (“CEO”), following the retirement of our former CEO, Brian Markison on December 31, 2025. Ms. Heino will serve as CEO until such time as the Board completes the comprehensive search process that it initiated to

identify and appoint the Company’s next CEO. Mr. Markison has agreed to serve as a strategic advisor to the Company through at least March 31, 2026.

Grant of Prescription Drug User Fee Act (“PDUFA”) Date for LNTH-2501

In October 2025, we announced that the FDA has set a PDUFA target action date of March 29, 2026 for LNTH-2501. LNTH-2501 is a diagnostic kit for the preparation of Gallium-68 (“Ga-68”) edotreotide injection, which has been studied for use with PET imaging for localization of somatostatin receptor-positive neuroendocrine tumors in adult and pediatric patients.

Acceptance of New Drug Application for MK-6240

In October 2025, we announced that the FDA had accepted our New Drug Application (“NDA”) for MK-6240, our registrational F-18 tau-targeted PET imaging agent for the detection of tau neurofibrillary tangle pathology in patients with cognitive impairment being evaluated for Alzheimer’s disease, and has set a PDUFA target action date of August 13, 2026. During the second quarter of 2025, we announced that MK-6240 successfully met its co-primary endpoints in two pivotal studies assessing its sensitivity and specificity. The data from these two studies supported our NDA submission to the FDA. MK-6240 previously received Fast Track designation from the FDA for its potential to address an unmet medical need in Alzheimer’s disease diagnostics.

Exclusive License for Prostate Cancer Imaging Agent Piflufolastat F-18 in Japan

On September 24, 2025, we announced an exclusive licensing agreement for GE HealthCare Limited (“GE Healthcare”) to develop, manufacture, and commercialize Lantheus’ piflufolastat F-18 PET imaging agent (marketed in the United States as PYLARIFY) in Japan for prostate cancer diagnostics and companion diagnostic use. Under the terms of the agreement, GE Healthcare paid us an upfront license fee and will pay us development milestones and tiered royalties based on product sales in Japan.

Acceptance of NDA for PSMA PET Imaging Agent

In August 2025, we announced that the FDA had accepted our NDA for a new formulation of our F-18 PSMA PET imaging agent, filed by our subsidiary Aphelion, and that the FDA has set a PDUFA target action date of March 6, 2026. The new formulation was designed to enhance product stability and increase batch production, with the potential to enhance supply flexibility and improve operating leverage across the network. If the NDA is approved, we plan to work closely with clinicians and PMF sites to ensure a smooth rollout of the new formulation, including providing clear guidance on ordering, handling, and clinical use to support continuity of care for patients, and we plan to apply for reimbursement from the Centers for Medicare & Medicaid Services (“CMS”) for the new formulation, including seeking three years of TPT Status.

Share Repurchase Program

On July 31, 2025, our Board authorized a program to repurchase up to $400.0 million of shares of our common stock through December 31, 2027 (the “2025 Program”). The 2025 Program replaced the program authorized by the Board in November 2024 to repurchase up to $250 million of our common stock during the twelve months following the authorization (the “2024 Program”), including the remaining unused amounts under the 2024 Program. We repurchased 1.3 million shares for approximately $100.0 million under the 2024 Program in 2025. The 2025 Program authorizes us to purchase shares of our common stock from time to time via open market purchases at prevailing market prices, in privately negotiated transactions, block trades, or pursuant to trades intending to comply with Rule 10b5-1 under the Exchange Act or through other legally permissible means, depending on market conditions and in accordance with applicable rules and regulations. The timing, manner, price and amount of any repurchase will be subject to the discretion of our Management. The 2025 Program does not obligate us to acquire any particular amount of its common stock, and we may suspend or discontinue the 2025 Program at any time. We repurchased 3.5 million shares for approximately $200.0 million under the 2025 Program in 2025.

Acquisition of Life Molecular Imaging Limited

On July 21, 2025, we acquired Life Molecular, pursuant to the terms of the Sale and Purchase Agreement with Life Medical Group Limited (“Life Medical”) and Life Healthcare Group Holdings Limited (the “Sale and Purchase Agreement” and, such acquisition, the “LMI Acquisition”). Life Molecular, headquartered in Berlin, Germany, possesses an Alzheimer’s disease radiodiagnostic commercial infrastructure, research and development (“R&D”) capabilities, and an established international footprint. The LMI Acquisition includes Neuraceq, an Alzheimer’s disease radiodiagnostic. Neuraceq is commercially approved in the United States, Canada, the European Union, the United Kingdom, Switzerland, China, Japan, South Korea, and Taiwan.

