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Related Party Transactions
 9 Months Ended
Sep. 30, 2025
Related Party Transactions [Abstract]  
Related Party Transactions

Note P – Related Party Transactions

In September 2021, we entered into an Intellectual Property Assignment and License Agreement with MiNK (the “Assignment and License Agreement”). Pursuant to the Assignment and License Agreement, we assigned to MiNK certain patent rights and know-how related to its iNKT cell platform, product candidates and other patents and know-how related to its business. In addition to the patent rights assigned to MiNK by us, MiNK also received an exclusive, royalty-free, sublicensable license to research, develop, manufacture and commercialize certain licensed technology in the field. The Assignment and License Agreement further provides for MiNK to grant us a field-limited, non-exclusive, royalty-free license under the assigned patent rights, subject to MiNK’s discretion and provided such access would not reasonably result in a disruption of planned MiNK activities. We have also agreed to provide MiNK with our biological material upon written request in order for MiNK to use such material in its development activities of a combination therapy. We may withhold the transfer of biological material, including, but not limited to, checkpoint modulating antibodies, for various reasons, including if such transfer would reasonably result in a disruption of our planned activities. For any materials we do share with MiNK, the parties have agreed to enter into a separate agreement governing the transfer and providing for joint ownership of the data. We have agreed that during the full term of the Assignment and License Agreement, and for three years thereafter, we will not develop, manufacture or commercialize an iNKT cell therapy, directly or indirectly by transferring such technology. MiNK may terminate the Assignment and License Agreement without cause upon 90 days’ prior written notice to us. Either party may terminate if there has been a material breach which has not been cured within 90 days (or 45 days for breach of payment obligations) of receiving such notice.

Effective April 1, 2022, we entered into an Amended and Restated Intercompany Services Agreement (the “New Intercompany Agreement”) with MiNK, which amended and restated the Intercompany General & Administrative Agreement between us and MiNK dated September 10, 2021 (the “Prior Intercompany Agreement”). Under the New Intercompany Agreement, we provide MiNK with certain general and administrative support, including, without limitation, financial, facilities management, human resources and information technology administrative support (the “Agenus Services”), and we and MiNK provide each other with certain research and development services (the “R&D Services”) and other support services, including legal and regulatory support (the “Shared Services”). MiNK is required to pay 10% of our costs related to the Agenus Services, and the costs of R&D Services are based upon pass-through costs related to such services plus an allocation of the costs of the employees performing the services. No payment will be due from either party for the Shared Services, provided that the services provided by each party are proportional in scope and volume. MiNK is also entitled to use our business offices and laboratory space and equipment in exchange for MiNK contributing a proportionate payment for the use of such facilities and equipment, and MiNK will be covered by certain of our insurance policies,

subject to certain conditions, including MiNK paying the cost of such coverage. Either party may terminate the New Intercompany Agreement upon 60 days’ prior written notice and individual services upon 30 days’ prior written notice.

Allocated Agenus services primarily include payroll related expenses, facility costs, insurance and stock-based compensation, and are included in the accompanying financial statements based on certain estimates and allocations described above.

Allocation of Agenus services, net of approximately $220,000 for the three months ended September 30, 2025 are included as a contra-expense in “Operating expenses” in our Condensed Consolidated Statement of Operations and “Due from related parties,” of $15.0 million as of September 30, 2025, in our Condensed Consolidated Balance Sheets. We have agreed to not require repayment of this balance for the foreseeable future.

On February 12, 2024, we entered into a Convertible Promissory Note Purchase Agreement (the "Purchase Agreement") with MiNK pursuant to which MiNK issued us a convertible promissory note in the principal amount of up to $5.0 million (the "Note"). The Purchase Agreement sets forth the terms and conditions, including representations and warranties, for MiNK's issuance and sale of the Note to us.

The Note carries an annual rate of interest rate of 2% (the “Interest Rate”) that accrues from the date funds are paid or advanced by us to MiNK. Interest shall accrue and not be payable until converted or paid in connection with the repayment in full of the principal amount of the Note. The Note provides that MiNK will pay us, on request, the principal amount outstanding, together with any unpaid interest, on or after January 1, 2026. In the event of a qualified financing event, as defined in the Note, the outstanding principal amount of the Note plus accrued and unpaid interest shall, at our election, either be paid in full or converted into equity shares equal to the quotient obtained by dividing (i) the amount due on the date of conversion by (ii) 80% of the per share price of the equity securities sold in the qualified financing. Upon a change of control, MiNK will pay Agenus an amount equal to (i) 1.5 times the principal then outstanding under the Note and (ii) the amount of accrued interest then outstanding immediately prior to the closing of such change of control.

As of September 30, 2025, the Note had a principal balance of $5.0 million, an accrued and unpaid interest balance of approximately $154,000 and a market interest rate of 15.0%.

In June 2024, Dr. Jennifer Buell, CEO of MiNK, was appointed to our Board of Directors. Dr. Buell's spouse is a partner in the law firm of Wolf, Greenfield & Sachs, P.C. (“Wolf Greenfield”), which provides us legal services. For the three and nine months ended September 30, 2025, we expensed Wolf Greenfield fees totaling approximately $4,000 and $167,000, respectively, and for the three and nine months ended September 30, 2024, we expensed Wolf Greenfield fees totaling approximately $48,000 and $147,000, respectively. Dr. Buell’s spouse does not receive direct compensation from the fees we pay Wolf Greenfield and the fees we paid to Wolf Greenfield in the period were an insignificant amount of Wolf Greenfield’s revenues. Our Audit and Finance Committee approved these services under its related-party transactions policy.