LIQUIDITY AND CAPITAL RESOURCES
On June 30, 2025, we had cash, cash equivalents and restricted cash of approximately $285.4 million. Cash used in operations of $118.0 million for the six months ended June 30, 2025 principally reflected general and administrative expenses related to our corporate operations, research and development activities and sales and marketing activities related to our pharmaceutical and diagnostic business. Cash from investing activities was $37.7 million for the six months ended June 30, 2025 primarily reflected proceeds from the sale of equity securities, offset by an $7.7 million investment in Entera and capital expenditures of $6.5 million. Cash used in financing activities for the six months ended June 30, 2025 of $83.5 million primarily reflected net borrowings on our lines of credit. We have historically not generated sustained positive cash flow sufficient to offset our operating and other expenses, and our primary sources of cash have been from the public and private placement of equity and debt, as well as credit facilities available to us.
On April 4, 2025, the Company announced that its Board of Directors has authorized an increase of $100.0 million to the Company’s existing Common Stock repurchase program, bringing the aggregate capacity of the program to $200.0 million. Approximately $58.5 million shares of Common Stock has been repurchased under the existing program since its authorization in July 2024. Under this program, the Company may repurchase shares from time to time through various methods, including open market purchases, block trades, privately negotiated transactions, accelerated share repurchases, as well as pursuant to pre-set trading plans meeting the requirements of Rule 10b5-1(c) of the Exchange Act, and otherwise in compliance with applicable laws. The timing and amount of any repurchases is subject to general market conditions, the Company's capital management, investment opportunities, and other factors. The repurchase program does not obligate the Company to repurchase any specific number of shares, has no time limit, and may be modified, suspended, or discontinued at any time at the Company's discretion.
On April 1, 2025, the Company consummated the Note Exchange Transactions related to its 2029 Convertible 144A Notes. Agreements were entered into with certain institutional holders on March 27 and March 28, 2025, and the exchange transactions closed on April 1, 2025. In total, the Company exchanged $159,221,000 aggregate principal amount of the 2029 Convertible 144A Notes for 121,437,998 shares of Common Stock and cash payments totaling approximately $63.5 million, inclusive of accrued and unpaid interest. The exchanged 2029 Convertible 144A Notes were subsequently retired.
On March 10, 2025, the Company and BioReference entered into an agreement with Labcorp, pursuant to which Labcorp has agreed to acquire BioReference's oncology and related clinical testing services assets. The transaction is expected to close in the second half of 2025, with Labcorp paying up to $225 million in cash consideration, including $192.5 million in cash at closing and up to $32.5 million in cash in performance-based contingent consideration.
During the first quarter of 2025, the Company sold its entire holding of 620 thousand shares of GeneDx common stock at various prices per share for approximately $51.7 million in aggregate proceeds. As a result of these sales, the Company no longer holds any shares in GeneDx.
On January 7, 2025, ModeX announced the dosing of the first participant in a Phase 1 study of an EBV vaccine candidate being developed in collaboration with Merck. This achievement triggered a $12.5 million cash milestone payment from Merck to ModeX under the Merck Agreement. Related revenue of $12.5 million was recognized in the fourth quarter of 2024 upon satisfaction of the underlying performance obligation. Pursuant to the Merck Agreement, Merck obtained a license to certain patent rights and know-how in connection with the development of ModeX’s preclinical nanoparticle vaccine candidate targeting the Epstein-Barr Virus. 1 Under the terms of the Merck Agreement, ModeX is eligible to receive up to an additional $860.0 million upon the achievement of certain commercial and development milestones.
ModeX and Merck have established a strategic collaboration with a detailed research plan to guide the development of such a vaccine or related product. This plan includes the creation of a joint steering committee, and the potential use of third-party contract development and manufacturing organization to carry out such activities unless otherwise agreed. Merck will reimburse ModeX for development costs incurred as part of this research plan. To date, we have incurred $26.5 million of development costs related to the Epstein-Barr Virus, which Merck has reimbursed in full.
In September 2024, ModeX entered into the BARDA Amendment which increased funding by $26.9 million, for the ongoing development, manufacturing, and execution of a Phase 1 clinical trial for a next-generation MSTAR multispecific antibody with broad neutralizing activity against known variants of SARS-CoV-2. The BARDA Amendment also included BARDA's exercise of an option for the development of a multispecific protein antibody for influenza or another pathogen, with the additional funding allocated to cover the expanded work. These modifications increased the total value of the BARDA Contract to $110.0 million, with a potential value, of $205.0 million if BARDA exercises all options thereunder to expand ModeX's services. The BARDA Contract covers a five-year period through February 2028. We expect this funding will support the development of a second novel multispecific antibody to SARS-CoV-2, from preclinical through Phase 1 trials, as well as preclinical work on gene-based expression of multispecific antibodies to SARS-CoV-2, including mRNA and/or DNA vectors. In addition, ModeX will begin development of influenza multispecifics with gene and/or protein delivery modalities. As of June