As consideration for the LMI Acquisition, we remitted an upfront payment of $355.2 million in cash, and could be required to pay up to an additional $400.0 million in potential earn-out and milestone payments. In November 2025 and in accordance with the terms of the Sale and Purchase Agreement, we finalized the net working capital accounts with Life Medical and we received a $2.3 million payment from Life Medical. This $2.3 million payment was recorded as an adjustment to purchase

consideration in the fourth quarter of 2025. Additionally, we assumed a contingent consideration liability owed to Piramal Holdings SA (“Piramal”), pursuant to a Securities Purchase Agreement between Piramal and Life Molecular.

Previously, on July 3, 2024,we acquired from Life Molecular the global rights to RM2, its clinical stage, gastrin-releasing peptide receptor (“GRPR”)-targeting agent, including the associated novel, clinical-stage radiotherapeutic and radiodiagnostic pair, previously referred to as 177Lu-DOTA-RM2 and 68Ga-DOTA-RM2 (and which we now refer to as LNTH-2402 and LNTH-2401, respectively), for an upfront payment of $35.0 million plus a $1.0 million payment made prior to the acquisition (the “RM2 Asset Purchase”), pursuant to the Sublicense, Development and Collaboration Agreement, by and between us and Life Molecular, dated as of June 27, 2024 (the “RM2 Sublicense Agreement”). In addition, and pursuant to the RM2 Sublicense Agreement, we incurred €10.0 million in milestone achievements related to regulatory activities in 2025.

In connection with the LMI Acquisition, the RM2 Sublicense Agreement was amended to (i) reduce the contingent regulatory and development milestones by €45.0 million; (ii) assign the right to future payments from Life Molecular to its former parent, Life Medical; and (iii) eliminate certain other non-substantive rights contained in the RM2 Sublicense Agreement (the “RM2 Amendment”). We determined that the RM2 Amendment did not constitute settlement of a pre-existing relationship in accordance with Accounting Standards Codification 805, “Business Combinations”, and concluded that the amendment represented a modification to the RM2 Sublicense Agreement, whereby we did not reacquire any incremental rights or assets. Accordingly, we will continue to account for the RM2 Sublicense Agreement as an asset acquisition, separate from the LMI Acquisition. We may be required to pay Life Medical additional milestone payments and royalties in connection with the RM2 Asset Purchase. GRPR is a member of the bombesin G protein-coupled receptor family, which has been found to be overexpressed in multiple cancers. First-in-human dosimetry showed a favorable safety and dosimetry profile and confirmed preclinical data demonstrating dose-dependent efficacy of LNTH-2402. We submitted investigational new drug applications in support of a Phase 1b/2 clinical trial with the LNTH-2401/LNTH-2402 theranostic pair in prostate cancer patients in the fourth quarter of 2025.

For more information on the acquisition of the global rights to RM2, see Note 19,“Acquisitions” to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

In February 2026, we renamed Life Molecular to Lantheus Biosciences Ltd.

Acquisition of Evergreen Theragnostics, Inc.

On April 1, 2025, we acquired all the issued and outstanding shares of Evergreen by means of a statutory merger of our subsidiary with and into Evergreen, with Evergreen surviving as our wholly-owned subsidiary (the “Evergreen Merger”), pursuant to the terms of the Agreement and Plan of Merger (the “Evergreen Merger Agreement”) with Evergreen and Shareholder Representative Services LLC. Evergreen is a clinical-stage radiopharmaceutical company engaged in CDMO services as well as drug discovery and commercialization of proprietary products.

As consideration for the Evergreen Merger, we made an upfront payment of $276.4 million in cash. In the event of achievement of specified milestones, we would be required to pay up to an additional $727.5 million in cash, which may be adjusted pursuant to the terms of the Evergreen Merger Agreement.

