UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 31, 2026

OFFICE PROPERTIES INCOME TRUST

(Exact name of registrant as specified in its charter)

(617) 219-1440

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

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

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company    ¨

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.  ¨

In this Current Report on Form 8-K (this “Current Report”), the terms the “Company,” “we,” “us,” and “our” refers to Office Properties Income Trust.

Item 7.01. Regulation FD Disclosure

As previously reported, on October 30, 2025, the Company and its debtor affiliates (collectively, the “Debtors”) each commenced with the United States Bankruptcy Court for the Southern District of Texas (the “Bankruptcy Court”) a voluntary case (collectively, the “Chapter 11 Cases”) under chapter 11 of title 11 of the United States Code (the “Bankruptcy Code”). The Chapter 11 Cases are jointly administered under the caption In re Office Properties Income Trust, et al., Case No. 25-90530.

The 2027 Ad Hoc Group Mediation and Amended Settlement

Pursuant to the Stipulation and Agreed Order Regarding Mediation and Appointing Judge Marvin Isgur as Mediator (Docket No. 893) (the “2027 Mediation Order”) entered by the Bankruptcy Court, on March 2, 2026, (a) the Debtors, (b) an ad hoc group (the “September 2029 Ad Hoc Group”) of holders of the Company’s 9.000% Senior Secured Notes due September 30, 2029, and (c) an ad hoc group (the “2027 Ad Hoc Group” and together with the Debtors and the September 2029 Ad Hoc Group, each a “Party” and, collectively, the “Parties”) of holders of certain of the Company’s 3.250% Senior Secured Notes due December 11, 2026 (the “2027 Senior Secured Notes”) commenced non-binding mediation to resolve certain disputes and issues in the Chapter 11 Cases. This disclosure contains all of the information that is required to be disclosed pursuant to paragraph 13 of the 2027 Mediation Order. Terms used but not otherwise defined herein have the meanings ascribed to them in the Second Amended Joint Chapter 11 Plan of Reorganization of Office Properties Income Trust and its Debtor Affiliates [Docket No. 1016] filed by the Debtors (as may be amended, modified, or supplemented from time to time, including to reflect the terms of the Amended 2027 Settlement Term Sheet (as defined below), the “Plan”).

The Parties—including advisors and principals—participated in the mediation and worked closely with the Mediator and each other to reach resolution of the issues. On or about March 2, 2026, negotiations concluded and an initial settlement was reached among the Parties (the “Original 2027 Settlement”). The Parties continued to revise and finalize the Original 2027 Settlement and on March 31, 2026, the Parties entered into an amended settlement (the “Amended 2027 Settlement”) and filed a revised version of the settlement term sheet (the “Amended 2027 Settlement Term Sheet”) [Docket No. 1139]. A copy of the Amended 2027 Settlement Term Sheet is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Certain of the key amendments to the Original 2027 Settlement include:

The foregoing description of the Amended 2027 Settlement does not purport to be complete and is qualified in its entirety by reference to the full text of the Amended 2027 Settlement Term Sheet and an amended chapter 11 plan incorporating such settlement.

Monthly Operating Reports

On March 31, 2026, the Debtors filed their Monthly Operating Reports (the “MORs”) with the Bankruptcy Court. The MORs provide financial and operational information regarding the Company’s performance during the period of February 1, 2026 through February 28, 2026. The Debtors continue to operate their businesses and manage their properties as debtors-in-possession under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court.

The Company’s MOR is attached as Exhibit 99.2. Copies of the MORs and other filings with the Bankruptcy Court related to the Chapter 11 Cases are available for review and download, free of charge, on the website of the Debtors’ claims, noticing, and solicitation agent at https://restructuring.ra.kroll.com/OPI or through the Bankruptcy Court’s website, for a fee, at https://ecf.txsb.uscourts.gov. The information contained on, or that may be accessed through, the websites referenced in this Current Report on Form 8-K in each case is not incorporated by reference into, and is not a part of, this Current Report on Form 8-K.