For more information, see Note 19, “Acquisitions” to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Acquisition of NAV-4694

On June 18, 2024, we acquired Meilleur, including its asset NAV-4694, an investigational late-stage F-18-labeled PET imaging agent that targets beta amyloids in Alzheimer’s disease. Under the terms of the agreement, we paid the stockholders of Meilleur (“Meilleur Stockholders”) an upfront payment of $32.9 million and paid an additional $10.0 million in August 2024 after the successful completion of a technology transfer. We could pay additional milestone payments upon achievement of specified U.S. regulatory milestones related to NAV-4694. We could also pay double-digit milestone payments upon achievement of specified annual commercial sales and double-digit royalty payments for research revenue and commercial sales. Research revenue is derived from partnerships with pharmaceutical companies and academic institutions that use NAV-4694 in clinical trials. NAV-4694 is currently in Phase 3 development and is also being used in academic and industry sponsored clinical trials. In May 2025, we paid AstraZeneca AB (“AstraZeneca”), a $10.0 million one-time, non-refundable upfront payment to reduce the future royalty obligations owed to AstraZeneca pursuant to a license agreement between AstraZeneca and Meilleur related to NAV-4694.

For more information, see Note 19, "Acquisitions" to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Radiopharm Theranostics Limited

On June 15, 2024, we entered into an agreement with Radiopharm Theranostics Limited (“Radiopharm”) to acquire all of Radiopharm’s rights to two licensed preclinical assets for an upfront payment of $2.0 million (the “Radiopharm Asset Purchase”). We acquired global, exclusive rights to both a leucine-rich repeat-containing protein 15-targeted radiotherapeutic, which we refer

to as LNTH-2403, and a Trophoblast cell surface antigen-2 targeted radiodiagnostic, which we refer to as LNTH-2404, each of which is a preclinical therapeutic candidate. LNTH-2403 is our pre-clinical therapeutic targeting LRRC15, which is strongly expressed in multiple malignancies, including head and neck, breast, lung, and pancreatic cancers. In connection with this acquisition, we assumed the underlying license agreements related to the two preclinical assets, together with their respective milestone and royalty payment obligations.

During the third quarter of 2024, we purchased 149,625,180 shares of Radiopharm common stock (“Radiopharm Shares”), for an aggregate purchase price of approximately $5.0 million. During 2025, we purchased an aggregate additional 388,333,333 Radiopharm Shares for an aggregate purchase price of approximately $10.0 million.

For more information, see Note 19, “Acquisitions” and Note 4, "Fair Value of Financial Instruments" to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Strategic Agreements with Perspective Therapeutics, Inc.

On January 8, 2024, we entered into multiple strategic agreements with Perspective Therapeutics, Inc. (“Perspective”), a radiopharmaceutical company that is pursuing advanced treatment applications for cancers throughout the body. Under the agreements, we obtained an option to exclusively license Perspective’s Pb212-VMT-α-NET, a clinical stage alpha therapy in development for the treatment of neuroendocrine tumors, and an option to co-develop certain early-stage therapeutic candidates targeting prostate cancer using Perspective’s innovative platform technology for an aggregate upfront payment of $28.0 million in cash.

On March 1, 2024, we transferred the fixed assets and associated lease of our Somerset, New Jersey facility (the “Somerset Facility”) to Perspective, and the parties entered into a transition services arrangement pursuant to which we provided to Perspective certain services relating to final disposal of radioactive waste and certain other related services.

During 2024, we also purchased an aggregate of 11,677,339 shares of Perspective’s common stock, after giving effect to a 1-for-10 reverse stock split, for $57.4 million.

For more information, see Note 19, "Acquisitions" and Note 4, "Fair Value of Financial Instruments" to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Other Strategic Changes

During 2024, we reviewed our current capabilities and skillsets and “began implementing organizational changes deemed necessary to best position us to execute on our long-term strategy. These changes included transitioning approximately 75 employees out of the Company. For more information, see Note 13, "Stockholders’ Equity and Stock-Based Compensation" to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

Amendment of Credit Facility

In December 2024, we amended our five-year revolving credit facility (as amended, the “2022 Revolving Facility”). The amendment, among other things, extended the maturity date from December 2, 2027 to December 19, 2029, increased the 2022 Revolving Facility from $350.0 million to $750.0 million and increased the additional amount that we may request to add to the increased revolving commitment by $350.0 million. The amendment also, among other things, (i) reduces the ranges of margins based on our Total Net Leverage Ratio (as defined in the 2022 Revolving Facility) used to calculate interest for the revolving loans and (ii) reduces the maximum unused commitment fee from 0.35% per annum to 0.30% per annum.

Key Factors Affecting Our Results

Our business and financial performance have been, and continue to be, impacted by the following:

PYLARIFY and PSMA PET Revenue

PYLARIFY, an F-18-labeled PET imaging agent targeting PSMA, was approved by the FDA in May 2021 and commercially launched in the United States in June 2021. PYLARIFY is indicated for PET imaging of PSMA-positive lesions in patients with prostate cancer with suspected metastasis who are candidates for initial definitive therapy and in patients with suspected recurrence based on elevated prostate-specific antigen levels. PYLARIFY is available through a diverse, multi-partner network of PMFs, including both commercial and academic partners.

The continued substantial revenue contribution from PYLARIFY is dependent on our ability to maintain PYLARIFY as a widely utilized PSMA PET imaging agent in an increasingly competitive space. PYLARIFY’s competition includes three Ga-68-based PSMA imaging agents, an F-18-based PSMA imaging agent, and other non-PSMA-based imaging agents commonly referred to as conventional imaging. The potential for future generic entrants to the market due to the expiry of PYLARIFY’s new chemical entity exclusivity period in 2026 could also generate increased competition for PYLARIFY, as well as ongoing

development of additional F-18 and Ga-68 tracers and new PSMA tracers using additional isotopes, particularly Copper-64. We will continue to make investments necessary to drive PYLARIFY awareness and adoption.

Continued substantial revenue contribution from PYLARIFY will also depend on our ability to clinically differentiate PYLARIFY from competitive products so that customers continue to choose PSMA PET with PYLARIFY for appropriate patients because of its clinical differentiation and despite the loss of TPT Status and the related changes to Medicare fee-for-service (“FFS”) hospital outpatient payment. Our Healthcare Procedure Coding System code, which enables streamlined billing, went into effect as of January 1, 2022. In addition, from January 1, 2022 to December 31, 2024, PYLARIFY had TPT Status from CMS in the hospital outpatient setting, enabling traditional Medicare FFS to provide separate payment for PYLARIFY in addition to the payment for the PET/computed tomography procedure in that setting. In November 2024, CMS released the final rule for its calendar year 2025 Medicare Hospital Outpatient Prospective Payment System (the “CMS 2025 OPPS Rule”), which recognized the value and need for broad access to diagnostic radiopharmaceuticals. The CMS 2025 OPPS Rule provided separate payment for those diagnostic radiopharmaceuticals with per day costs greater than $630 based on their mean unit cost (“MUC”) for patients with traditional Medicare FFS insurance coverage who are treated in the hospital outpatient setting. In November 2025, CMS released the final rule for its calendar year 2026 Medicare Hospital Outpatient Prospective Payment System (the “CMS 2026 OPPS Rule”), which continues to provide for separate payment for diagnostic radiopharmaceuticals with per day costs greater than $655 based on their MUC. As a result, since January 1, 2025, CMS has maintained separate payment for PYLARIFY based on MUC in the hospital outpatient setting, which is lower than payments based on the average selling price that were made during TPT Status. Although PYLARIFY continues to be paid separately, other competitive PSMA PET imaging agents continue to have TPT Status after December 31, 2024, and hospital use of those products, for patients with traditional Medicare FFS in the hospital outpatient setting, generally will be paid separately based on ASP plus six percent rather than on MUC. In November 2025, in the preamble to the CMS 2026 OPPS Rule, CMS acknowledged that there could be value in the use of Average Sales Price (“ASP”) for determining separately paid diagnostic radiopharmaceutical payment amounts in the future. However, CMS will continue to use the arithmetic MUC to calculate payment for diagnostic radiopharmaceuticals in 2026, explaining that there must be more consistent, validated, and universal reporting of ASP data for diagnostic radiopharmaceuticals before ASP can be the basis for payment. CMS reiterated in the CMS 2026 OPPS Rule that, although ASP reporting for diagnostic radiopharmaceuticals remains voluntary at this time, it will continue to evaluate whether and how ASP could be used for future Medicare Outpatient Prospective Payment System (“OPPS”) payment once reporting is sufficiently consistent, validated, and universal. We report ASP and have repeatedly engaged CMS on methodology for reporting ASP, and we will continue to work with coalition partners and CMS to support using ASP rather than MUC to calculate payment for diagnostic radiopharmaceuticals in future years similar to the way OPPS currently pays for other drugs, biologics, and therapeutic radiopharmaceuticals.