Cautionary Statement Regarding the MORs

The Company cautions investors and potential investors not to place undue reliance upon the information contained in the MORs, which were not prepared for the purpose of providing the basis for an investment decision relating to any of the securities of the Company. The MORs are limited in scope, cover a limited time period, and have been prepared solely for the purpose of complying with the reporting requirements of the Bankruptcy Court. The MORs were not audited or reviewed by independent accountants, were not prepared in accordance with generally accepted accounting principles, are in a format prescribed by applicable bankruptcy rules and guidelines, and are subject to future adjustment and reconciliation. There can be no assurance that, from the perspective of an investor or potential investor in the Company’s securities, the MORs are complete. The MORs also contain information for periods which are shorter or otherwise different from those required in the Company’s reports pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and such information might not be indicative of the Company’s financial condition or operating results for the periods that would be reflected in the Company’s financial statements or in its reports pursuant to the Exchange Act. Results and projections set forth in the MORs should not be viewed as indicative of future results.

Cautionary Language Regarding Trading in the Company’s Common Shares

The Plan provides that the Company’s common shares of beneficial interest, $.01 par value per share (“common shares”), will be cancelled and extinguished on the effective date of the Plan, and the holders thereof will not be entitled to receive, and will not receive or retain, any property or interest in property on account of such common shares. If the Plan is confirmed and the Company’s common shares are cancelled, amounts invested by holders of such common shares will not be recoverable and such common shares will have no value. Trading prices for the Company’s common shares may bear little or no relationship to the actual recovery, if any, by holders of the Company’s common shares upon the conclusion of the Chapter 11 Cases. Accordingly, the Company urges extreme caution with respect to existing and future investments in its common shares.

Cautionary Note Concerning Forward Looking Statements

This Current Report on Form 8-K contains statements that constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and other securities laws. Also, whenever we use words such as “believe,” “expect,” “anticipate,” “intend,” “plan,” “estimate,” “will,” “may,” and negatives or derivatives of these or similar expressions, we are making forward-looking statements. These forward-looking statements are based upon our present intent, beliefs, or expectations, but forward-looking statements are not guaranteed to occur and may not occur. Actual results may differ materially from those contained in or implied by our forward-looking statements as a result of various factors. These forward-looking statements include, among others, statements about the Plan, the process and potential outcomes of the Chapter 11 Cases, and the consummation of the transactions contemplated by the Amended 2027 Settlement Term Sheet. Forward-looking statements are based on the Company’s current expectations, assumptions, and estimates and are subject to risk, uncertainties, and other important factors that are difficult to predict and that could cause actual results to differ materially and adversely from those expressed or implied. These risks include, among others, those related to: the Company’s ability to confirm and consummate the Plan; the duration and outcome of the Chapter 11 Cases; the Company suffering from a long and protracted restructuring; the impact of the Chapter 11 Cases on the Company’s operations, reputation, and relationships with tenants, lenders, and vendors; the Company having insufficient liquidity; the availability of financing; the ability to satisfy the conditions precedent to the restructuring support agreement entered into in connection with the Chapter 11 Cases; the effectiveness of the overall restructuring activities pursuant to the Chapter 11 Cases and any additional strategies that the Company may employ to address its liquidity and capital resources and achieve its stated goals; the potential cancellation of the Company’s equity; and the Company’s historical financial information not being indicative of its future performance as a result of the Chapter 11 Cases.

The information contained in the Company’s filings with the Securities and Exchange Commission (the “SEC”), including under the caption “Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 and subsequent filings with the SEC, or incorporated herein or therein, identifies other important factors that could cause differences from our forward-looking statements. The Company’s filings with the SEC are available on the SEC’s website at www.sec.gov.

You should not place undue reliance upon the Company’s forward-looking statements.

Except as required by law, we do not intend to update or change any forward-looking statements as a result of new information, future events or otherwise.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: April 1, 2026