Our plan to successfully grow our PSMA PET franchise includes obtaining approval for and commercializing a new formulation of our F-18 PSMA PET imaging agent, conveying our product’s commercial and clinical value, negotiating and realizing the benefits from strategic contracts with customers in the United States, expanding PSMA PET in appropriate new patient populations, and through strategic partnerships and collaborations, including outside of the United States. On August 6, 2025, we announced that the FDA has accepted our NDA for a new formulation of our F-18 PSMA PET imaging agent. Internationally, we previously licensed exclusive rights to Curium Pharma (“Curium”) to develop and commercialize piflufolastat F-18 in Europe, where it is being commercialized in the European Union under the brand name PYLCLARI. In September 2025, we entered into an exclusive licensing agreement for GE Healthcare to develop, manufacture, and commercialize piflufolastat F-18 in Japan for prostate cancer diagnostics and companion diagnostic use. We have also entered into strategic collaborations with pharmaceutical companies for the use of PYLARIFY in connection with the development of PSMA-targeted therapeutics. Additional information on these collaborations are described further under Part I, Item 1. “Business - Strategic Partnerships and Other Revenue – Oncology” of this Form 10-K.

DEFINITY Revenue

We believe we will be able to increase use of DEFINITY through continued education of physicians and HCPs about the benefits of ultrasound enhancing agents in suboptimal echocardiograms. The U.S. market currently has three echocardiography ultrasound enhancing agents approved by the FDA; we estimate that DEFINITY will continue to hold at least an 80% share of the U.S. segment for ultrasound enhancing agents in echocardiography procedures.

As we continue to grow our Microbubble Platform, our activities include:

Neuraceq Revenue

Neuraceq, an F-18 labeled PET imaging agent that binds selectively to beta-amyloid plaques in the brain, was approved by the FDA in 2014. Neuraceq is a radioactive diagnostic drug indicated for PET imaging of the brain to estimate amyloid beta neuritic plaque density in adults with cognitive impairment who are being evaluated for Alzheimer’s disease and other causes of cognitive decline, and selection of patients who are indicated for amyloid beta-directed therapy as described in the prescribing information of the therapeutics products. Additional indications of Neuraceq were approved in 2025 to include selection of patients for amyloid-targeting therapies and quantitative PET analysis.

We believe future growth in Neuraceq revenue will depend on: (i) our ability to engage our existing PYLARIFY customers to introduce Neuraceq to those customers, (ii) expanded geographical access to Neuraceq, which in turn depends on our ability to increase Neuraceq manufacturing capacity at existing manufacturing sites and add additional sites, (iii) increased adoption and utilization of beta-amyloid PET and anti-amyloid therapeutics, (iv) increased utilization based on the updated Neuraceq prescribing information indicating that Neuraceq can be used for patient selection for anti-amyloid therapies where the prescribing information for the therapy so states, (v) our ability to educate customers on the approved uses of Neuraceq, including its ability to quantify the degree of amyloid burden in the brain and (vi) our ability to clinically differentiate Neuraceq from competitive products so that customers choose Neuraceq for appropriate patients because of its clinical attributes and despite the disparity in MUC payment rates for Neuraceq compared to other products used for traditional Medicare patients in the hospital outpatient setting.

Expansion of Strategic Partnerships and Other Revenue

We continue to seek ways to increase the overall value of our portfolio of products and product candidates. We are evaluating a number of different opportunities to collaborate, in-license or acquire additional products, product candidates, businesses and technologies to drive our future growth. In particular, with respect to our Strategic Partnerships and Other Revenue category, we are focused on radiopharmaceutical diagnostic and therapeutic product opportunities in oncology, neurology, and other strategic areas that will complement our existing portfolio.

Our Strategic Partnerships and Other Revenue category includes our Strategic Partnerships, Digital Solutions, Biomarker Solutions and CDMO services and is focused on enabling precision medicine with biomarkers, digital solutions, as well as providing CDMO services.

Inventory Supply & Third Party Suppliers

We obtain a substantial portion of our imaging agents from third-party suppliers. Jubilant HollisterStier (“JHS”) is currently a significant supplier of DEFINITY. Our manufacturing and supply agreement with JHS (the “JHS MSA”) runs through

December 31, 2027 and can be further extended by mutual agreement of the parties. The JHS MSA requires us to purchase from JHS specified percentages of our total requirements for DEFINITY each year during the contract term. Either party can terminate the JHS MSA upon the occurrence of certain events, including the material breach or bankruptcy of the other party.

Radiopharmaceuticals are decaying radioisotopes with half-lives ranging from a few hours to several days. Radiopharmaceutical finished goods, such as doses of PYLARIFY and Neuraceq, cannot be kept in inventory because of their limited shelf lives and are subject to just-in-time manufacturing, processing, and distribution, which takes place at multiple PMF manufacturing partner sites that produce and deliver doses for us across the United States.

Research and Development Expenses

To ensure we remain the leading radiopharmaceutical-focused company, we have historically made and will continue to make substantial investments in new product development and lifecycle management for existing products, including:

For more information on potential milestone and royalty payments related to the product candidates listed above, see Note 19, "Acquisitions" to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data” of this Form 10-K.

PNT2002

Under the terms of the PNT2002 License Agreement, we paid POINT Biopharma Global Inc. (“POINT”) an upfront cash payment of $250.0 million. The Phase 3 registrational clinical trial for PNT2002, known as the “SPLASH” study, reached 100% of prespecified overall survival events. The results of the readout were comparable to the previously reported 46% and 75% readouts and remain confounded by the overwhelming number of patients who crossed over within the study to receive PNT2002. While we continue to review the available PNT2002 data, we do not currently plan to pursue an NDA or further invest in this asset.

PNT2003

Under the terms of the PNT2003 License Agreement, we paid POINT an upfront payment of $10.0 million, and could pay up to an additional $34.5 million in milestone payments upon the achievement of specified U.S. and ex-U.S. regulatory milestones. POINT is also eligible to receive up to $275.0 million in sales milestone payments upon the achievement of specified annual sales thresholds of PNT2003. In addition, POINT is eligible to receive royalty payments of 15% of net sales of PNT2003.

Our investments in these additional clinical activities and lifecycle management opportunities will increase our operating expenses and impact our results of operations and cash flow, and we can give no assurances as to whether any of these clinical development candidates or lifecycle management opportunities will be successful.

Results of Operations

The following is a summary of our consolidated results of operations:

Comparison of the Periods Ended December 31, 2025 and 2024

Revenues

We classify our revenues into three product categories: Radiopharmaceutical Oncology, Precision Diagnostics, and Strategic Partnerships and Other Revenue. Radiopharmaceutical Oncology consists of PYLARIFY and historically included AZEDRA. In the first quarter of 2024, we discontinued the production of AZEDRA. Precision Diagnostics includes DEFINITY, Neuraceq (which we acquired on July 21, 2025 as part of our acquisition of Life Molecular), and other diagnostic imaging products, and historically included TechneLite, which we sold to SHINE on January 1, 2026. Strategic Partnerships and Other Revenue primarily includes revenue derived from partnerships with pharmaceutical companies and academic institutions that use our commercial or investigational products in clinical trials as research tools. This category of revenues also includes royalties and other milestone payments received from our strategic partners that have commercialized products pursuant to license arrangements with us as well as CDMO revenue generated by Evergreen, which we acquired on April 1, 2025.

Revenues are summarized by product category on a net basis as follows:

The increase in revenues for the year ended December 31, 2025, as compared to 2024, was primarily driven by revenues generated from sales of Neuraceq subsequent to our acquisition of Life Molecular in July 2025 and revenue from CDMO services generated subsequent to our acquisition of Evergreen in April 2025, in both cases, for which there were no comparable amounts in the same period of 2024, as well as by an increase in DEFINITY sales volume and a milestone achievement for the first commercial sale of Flyrcado by GE Healthcare and achievement of a clinical trial sales milestone with AstraZeneca. These increases were partially offset by a decrease in net sales price of PYLARIFY and a decrease in sales volume of TechneLite.

Rebates

Estimates for rebates represent our estimated obligations under contractual arrangements with third parties. Rebate accruals are recorded in the same period the related revenue is recognized, resulting in a reduction of revenue and the establishment of a liability which is included in accrued expenses and other current liabilities in our consolidated balance sheets. These rebates result from performance-based offers that are primarily based on attaining contractually specified sales volumes and growth, Medicaid rebate programs for our products, administrative fees of group purchasing organizations and certain distributor-related commissions. The calculation of the accrual for these rebates is based on an estimate of the third-party’s expected purchases and the resulting applicable contractual rebate to be earned over a contractual period.

A rollforward of the amount of, and change in, reserves for rebate liabilities is summarized as follows: