AGENUS INC

(1) Description of Business

Agenus Inc. (including its subsidiaries, collectively referred to as “Agenus,” the “Company,” “we,” “us,” and “our”) is a clinical-stage biotechnology company focused on discovering and developing immunotherapies for cancer and infectious disease. Our primary business is immuno-oncology ("I-O"), where we are advancing antibody-based programs to activate innate and adaptive immunity, overcome tumor immune evasion and expand the population of patients who may benefit from immunotherapy. Our lead clinical program is botensilimab (“BOT” or “AGEN1181”), alone and in combination with balstilimab (“BAL”). We also maintain select clinical-stage immuno-oncology assets, which may be used as standalone agents or be complimentary to botensilimab plus balstilimab (“BOT/BAL”). Agenus also maintains an equity investment in MiNK Therapeutics, Inc. ("MiNK") and a majority ownership of a vaccine adjuvant business through our subsidiary SaponiQx, Inc. ("SaponiQx").

We use internal discovery, translational, clinical and regulatory capabilities together with selected collaborations to advance product candidates. Following our strategic realignment announced in December 2024, we prioritized the botensilimab/balstilimab program and temporarily paused certain non-core preclinical and clinical activities while we evaluate partnering, as well as targeted funding opportunities.

Our I-O portfolio is driven by several platforms and programs, which we plan to utilize individually and in combination:

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Multiple antibody discovery platforms, including proprietary display technologies, to identify future antibody candidates.

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Antibody candidate programs, including our lead assets, botensilimab ("BOT") (a multifunctional immune cell activator and human Fc-enhanced CTLA-4 blocking antibody, also known as AGEN1181) and balstilimab ("BAL") (a PD-1 blocking antibody).

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Our saponin-based vaccine adjuvant platform, primarily centered around our STIMULON™ cultured plant cell (“cpc”) QS-21 adjuvant (“STIMULON cpcQS-21”).

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A pipeline of novel allogeneic invariant natural killer T cell (“iNKT”) therapies for treating cancer and other immune-mediated diseases, controlled by MiNK.

Our business activities include product research, preclinical and clinical development, intellectual property prosecution, manufacturing, regulatory and clinical affairs, corporate finance and development activities, and support of our collaborations. Our product candidates require successful clinical trials and approvals from regulatory agencies, as well as acceptance in the marketplace. Part of our strategy is to develop and commercialize some of our product candidates through arrangements with academic and corporate collaborators and licensees.

Subsequent to December 31, 2025, including cash received in January 2026, we materially strengthened our liquidity position. MiNK Therapeutics repaid a $5.2 million related-party note receivable, and we closed agreements with Zydus Lifesciences Ltd. and its affiliates, pursuant to which we received $91.0 million of consideration, subject to certain adjustments. These adjustments include reimbursable expenses, other required closing payments, including approximately $5.8 million of transaction expenses, and $7.5 million placed into a twelve-month escrow. See Note 23 for further discussion of the proceeds received and liabilities settled in connection with the Zydus closing. As of December 31, 2025, before giving effect to these post-year-end proceeds, we had cash and cash equivalents of $3.0 million, compared with $40.4 million as of December 31, 2024. Since our inception in 1994, we have incurred significant operating losses, and as of December 31, 2025, we had an accumulated deficit of$2.18 billion.

Based on our current operating plan and projections, including payment of debt due in the look-forward period, the majority of which is secured by certain real estate properties, and assuming completion of additional capital transactions of which we are in current discussions, we believe that our existing cash resources, together with the post-year-end proceeds described above and anticipated revenues from our reimbursed compassionate access program in France, would be sufficient to support our critical liquidity requirements into 2027. To advance our planned registration and commercialization strategy for botensilimab/balstilimab, and fund the Company through achievement of profitability, we will require additional capital infusions.

We have historically financed our operations through corporate partnerships, advance royalty transactions, and debt and equity financings. We are actively evaluating and pursuing additional financing and strategic alternatives, including corporate transactions, out-licensing arrangements, asset sales, project financing, additional debt or equity financings, and other strategic transactions, and we are in discussions with potential strategic and financial partners regarding several of these alternatives.

Because the completion and timing of potential financing and strategic transactions are not entirely within our control, and in accordance with accounting standards, substantial doubt exists about our ability to continue as a going concern for at least one year after the date of filing of this Annual Report on Form 10-K. The consolidated financial statements have been prepared assuming we will continue as a going concern and which contemplates the realization of assets and satisfaction of liabilities and commitments in the ordinary course of business. Management has also implemented cost management measures to preserve liquidity.

Research and development program costs include compensation and other direct costs plus an allocation of indirect costs, based on certain assumptions, and our review of the status of each program. Our product candidates are in various stages of development and significant additional expenditures will be required if we start new trials, encounter delays in our programs, apply for regulatory approvals, continue development of our technologies, expand our operations, and/or bring our product candidates to market. The eventual total cost of each clinical trial is dependent on a number of factors such as trial design, length of the trial, number of clinical sites, and number of patients. The process of obtaining and maintaining regulatory approvals for new therapeutic products is lengthy, expensive, and uncertain. Because many of our antibody programs are early stage, and because any further development is dependent on clinical trial results, among other factors, we are unable to reliably estimate the cost of completing our research and development programs or the timing for bringing such programs to various markets or substantial partnering or out-licensing arrangements, and, therefore, when, if ever, material cash inflows are likely to commence. We will continue to adjust our spending as needed in order to preserve liquidity.

(2) Summary of Significant Accounting Policies

(a) Basis of Presentation and Principles of Consolidation

The consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles and include the accounts of Agenus and our subsidiaries. All significant intercompany transactions and accounts have been eliminated in consolidation. Non-controlling interest in the consolidated financial statements represents the portion oftwo of our subsidiaries not 100% owned by Agenus. Refer to Note 10 for additional detail.

On April 4, 2024, we executed a reverse stock split of our issued and outstanding common stock, par value $0.01, at a ratio of 1-for-20 with a record date of April 12, 2024 (the “Reverse Stock Split”). All common share, per share and related information included in the accompanying financial statements and footnote disclosures have been adjusted retroactively, where applicable, to reflect the Reverse Stock Split. Refer to Note 9 for additional detail.

In the years ended December 31, 2025, 2024 and 2023, we deconsolidated certain foreign subsidiaries and recognized a loss of approximately $3.5 million and gains of approximately $185,000 and $132,000, respectively, included in "Other income (expense)" on our consolidated statements of operations and comprehensive income (loss).

In July 2025, our ownership percentage of MiNK dropped below 50%. While we maintain significant influence, this resulted in a loss of control, and as such, MiNK was deconsolidated in the quarter ended September 30, 2025. Upon deconsolidation, we recognized a gain of approximately $100.9 million in our consolidated statements of operations and comprehensive income (loss). Subsequent to the deconsolidation, we accounted for our equity ownership interest in MiNK under the equity method of accounting (fair value option). Refer to Note 4 for more information.

(b) Segment Information

We are managed and currently operate astwo segments. However, we have concluded that our operating segments meet the criteria required by Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 280, Segment Reporting to be aggregated intoone reportable segment. Our operating segments have similar economic characteristics and are similar with respect to the five qualitative characteristics specified in ASC 280. Accordingly, we do not have separately reportable segments as defined by ASC 280. Refer to Note 22 for additional detail.

(c) Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. We base those estimates on historical experience and on various assumptions that are believed to be reasonable under the circumstances. Actual results could differ from those estimates.

(d) Cash and Cash Equivalents

We consider all highly liquid investments purchased with maturities at acquisition of three months or less to be cash equivalents. Cash equivalents consist primarily of money market funds.

(e) Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk are primarily cash equivalents, investments, and accounts receivable. We invest our cash, cash equivalents and short-term investments in accordance with our investment policy, which specifies high credit quality standards and limits the amount of credit exposure from any single issue, issuer, or type of investment. We carry balances in excess of federally insured levels; however, we have not experienced any losses to date from this practice.

(f) Accounts Receivable

Accounts receivable are amounts due from our collaboration partners and customers as a result of research and development and other services provided, as well as the shipment of clinical and pre-commercial product. We considered the need for an allowance for doubtful accounts and have concluded that no allowance was needed as of December 31, 2025 and 2024, as the estimated risk of loss on our accounts receivable was determined to be minimal.

(g) Current Expected Credit Losses

Financial assets measured at amortized cost are assessed for future expected credit losses under the guidance in ASC 326, Financial Instruments – Credit Losses, to determine if application of an expected credit losses reserve is necessary. We perform regular reviews of our receivable balances, including related party receivables, and when appropriate, would record an expected credit losses reserve. We havenot recorded provisions for credit losses for any of the periods presented.

(h) Equity Method Investment

Our equity method investment consists of an investment in common stock of a publicly-held company in which we have the ability to exercise significant influence but do not have control. We have elected the fair value option for our equity method investment.

(i) Fair Value Option

Under the Fair Value Option subsection of Accounting Standards Codification ("ASC") Subtopic 825-10, Financial Instruments – Overall, we have the irrevocable option to report most financial assets and liabilities at fair value on an instrument-by-instrument basis with changes in fair value reported in earnings. We have elected to report our investment in MiNK, including the related party note receivable from MiNK at fair value. The fair value of the equity investment is based on readily determinable pricing available on a securities exchange and the fair value of the related party note receivable is determined on a scenario based present value methodology.

(j) Assets and Liabilities Held for Sale

We classify assets and related liabilities as held for sale when: (i) management has committed to a plan to sell the assets, (ii) the net assets are available for immediate sale, (iii) there is an active program to locate a buyer, (iv) the sale and transfer of the net assets is probable within one year, (v) the sale price of the net assets is comparable to current fair value and (vi) actions required to complete the plan indicate it is unlikely that significant changes will be made or that management will withdraw from the sale. Assets and liabilities held for sale are presented separately on our Condensed Consolidated Balance Sheets at the lower of cost or fair value, less costs to sell. Depreciation of property, plant and equipment and amortization of right-of-use assets are not recorded while these assets are classified as held for sale.

(k) Property, Plant and Equipment

Property, plant and equipment, including software developed for internal use, are carried at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Amortization of leasehold improvements is computed over the shorter of the lease term or estimated useful life of the asset. Additions and improvements are capitalized, while repairs and maintenance are charged to expense as incurred. Amortization and depreciation of plant and equipment was $9.7 million, $12.8 million, and $11.9 million, for the years ended December 31, 2025, 2024, and 2023, respectively.

Construction in progress represents direct and indirect construction costs for leasehold improvements and costs of acquisition and installation of equipment. Amounts classified as construction in progress are transferred to their respective property and equipment account when the activities necessary to prepare the assets for their intended use are completed and the assets are placed in service. Depreciation is not recorded for assets classified as construction in progress.

(l) Fair Value of Financial Instruments

The estimated fair values of all our financial instruments approximate their carrying amounts in the consolidated balance sheets. The fair value of our outstanding debt is based on a present value methodology. The outstanding principal amount of our debt, including the current portion, was $45.5 million and $35.2 million at December 31, 2025 and 2024, respectively.

(m) Revenue Recognition

We account for revenue in accordance with ASC 606, Revenue from Contracts with Customers (“ASC 606”).

For the years ended December 31, 2025, 2024 and 2023,95%,98% and 73%, respectively, of our revenue was earned from one collaboration partner.

In accordance with ASC 606, revenue is recognized when a customer obtains control of promised goods or services. The amount of revenue recognized reflects the consideration to which we expect to be entitled to receive in exchange for these goods and services. To achieve this core principle, we apply the following five steps:

1. Identify the contract with the customer

A contract with a customer exists when (i) the Company enters into an enforceable contract with a customer that defines each party’s rights regarding the goods or services to be transferred and identifies the related payment terms, (ii) the contract has commercial substance, and (iii) the Company determines that collection of substantially all consideration for goods and services that are transferred is probable based on the customer’s intent and ability to pay the promised consideration. The Company applies judgment in determining the customer’s intent and ability to pay, which is based on a variety of factors including the customer’s historical payment experience, or in the case of a new customer, published credit and financial information pertaining to the customer.

2. Identify the performance obligations in the contract

Performance obligations promised in a contract are identified based on the goods and services that will be transferred to the customer that are both capable of being distinct, whereby the customer can benefit from the good or service either on its own or together with other available resources, and are distinct in the context of the contract, whereby the transfer of the good or service is separately identifiable from other promises in the contract. To the extent a contract includes multiple promised goods and services, the Company must apply judgment to determine whether promised goods and services are capable of being distinct and are distinct in the context of the contract. If these criteria are not met, the promised goods and services are accounted for as a combined performance obligation.

3. Determine the transaction price

The transaction price is determined based on the consideration to which the Company will be entitled in exchange for transferring goods and services to the customer. To the extent the transaction price includes variable consideration, the Company estimates the amount of variable consideration that should be included in the transaction price utilizing either the expected value method or the most likely amount method depending on the nature of the variable consideration. Variable consideration is included in the transaction price if, in the Company’s judgment, it is probable that a significant future reversal of cumulative revenue under the contract will not occur. Any estimates, including the effect of the constraint on variable consideration, are evaluated at each reporting period for any changes. Determining the transaction price requires significant judgment, which is discussed in further detail for each of the Company’s contracts with customers in Note 13.

4. Allocate the transaction price to performance obligations in the contract

If the contract contains a single performance obligation, the entire transaction price is allocated to the single performance obligation. Contracts that contain multiple performance obligations require an allocation of the transaction price to each performance obligation on a relative stand-alone selling price basis unless the transaction price is variable and meets the criteria to be allocated entirely to a performance obligation or to a distinct service that forms part of a single performance obligation. The consideration to be received is allocated among the separate performance obligations based on relative stand-alone selling prices. Determining the amount of the transaction price to allocate to each separate performance obligation requires significant judgment, which is discussed in further detail for each of the Company’s contracts with customers in Note 13.

5. Recognize revenue when or as the Company satisfies a performance obligation

The Company satisfies performance obligations either over time or at a point in time. Revenue is recognized over time if either 1) the customer simultaneously receives and consumes the benefits provided by the entity’s performance, 2) the entity’s performance creates or enhances an asset that the customer controls as the asset is created or enhanced, or 3) the entity’s performance does not create an asset with an alternative use to the entity and the entity has an enforceable right to payment for performance completed to date. If the entity does not satisfy a performance obligation over time, the related performance obligation is satisfied at a point in time by transferring the control of a promised good or service to a customer. Examples of control are using the asset to produce goods or services, enhance the value of other assets, settle liabilities, and holding or selling the asset. ASC 606 requires the Company to select a single revenue recognition method for the performance obligation that faithfully depicts the Company’s performance in transferring control of the goods and services. The guidance allows entities to choose between two methods to measure progress toward complete satisfaction of a performance obligation:

Output methods - recognize revenue on the basis of direct measurements of the value to the customer of the goods or services transferred to date relative to the remaining goods or services promised under the contract (e.g. surveys of performance completed to date, appraisals of results achieved, milestones reached, time elapsed, and units of produced or units delivered); and

Input methods - recognize revenue on the basis of the entity’s efforts or inputs to the satisfaction of a performance obligation (e.g., resources consumed, labor hours expended, costs incurred, or time elapsed) relative to the total expected inputs to the satisfaction of that performance obligation.

Licenses of intellectual property: If the license to the Company’s intellectual property is determined to be distinct from the other performance obligations identified in the arrangement, the Company recognizes revenue from non-refundable, up-front fees allocated to the license when the license is transferred to the customer and the customer is able to use and benefit from the license. For licenses that are bundled with other promises, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, up-front fees. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

Milestone payments: At the inception of each arrangement that includes development, regulatory or commercial milestone payments, the Company evaluates whether the milestones are considered probable of being reached and estimates the amount to be included in the transaction price. ASC 606 suggests two alternatives to use when estimating the amount of variable consideration: the expected value method and the most likely amount method. Under the expected value method, an entity considers the sum of probability-weighted amounts in a range of possible consideration amounts. Under the most likely amount method, an entity considers the single most likely amount in a range of possible consideration amounts. Whichever method is used, it should be consistently applied throughout the life of the contract; however, it is not necessary for the Company to use the same approach for all contracts. The Company uses the most likely amount method for development and regulatory milestone payments. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. The transaction price is then allocated to each performance obligation on a relative stand-alone selling price basis. The Company recognizes revenue as or when the performance obligations under the contract are satisfied. At the end of each subsequent reporting period, the Company re-evaluates the probability or achievement of each such milestone and any related constraint, and if necessary, adjusts its estimates of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, which would affect revenues and earnings in the period of adjustment.

Royalties: For arrangements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, the Company recognizes revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied).

Up-front Fees: Depending on the nature of the agreement, up-front payments and fees may be recorded as deferred revenue upon receipt or when due and may require deferral of revenue recognition to a future period until the Company performs its obligations under these arrangements. Amounts payable to the Company are recorded as accounts receivable when the Company’s right to consideration is unconditional. The Company does not assess whether a contract has a significant financing component if the expectation at contract inception is such that the period between payment by the customer and the transfer of the promised goods or services to the customer will be one year or less.

Pre-commercial Product: The Company recognizes revenue when the customer (hospital/physician) obtains control of the product at delivery. Revenue is calculated as the gross amount invoiced to the customer net of reserves for estimated variable consideration, consisting of government rebates and taxes.

(n) Foreign Currency Transactions

Gains and losses from our foreign currency-based accounts and transactions, such as those resulting from the translation and settlement of receivables and payables denominated in foreign currencies, are included in the consolidated statements of operations within other income (expense). We recorded a foreign currency losses of$0.2 million, $29,000, and $0.1 million for the years ended December 31, 2025, 2024 and 2023, respectively.

(o) Research and Development

Research and development expenses include the costs associated with our internal research and development activities, including salaries and benefits, share-based compensation, occupancy costs, clinical manufacturing costs, related administrative costs, and research and development conducted for us by outside advisors, such as sponsored university-based research partners and clinical study partners. We account for our internally managed clinical study costs by estimating the total cost to treat a patient in each clinical trial and recognizing this cost based on estimates of when the patient receives treatment, beginning when the patient enrolls in the trial. Research and development expenses also include the cost of clinical trial materials shipped to our research partners. Research and development costs are expensed as incurred.

(p) Share-Based Compensation

We account for share-based compensation in accordance with the provisions of ASC 718, Compensation—Stock Compensation. Share-based compensation expense is recognized based on the estimated grant date fair value. Compensation cost for awards with time-based vesting is recognized on a straight-line basis over the requisite service period of the award. Forfeitures are recognized as they occur. See Note 11 for a further discussion on share-based compensation.

(q) Income Taxes

Income taxes are accounted for under the asset and liability method with deferred tax assets and liabilities recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and net operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which such items are expected to be reversed or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the consolidated statement of operations in the period that includes the enactment date. Deferred tax assets which are not more likely than not to be realized are subject to valuation allowance.

(r) Net Loss Per Share

Basic income and loss per common share are calculated by dividing the net loss attributable to common stockholders by the weighted average number of common shares outstanding (including common shares issuable under our Directors’ Deferred Compensation Plan). Diluted income per common share is calculated by dividing net income attributable to common stockholders by the weighted average number of common shares outstanding (including common shares issuable under our Directors’ Deferred Compensation Plan) plus the dilutive effect of outstanding instruments such as warrants, stock options, non-vested shares, convertible preferred stock, and convertible notes. Because we reported a net loss attributable to common stockholders for all periods presented, diluted loss per common share is the same as basic loss per common share, as the effect of utilizing the fully diluted share count would have reduced the net loss per common share. Therefore, the following potentially dilutive securities have been excluded from the computation of diluted weighted average shares outstanding as of December 31, 2025, 2024, and 2023, as they would be anti-dilutive (in thousands):

(s) Goodwill

Goodwill represents the excess of cost over the fair value of net assets of businesses acquired. Goodwill is not amortized, but instead tested for impairment at least annually. Annually we assess whether there is an indication that goodwill is impaired, or more frequently if events and circumstances indicate that the asset might be impaired during the year. We perform our annual impairment test as of October 31 of each year. The first step of our impairment analysis compares the fair value of our reporting units to their net book value to determine if there is an impairment. We operate as two reporting units. As of December 31, 2025, our entire goodwill balance is allocated to a reporting unit with a negative carrying amount. No goodwill impairment was recognized in the years ended December 31, 2025 and 2023. In the year ended December 31, 2024, we recognized a goodwill impairment charge of approximately $0.6 million related to the full impairment of the goodwill assigned to one reporting unit.

(t) Long-lived Assets

If required based on certain events and circumstances, recoverability of assets to be held and used, other than goodwill and intangible assets not being amortized, is measured by a comparison of the carrying amount of an asset to the undiscounted future net cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset exceeds its estimated future undiscounted cash flows, an impairment charge is recognized for the amount by which the carrying amount of the asset exceeds the fair value of the asset. Authoritative guidance requires companies to separately report discontinued operations and extends that reporting to a component of an entity that either has been disposed of (by sale, abandonment, or in a distribution to owners) or is classified as held for sale. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell.

(u) Leases

We account for leases in accordance with ASC 842, Leases ("ASC 842").

At the inception of an agreement, we determine whether the contract contains a lease. If a lease is identified in such arrangement, we recognize a right-of-use asset and liability on our consolidated balance sheet and determine whether the lease should be classified as a finance or operating lease. We have elected not to recognize assets or liabilities for leases with lease terms of 12 months or less.

A lease qualifies as a finance lease if any of the following criteria are met at the inception of the lease: (i) there is a transfer of ownership of the leased asset by the end of the lease term, (ii) we hold an option to purchase the leased asset that we are reasonably certain to exercise, (iii) the lease term is for a major part of the remaining economic life of the leased asset, (iv) the present value of the sum of lease payments equals or exceeds substantially all of the fair value of the leased asset, or (v) the nature of the leased asset is specialized to the point that it is expected to provide the lessor no alternative use at the end of the lease term. All other leases are recorded as operating leases.

Our leases commence when the lessor makes the asset available for our use. Finance and operating lease right-of-use assets and liabilities are recognized at the lease commencement date. Lease liabilities are recognized as the present value of the lease payments over the lease term, net of any future lease incentives to be received, using the discount rate implicit in the lease. If the implicit rate is not readily determinable, as is the case with all our current leases, we utilize our incremental borrowing rate at the lease commencement date. Right-of-use assets are recognized based on the amount of the lease liability, adjusted for any advance lease payments paid, initial direct costs incurred, or lease incentives received prior to commencement. Right-of-use assets are subject to evaluation for impairment or disposal on a basis consistent with other long-lived assets.

Operating lease payments are expensed using the straight-line method as an operating expense over the lease term, unless the right-of-use asset reflects impairment. We will then recognize the amortization of the right-of-use asset on a straight-line basis over the remaining lease term with rent expense still included in operating expense in our consolidated statement of operations.

Finance lease assets are amortized to depreciation expense using the straight-line method over the shorter of the useful life of the related asset or the lease term, unless the lease includes a provision that either (i) results in the transfer of ownership of the underlying asset at the end of the lease term or (ii) includes a purchase option whose exercise is reasonably certain. In either of these instances, the right-of-use asset is amortized over the useful life of the underlying asset. Finance lease payments are bifurcated into (i) a portion that is recorded as imputed interest expense and (ii) a portion that reduces the finance lease liability.

We do not separate lease and non-lease components for any of our current asset classes when determining which lease payments to include in the calculation of its lease assets and liabilities. Variable lease payments are expensed in the period incurred. If a lease includes an option to extend or terminate the lease, we reflect the option in the lease term if it is reasonably certain the option will be exercised. Our right of use assets and lease liabilities generally exclude periods covered by renewal options and include periods covered by early termination options (based on our conclusion that it is not reasonably certain that we will exercise such options).

We accounted for the sublease of space in our main Lexington, Massachusetts facility from the perspective of a lessor. Our sublease was classified as an operating lease. We recorded sublease income as a reduction of operating expense.

Operating leases are recorded in “Operating lease right-of-use assets”, “Current portion, operating lease liabilities” and “Operating lease liabilities, net of current portion”, while finance leases are recorded in “Property, plant and equipment, net”, “Other current liabilities” and “Other long-term liabilities” on our consolidated balance sheets.

(v) Recent Accounting Pronouncements

Recently Issued and Adopted

In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024. ASU 2023-09 enhances the transparency and decision usefulness of income tax disclosures, primarily related to the rate reconciliation and income taxes paid information. Weadopted ASU 2023-09 on a retrospective basis for all periods presented. The adoption of ASU 2023-09 had no impact to our consolidated balance sheets, consolidated statements of comprehensive income (loss), or consolidated statements of cash flows, as ASU 2023-09 affects disclosures only. Refer to Note 18, Income Taxes for the related disclosures required by ASU 2023-09.

Recently Issued, Not Yet Adopted

In November 2024, the FASB issued ASU 2024-03, Disaggregation of Income Statement Expenses (DISE). This new guidance requires all public entities to incorporate disclosures about specific types of expenses included in the expense captions presented on the face of the income statement as well as disclosures about selling expenses. Public entities must adopt ASU 2024-03 prospectively for fiscal years beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption and retrospective application are permitted. We are currently evaluating the impact that ASU 2024-03 will have on our consolidated financial statements.

No other new accounting pronouncement issued or effective during the year ended December 31, 2025 had or is expected to have a material impact on our consolidated financial statements or disclosures.

(3) Goodwill and Acquired Intangible Assets

Our goodwill balance was $24.1 million at both December 31, 2025 and 2024. There were no changes to the carrying amount during 2025.

Acquired intangible assets consisted of the following at December 31, 2025 and 2024 (in thousands):

The weighted average amortization period of our finite-lived intangible assets is approximately 9 years. Amortization expense for the years ended December 31, 2025, 2024, and 2023 was$0.3 million,$0.5 million and $1.5 million, respectively. Amortization expense related to acquired intangibles is estimated at,$0.3 million for each of 2026, 2027 and 2028, and $39,000 for 2029.

IPR&D acquired in a business combination is capitalized at fair value until the underlying project is completed and is subject to impairment testing. Once the project is completed, the carrying value of IPR&D is amortized over the estimated useful life of the asset. Post-acquisition research and development expenses related to the acquired IPR&D are expensed as incurred.

(4) Investments

Cash Equivalents

Cash equivalents consisted of the following as of December 31, 2025 and 2024 (in thousands):

As a result of the short-term nature of our investments, there were minimal unrealized holding gains or losses for the years ended December 31, 2025, 2024 and 2023.

Of the investments listed above, all were classified as cash equivalents on our consolidated balance sheets as of December 31, 2025 and 2024.

Investment in MiNK Therapeutics, Inc.

In July 2025, our ownership percentage of MiNK dropped below 50% due to dilution resulting from MiNK selling shares to unrelated investors. While we maintain significant influence, this resulted in a loss of control. As a result, MiNK was deconsolidated in the quarter ended September 30, 2025. As we maintain a significant ownership percentage in MiNK (approximately 46% as of December 31, 2025) we have accounted for this investment under the equity method and have elected the fair value option.

We determined that the loss of control due to dilution does not constitute a strategic shift from our perspective and therefore the deconsolidation is not deemed to be a discontinued operation.

We recognized a $100.9 million gain on deconsolidation in our condensed consolidated statements of operations for the year ended December 31, 2025. This gain is the sum of (1) the fair value of our retained investment in MiNK (2) the carrying amount of the existing noncontrolling interest that was derecognized, and (3) the carrying amount of accumulated other comprehensive income attributable to MiNK, less the carrying amount of MiNK's net liabilities derecognized.

The fair value of our retained investment in MiNK as of the date of deconsolidation was $50.6 million. Fair value was calculated using readily determinable pricing available on a securities exchange.

We will continue to have involvement with MiNK after deconsolidation, including providing services under an Amended and Restated Intercompany Services Agreement, and MiNK has been deemed a related party. Following the deconsolidation, we recognized Related party balances on our Consolidated Balance Sheets.

Following deconsolidation we have accounted for our remaining investment in MiNK according to the equity method in accordance with ASC 323, as we have retained the ability to exercise significant influence but do not have control. In accordance with ASC 825, we have made the irrevocable election to measure our investment and all other eligible interests in MiNK, including the Related party note receivable (the "Note Receivable") (refer to Note 14), at fair value. All subsequent changes in fair value will be reported as part of Non-operating income (expense) in our Condensed Consolidated Statements of Operations.

The fair value of our equity investment in MiNK at December 31, 2025 was $24.3 million. The total carrying value of our investment in MiNK at December 31, 2025, including the fair value of the Note Receivable and the carrying value of the Due from related parties receivable, was approximately $44.9 million.

Our investment in MiNK is considered a significant investee as the carrying value of our total investment is greater than 20% of our total consolidated asset balance. The following tables present summarized balance sheet information as of December 31, 2025 and summarized results of operations for the period since the date of deconsolidation (in thousands):

(5) Restricted Cash

As of December 31, 2025, 2024, and 2023 we maintained non-current restricted cash of $1.7 million, $3.6 million and $3.7 million, respectively. These amounts are included within “Other long-term assets” in our consolidated balance sheets and are comprised of deposits under letters of credit required under our facility leases.

The following table provides a reconciliation of cash, cash equivalents and restricted cash that agrees to the total of the aforementioned amounts shown in our consolidated statements of cash flows as of December 31, 2025, 2024 and 2023, respectively (in thousands):

(6) Property, Plant and Equipment

Property, plant and equipment, net as of December 31, 2025 and 2024 consist of the following (in thousands):

(7) Income Taxes

The following table summarizes the income (loss) before the provision for income taxes by jurisdiction for the periods indicated (in thousands):

Current and deferred income tax in the U.S. and foreign jurisdiction wasnil for the years ended December 31, 2025, 2024 and 2023.

Income taxes recorded differed from the amounts computed by applying the U.S. Federal income tax rate of 21% to loss before income taxes as a result of the following (in thousands):

For all periods presented, state and local income taxes in California and Massachusetts comprise the majority of the domestic state and local income taxes, net of federal effect category.

In each of the years presented there were no cash taxes paid or received.

As of December 31, 2025, we had available net operating loss carryforwards of $992.4 million and $532.5 million for Federal and state income tax purposes, respectively, which are available to offset future Federal and state taxable income, if any, $546.5 million of these Federal and $1.9 million of these State net operating loss carryforwards do not expire, while the remaining net operating loss carryforwards expire between 2026 and 2044. Our ability to use these net operating losses may be limited by change of control provisions under Internal Revenue Code Section 382 and may expire unused. In addition, we have $3.8 million and $1.2 million of Federal and state research and development credits, respectively, available to offset future taxable income. These Federal and state research and development credits expire between 2026 and 2034 and 2026 and 2030, respectively. Additionally, we have $24,000 of state investment tax credits, available to offset future taxable income that expire in 2026. We also have foreign net operating loss carryforwards, which do not expire, available to offset future foreign taxable income of $715,000 in Ireland. Additionally, we have $2.9 million of net operating loss carryforwards, in Switzerland, which begin to expire in 2030. The potential impacts of these provisions are among the items considered and reflected in management’s assessment of our valuation allowance requirements.

Beginning January 1, 2022, the Tax Cuts and Jobs Act (the “Tax Act”) eliminated the option to deduct research and development expenditures in the current year and requires taxpayers to capitalize such expenses pursuant to Internal Revenue Code (“IRC”) Section 174. Under the Tax Act the capitalized expenses are amortized over a 5-year period for domestic expenses and a 15-year period for foreign expenses. On July 4, 2025, the One Big Beautiful Bill Act (“OBBBA”) was enacted in the U.S. The OBBBA contains, among other provisions, changes to the U.S. corporate income tax system, including allowing immediate expensing of U.S. qualifying research and development expenses and allowing taxpayers an election to accelerate the deduction for previously capitalized U.S. research and development costs. The favorable U.S. research and development expenditure provisions increase the net operating loss generated in 2025 but does not have a material impact on the Company’s deferred tax expense as a result of the valuation allowance maintained against the Company’s net deferred tax assets. The Company is electing to continue amortization of the domestic capitalized research and development expenses in 2025. We have included the impact of this provision, which results in capitalized research expense deferred tax assets of approximately $55.9 million and $87.0 million as of December 31, 2025 and 2024, respectively.

The tax effect of temporary differences and net operating loss and tax credit carryforwards that give rise to significant portions of the deferred tax assets and deferred tax liabilities as of December 31, 2025 and 2024 are presented below(in thousands).

In assessing the realizability of deferred tax assets, we consider whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which the net operating loss and tax credit carryforwards can be utilized or the temporary differences become deductible. We consider projected future taxable income and tax planning strategies in making this assessment. In order to fully realize the deferred tax asset, we will need to generate future taxable income sufficient to utilize net operating losses prior to their expiration. Based upon our history of not generating taxable income due to our business activities focused on product development, we believe that it is more likely than not that deferred tax assets will not be realized through future earnings. Accordingly, a valuation allowance has been established for deferred tax assets which will not be offset by the reversal of deferred tax liabilities. The valuation allowance on the deferred tax assets decreased by $6.2 million and increased by $25.0 million during the years ended December 31, 2025 and 2024, respectively.

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands):

We are subject to taxation in the U.S. and in various state, local, and foreign jurisdictions. We remain subject to examination by U.S. Federal, state, local, and foreign tax authorities for tax years 2022 through 2025. With a few exceptions, we are no longer subject to U.S. Federal, state, local, and foreign examinations by tax authorities for the tax year 2021 and prior. However, net operating losses from the tax year 2021 and prior would be subject to examination if and when used in a future tax return to offset taxable income. Our policy is to recognize income tax related penalties and interest, if any, in our provision for income taxes and, to the extent applicable, in the corresponding income tax assets and liabilities, including any amounts for uncertain tax positions.

These unrecognized tax benefits would all impact the effective tax rate if recognized.

(8) Accrued and Other Current Liabilities

Accrued liabilities consist of the following as of December 31, 2025 and 2024 (in thousands):

Other current liabilities consisted of the following as of December 31, 2025 and 2024 (in thousands):

(9) Equity

Effective August 5, 2022, our certificate of incorporation was amended to increase the number of authorized shares of common stock from 400,000,000 to 800,000,000.

Under the terms and conditions of the Certificate of Designation creating the Series A-1 Preferred Stock, this stock is convertible by the holder at any time into our common stock, is non-voting, has an initial conversion price of $1,897.20 per common share, subject to adjustment, and is redeemable by us at its face amount ($31.6 million), plus any accrued and unpaid dividends. The Certificate of Designation does not contemplate a sinking fund. The Series A-1 Preferred Stock ranks senior to our common stock. In a liquidation, dissolution, or winding up of the Company, the Series A-1 Preferred Stock’s liquidation preference must be fully satisfied before any distribution could be made to the holders of the common stock. Other than in such a liquidation, no terms of the Series A-1 Preferred Stock affect our ability to declare or pay dividends on our common stock as long as the Series A-1 Preferred Stock’s dividends are accruing. The liquidation value of this Series A-1 Preferred stock is equal to $1,000 per share outstanding plus any accrued unpaid dividends. Dividends in arrears with respect to the Series A-1 Preferred Stock were approximately $2.7 million or $85.30 per share, and $2.5 million or $78.46 per share, at December 31, 2025 and 2024, respectively.

On July 22, 2020, we filed an Automatic Shelf Registration Statement on Form S-3ASR (file no. 333-240006) (the “First Registration Statement”). The First Registration Statement included both a base prospectus that covered the potential offering, issuance and sale from time to time of common stock, preferred stock, warrants, debt securities and units of Agenus and a prospectus covering the offering, issuance and sale of up to 5.0 million shares of our common stock from time to time in “at-the-market offerings” pursuant to an At Market Issuance Sales Agreement (the “Sales Agreement”) entered into with B. Riley on July 22, 2020. On March 1, 2022, we filed a prospectus supplement in connection with the potential offer and sale of up to an additional 5.0 million shares of common stock pursuant to the Sales Agreement. This First Registration Statement expired in July 2023.

On June 23, 2023, we filed an Automatic Shelf Registration Statement on Form S-3ASR (file no. 333-272911) (the “Second Registration Statement”). The Second Registration Statement included both a base prospectus that covered the potential offering, issuance and sale from time to time of common stock, preferred stock, warrants, debt securities and units of Agenus and a prospectus supplement that covered the potential offer and sale of up to 9.2 million shares of common stock pursuant to the Sales Agreement.

On March 14, 2024, we filed a Post-effective Amendment to an Automatic Shelf Registration Statement on Form POSASR (file no. 333-272911) and a Post-Effective Amendment for Registration Statement on Form POS AM (file no. 333-272911) (together, the “Third Registration Statement”). The Third Registration Statement included both a base prospectus that covered the potential offering, issuance and sale from time to time of up to $300.0 millionof common stock, preferred stock, warrants, debt securities and units of

Agenusand a prospectus supplement for the potential offer and sale of up to 6,725,642 shares of common stock (the “Initial ATM Shares”) in “at the market” offerings pursuant to the Sales Agreement. On August 8, 2024, we filed an additional prospectus supplement for the potential offer and sale of up to an additional 13,834,015 shares of common stock (together with the Initial ATM Shares, the “Placement Shares”) in “at the market” offerings pursuant to the Sales Agreement. Sales pursuant to the Sales Agreement will be made only upon our instruction to the Sales Agent, and we cannot provide assurances that we will issue any additional Placement Shares pursuant to the Sales Agreement.

During the years ended December 31, 2025, 2024 and 2023 we received net proceeds of approximately $36.1 million, $33.0 million and $133.2 million from the sale of approximately 9.7 million shares,3.6 million shares and 4.2 million shares, respectively, of our common stock at an average price per share of approximately $3.84, $9.37 and $32.60, respectively, in at-the-market offerings under the Sales Agreement.

On April 3, 2024, our stockholders approved a proposal to amend our Amended and Restated Certificate of Incorporation, as amended (the “Certificate of Incorporation”), to effect the Reverse Stock Split of our issued and outstanding common stock at a ratio of 1-for-20. On April 4, 2024, we filed a Certificate of Eighth Amendment (the “Certificate of Amendment”) to our Certificate of Incorporation with the Secretary of State of the State of Delaware to effect the Reverse Stock Split. Pursuant to the Certificate of Amendment, the Reverse Stock Split became effective at 12:01 a.m., Eastern Time, on April 12, 2024. As of the opening of trading on April 12, 2024, our common stock began trading on a post-split basis under CUSIP number 00847G 804.

All common share, per share and related information included in the accompanying financial statements and footnote disclosures have been adjusted retroactively, where applicable, to reflect the Reverse Stock Split.

In connection with the Ligand Purchase Agreement described in Note 18, on May 6, 2024, we issued to Ligand a warrant to purchase 867,052 shares of our common stock, at an exercise price equal to $17.30 per share. The exercise price of the Ligand Warrant and the number of shares issuable upon exercise of the Ligand Warrant are subject to adjustments for stock splits, combinations, stock dividends or similar events. The Ligand Warrant is exercisable until May 6, 2029.

On January 10, 2025, we entered into a Payment Agreement with the Medpace, Inc. ("Medpace"), pursuant to which we agreed with Medpace to certain matters related to payments due to Medpace by us under a master services agreement with Medpace dated June 8, 2022. In connection with the agreements set forth in the Payment Agreement, we issued to Medpace in a private issuance 1,318,084 shares of our common stock (the "Medpace Shares"). The Medpace Shares were issued to and were held by Medpace as a deposit and to provide security for our payment obligations to the Medpace under the Payment Agreement.

In connection with a modification of the payment terms as provided for in the Payment Agreement, on December 29, 2025, we entered into a forbearance agreement with Medpace pursuant to which we agreed, among other things, to register for resale the Medpace shares. In addition, Medpace agreed to, under certain circumstances if applicable (including the payment in cash by us of amounts due under the Payment Agreement), return some or all of the Medpace Shares to us. As of and for the year ended December 31, 2025, we deemed these shares to be contingently returnable and as such, the Medpace shares were not deemed outstanding at any time during the year.

In connection with the closing of the Zydus Ageements in January 2026, we fully settled our obligation to Medpace in cash. As such, Medpace returned the 1,318,084 shares to us. No shares were sold by Medpace.

(10) Non-controlling Interest

Non-controlling interest recorded in our consolidated financial statements for the years ended December 31, 2025, 2024 and 2023, relates to the following approximate interests in certain consolidated subsidiaries, which we do not own.

Changes in non-controlling interest for the years ended December 31, 2025, 2024 and 2023 were as follows (in thousands):

Deconsolidation of a subsidiary

In the quarter ended September 30, 2025, we deconsolidated MiNK and derecognized the associated non-controlling interest balance.

Sale of subsidiary shares in private placement

In May 2024, MiNK entered into a Stock Purchase Agreement with a certain investor (the “Purchaser”), pursuant to which MiNK issued and sold an aggregate of 464,000 shares of its Common Stock (the “MiNK Common Shares”), at a purchase price of $12.50 per share. The aggregate purchase price paid by the Purchaser for the MiNK Common Shares was approximately $5.8 million, net of offering expenses.

(11) Share-based Compensation Plans

On April 10, 2019, our Board of Directors adopted, and on June 19, 2019, our stockholders approved, our 2019 Equity Incentive Plan (the “2019 EIP”). On June 17, 2025, June 11, 2024, June 8, 2022 and June 15, 2021, our stockholders approved amendments to the 2019 EIP, increasing the number of shares available for issuance. The 2019 EIP provides for the grant of incentive stock options intended to qualify under Section 422 of the Code, nonstatutory stock options, restricted stock, unrestricted stock and other equity-based awards, such as stock appreciation rights, phantom stock awards, and restricted stock units, which we refer to collectively as Awards, for up to 13.5 million shares of our common stock (subject to adjustment in the event of stock splits and other similar events).

The Board of Directors appointed the Compensation Committee to administer the 2019 EIP. No awards will be granted under the 2019 EIP after June 19, 2029.

In the second quarter of 2019, our Board of Directors adopted, and on June 16, 2020, our stockholders approved the 2019 Employee Stock Purchase Plan (the “2019 ESPP”) to provide eligible employees the opportunity to acquire our common stock in a program designed to comply with Section 423 of the Code. On June 17, 2025, June 12, 2023 and June 15, 2021, our stockholders approved amendments to the 2019 ESPP, increasing the number of shares available for issuance. There are 0.15 million shares reserved for issuance under the 2019 ESPP.

Our Directors’ Deferred Compensation Plan, as amended, permits each outside director to defer all, or a portion of, their cash compensation until their service as a director ends or until a specified date into a cash account or a stock account. On June 17, 2025, June 11, 2024 and June 8, 2022, our stockholders approved amendments to this plan, increasing the number of shares available for issuance. There are 88,750 shares of our common stock reserved for issuance under this plan. As of December 31, 2025,16,363 shares had been issued. Amounts deferred to a cash account will earn interest at the rate paid on one-year Treasury bills with interest added to the account annually. Amounts deferred to a stock account will be converted on a quarterly basis into a number of units representing shares of our common stock equal to the amount of compensation which the participant has elected to defer to the stock account divided by the applicable price for our common stock. The applicable price for our common stock has been defined as the average of the closing price of our common stock for all trading days during the calendar quarter preceding the conversion date as reported by The Nasdaq Capital Market. Pursuant to this plan, a total of 73,459 units, each representing a share of our common stock at a weighted average common stock price of$41.05, had been credited to participants’ stock accounts as of December 31, 2025. The compensation charges for this plan were immaterial for all periods presented.

On November 4, 2015, our Board of Directors adopted and approved our 2015 Inducement Equity Plan (the “2015 IEP”) in compliance with and in reliance on Nasdaq Listing Rule 5635(c)(4), which exempts inducement grants from the general requirement of the Nasdaq Listing Rules that equity-based compensation plans and arrangements be approved by stockholders. In October 2023, our Board of Directors approved an increase to the number of shares available for issuance. There are 175,000 shares of our common stock reserved for issuance under the 2015 IEP.

We primarily use the Black-Scholes option pricing model to value options granted to employees and non-employees, as well as options granted to members of our Board of Directors. All stock option grants have 10-year terms and generally vest ratably over a 3 or 4-year period.

The fair value of each option granted during the periods was estimated on the date of grant using the following weighted average assumptions:

Expected volatility is based exclusively on historical volatility data of our common stock. The expected term of stock options granted is based on historical data and other factors and represents the period of time that stock options are expected to be outstanding prior to exercise. The risk-free interest rate is based on U.S. Treasury strips with maturities that match the expected term on the date of grant.

A summary of option activity for 2025 is presented below:

The weighted average grant-date fair values of options granted during the years ended December 31, 2025, 2024, and 2023, was$3.03, $10.75, and $28.20, respectively.

The aggregate intrinsic value in the table above represents the difference between our closing stock price on the last trading day of fiscal 2025 and the exercise price, multiplied by the number of in-the-money options that would have been received by the option holders had all option holders exercised their options on December 31, 2025 (the intrinsic value is considered to be zero if the exercise price is greater than the closing stock price). This amount changes based on the fair market value of our stock. The total intrinsic value of options exercised during the years ended December 31, 2025, 2024, and 2023, determined on the dates of exercise, was $27,000, $64,000, and $13,000, respectively.

During 2025, 2024, and 2023, all options were granted with exercise prices equal to the market value of the underlying shares of common stock on the grant date other than certain awards dated June 18, 2025, January 17, 2024 and January 16, 2024. In May 2025, our Board of Directors approved certain awards subject to forfeiture in the event stockholder approval was not obtained for an amendment to our 2019 EIP. This approval was obtained in June 2025. Accordingly, these awards have a grant date of June 2025, with an exercise price as of the date the Board of Director's approved the awards in May 2025. In January 2024, our Board of Directors approved certain awards subject to forfeiture in the event stockholder approval was not obtained for an amendment to our 2019 EIP. This approval was obtained in June 2024. Accordingly, these awards have a grant date of June 2024, with an exercise price as of the date the Board of Director's approved the awards in January 2024.

As of December 31, 2025, there was $2.7 million of unrecognized share-based compensation expense related to these stock options and stock options granted under a subsidiary plan which, if all milestones are achieved, will be recognized over a weighted average period of 1.3 years.

Certain employees and consultants have been granted non-vested stock. The fair value of non-vested market-based awards is calculated based on a Monte Carlo simulation as of the date of issuance. The fair value of other non-vested stock is calculated based on the closing sale price of our common stock on the date of issuance.

A summary of non-vested stock activity for 2025 is presented below:

As of December 31, 2025, there was $0.1 million of unrecognized share-based compensation expense related to these non-vested shares and non-vested shares granted under a subsidiary plan which will be recognized over a weighted average period of 0.9 years. The total intrinsic value of shares vested during the years ended December 31, 2025, 2024, and 2023, was $7.8 million, $0.2 million, and $11.5 million, respectively.

Cash received from option exercises and purchases under our 2019 ESPP for the years ended December 31, 2025, 2024, and 2023, was$0.2 million, $0.6 million, and $0.8 million, respectively.

We issue new shares upon option exercises, purchases under our 2019 ESPP, vesting of non-vested stock and under the Directors’ Deferred Compensation Plan. During the years ended December 31, 2025, 2024, and 2023,17,000 shares,16,668 shares, and 2,337 shares, respectively, were issued as a result of stock option exercises. During the years ended December 31, 2025, 2024, and 2023,48,171 shares,30,637 shares, and 22,469 shares, were issued under the 2019 ESPP, respectively. During the years ended December 31, 2025, 2024, and 2023,506,878 shares,17,002 shares, and 4,804 shares, respectively, were issued as a result of the vesting of non-vested stock. Additionally, during the years ended December 31, 2025 and 2023,1,352,929 shares and 232,190 shares, respectively, were issued as payment for certain employee bonuses, with 466,175 and 83,438, respectively, of those shares being withheld to cover taxes, resulting in a net share issuance of 886,754 and 148,752.

The impact on our results of operations from share-based compensation for the years ended December 31, 2025, 2024, and 2023, was as follows (in thousands).

(12) License, Research, and Other Agreements

On December 5, 2014, we entered into a license agreement with the Ludwig Institute for Cancer Research Ltd., or Ludwig, which replaced and superseded a prior agreement entered into between the parties in May 2011. Pursuant to the terms of the license agreement, Ludwig granted us an exclusive, worldwide license under certain intellectual property rights of Ludwig and Memorial Sloan Kettering Cancer Center arising from the prior agreement to further develop and commercialize GITR, OX40 and TIM-3 antibodies. On January 25, 2016, we entered into a second license agreement with Ludwig, on substantially similar terms, to develop CTLA-4 and PD-1 antibodies. Pursuant to the December 2014 license agreement, we made anupfront payment of $1.0 million to Ludwig. The December 2014 license agreement also obligates us to make potential milestone payments of up to $20.0 million for events prior to regulatory approval of licensed GITR, OX40 and TIM-3 products, and potential milestone payments in excess of $80.0 million if such licensed products are approved in multiple jurisdictions, in more than one indication, and certain sales milestones are achieved. Under the January 2016 license agreement, we are obligated to make potential milestone payments of up to $12.0 million for events prior to regulatory approval of CTLA-4 and PD-1 licensed products, and potential milestone payments of up to $32.0 million if certain sales milestones are achieved. Under each of these license agreements, we will also be obligated to pay low to mid-single digit royalties on all net sales of licensed products during the royalty period, and to pay Ludwig a percentage of any sublicensing income, ranging from a low to mid-double digit percentage depending on various factors. The license agreements may each be terminated as follows: (i) by either party if the other party commits a material, uncured breach; (ii) by either party if the other party initiates bankruptcy, liquidation or similar proceedings; or (iii) by us for convenience upon 90 days’ prior written notice. The license agreements also contain customary representations and warranties, mutual indemnification, confidentiality and arbitration provisions.

We have entered into certain clinical collaboration arrangements with third-party biopharmaceutical companies to evaluate the safety and efficacy of combination therapies involving Agenus product candidates. Under these arrangements, we typically contribute clinical-stage product, scientific expertise, and access to certain intellectual property necessary to conduct the studies, while the collaboration partner generally serves as sponsor and is responsible for conducting and funding the clinical trial activities. Each party retains ownership of its respective pre-existing intellectual property, and intellectual property arising directly from the combined research efforts is generally shared between the parties in accordance with the collaboration agreement. The parties independently bear their own development and commercialization costs and may separately pursue commercialization of products derived from the collaboration, subject to the agreed intellectual property rights. For the years ended December 31, 2025, 2024 and 2023 expenses related to these agreements were not material.

We have entered into various cancelable agreements with contract manufacturers, institutions, and clinical research organizations (collectively "third party providers") to perform pre-clinical activities and to conduct and monitor our clinical studies. Under these agreements, subject to the enrollment of patients and performance by the applicable third-party provider, we have estimated our total payments to be $687.0 million over the term of the studies. For the years ended December 31, 2025, 2024, and 2023,$11.5 million, $64.2 million, and $94.5 million, respectively, have been expensed in the accompanying consolidated statements of operations related to these third-party providers. Through December 31, 2025, we have expensed$628.0 million as research and development expenses and $574.6 million of this amount has been paid. The timing of expense reco gnition and future payments related to these agreements is subject to the enrollment of patients and performance by the applicable third-party provider.

(13) Revenue from Contracts with Customers

Pre-commercial Product Revenue

During the year ended December 31, 2025, we began recognizing pre-commercial product revenue for BOT+BAL provided to patients through regulatory-authorized early access pathways under both France’s Authorisation d’Accès Compassionnel ("AAC") framework and paid named patient programs ("NPPs"), where permitted.

Revenue is recognized as the gross amount invoiced to the customer net of reserves for estimated variable consideration (for AAC patients), consisting of government rebates and taxes, when the customer (hospital/physician) obtains control of the product at delivery. The estimated variable consideration is fully constrained until the calculations are finalized with the applicable government authority annually.

For the year ended December 31, 2025, we recognized approximately $4.2 million in revenue under these programs.

Bristol Myers Squibb Company License Agreement

On May 17, 2021, we entered into a License, Development and Commercialization Agreement (“BMS License Agreement”) with Bristol Myers Squibb Company (“BMS”) to collaborate on the development and commercialization of our proprietary anti-TIGIT bispecific antibody program AGEN1777. Pursuant to the BMS License Agreement, we received a non-refundable upfront cash payment of $200.0 million and were eligible to receive up to $1.36 billion in aggregate development, regulatory and commercial milestone payments plus the tiered royalties described below. In July 2021, the BMS License Agreement closed, and we received the $200.0 million upfront payment.

In December 2023, we announced that the first patient was dosed in an AGEN1777 Phase 2 clinical trial, triggering the achievement of a $25.0 million milestone. We received this milestone in January 2024. In October 2021, we announced that the first patient was dosed in the AGEN1777 Phase 1 clinical trial, triggering the achievement of a $20.0 million milestone. We received this milestone in December 2021.

Under the BMS License Agreement, we granted BMS an exclusive worldwide license under certain of our intellectual property rights to develop, manufacture and commercialize AGEN1777 and its derivatives in all fields; provided, we retained an option to access the licensed antibodies for use in clinical studies in combination with certain of our other pipeline assets subject to certain restrictions. In exchange, BMS was responsible for all of the development, regulatory approval, manufacturing and commercialization costs with respect to products containing AGEN1777. On July 30, 2024, we received notice from BMS that it was voluntarily terminating the BMS License Agreement, effective as of January 26, 2025. Upon termination, BMS returned AGEN1777 to us.

License Revenue

We identified a single performance obligation under the BMS License Agreement, the license of AGEN1777 (“AGEN1777 License”). All other promised goods/services were deemed immaterial in the context of the contract. We determined that the AGEN1777 License was both capable of being distinct and distinct within the context of the contract as the AGEN1777 License has significant stand-alone functionality as of contract inception and BMS can begin deriving benefit from the AGEN1777 License without consideration of the immaterial services. The $200.0 million upfront payment was allocated to the single performance obligation and recognized as revenue at contract inception.

For the years ended December 31, 2025 and 2024, no revenue was recognized. For the year ended December 31, 2023, we recognized $25.0 million in research and development revenue related to the achievement of a milestone.

Betta License Agreement

In June 2020, we entered into a license and collaboration agreement (the “Betta License Agreement”) with Betta Pharmaceuticals Co., Ltd. (“Betta”), pursuant to which we granted Betta an exclusive license to develop, manufacture and commercialize balstilimab and zalifrelimab in Greater China. Under the terms of the Betta License Agreement, we received $15.0 million upfront in July 2020 and were eligible to receive up to $100.0 million in milestone payments plus royalties on any future sales in Greater China. In 2025, we notified Betta of the termination of the Betta License Agreement.

For the years ended December 31, 2025, 2024, and 2023 no revenue was recognized.

UroGen License Agreement

In November 2019, we entered into a License Agreement with UroGen Pharma Ltd. (the “UroGen License Agreement”) in which we granted a license of AGEN1884 for use with UroGen's sustained release technology for intravesical delivery in patients with urinary tract cancers. Pursuant to the terms of the UroGen License Agreement, we received an upfront cash payment from UroGen of $10.0 million. We were eligible to receive up to $200.0 million in potential development, regulatory and commercial milestones, as well as 14-20% royalties on net sales of the products containing AGEN1884. In November 2025, Urogen notified us they were terminating the license agreement in accordance with the terms of the agreement.

We identified the following performance obligations under the UroGen License Agreement: (1) the license of AGEN1884 that we granted UroGen, and (2) the clinical supply of AGEN1884 that we agreed to supply to UroGen. We concluded that the combined standalone selling price of the license approximated the $10.0 million upfront fee and as such the full amount was recognized at a point-in-time, upon delivery of the license to UroGen at contract inception. Revenue related to the supply of AGEN1884 is recognized under the “as invoiced” practical expedient.

For the year ended December 31, 2025, no revenue was recognized. For the years ended December 31,2024 and 2023, we recognized approxim ately $0.3 million and $0.1 million, respectively, of research and development revenue related to the UroGen License Agreement.

Gilead Collaboration Agreement

Pursuant to the terms oftwo separate option and license agreements between the parties (each, an “Option and License Agreement” and together, the “Option and License Agreements”), we granted Gilead exclusive options to license exclusively (“License Option”) our bispecific antibody, AGEN1223, and our monospecific antibody, AGEN2373 (together, the “Option Programs”), during the respective Option Periods (defined below). Pursuant to the terms of the Option and License Agreements, we agreed to grant Gilead an exclusive, worldwide license under our intellectual property rights to develop, manufacture and commercialize AGEN1223 or AGEN2373, as applicable, in all fields of use upon Gilead’s exercise of the applicable License Option. In the third quarter of 2021 we ceased development of AGEN1223 and in October 2021 the AGEN1223 option and license agreement was formally terminated. In August 2024, Gilead elected not to exercise the option to license AGEN2373 and the option and license agreement was formally terminated. Gilead was entitled to exercise its License Option for either or both Option Programs at any time up until ninety (90) days following Gilead’s receipt of a data package with respect to the first complete Phase 1b clinical trial for each Option Program (the “Option Period”). During the Option Period, we were responsible for the costs and expenses related to the development of the Option Programs.

Research and Development Revenue

For the years ended December 31, 2025 and 2024, no revenue was recognized. For the year ended December 31, 2023, we recognized research and development revenue of $12.2 million based on the partial satisfaction of the over time performance obligations as of period end.

Incyte Collaboration Agreement

On January 9, 2015, and effective February 19, 2015, we entered into a global license, development and commercialization agreement (the “Collaboration Agreement”) with Incyte pursuant to which the parties plan to develop and commercialize novel immuno-therapeutics using our antibody discovery platforms. The Collaboration Agreement was initially focused onfour checkpoint modulator programs directed at GITR, OX40, LAG-3 and TIM-3. In addition to the four identified antibody programs, the parties have an option to jointly nominate and pursue the development and commercialization of antibodies against additional targets during afive-year discovery period which, upon mutual agreement of the parties for no additional consideration, can be extended for an additional three years. In November 2015, we and Incyte jointly nominated and agreed to pursue the development and commercialization ofthree additional checkpoint targets. In February 2017, we amended the Collaboration Agreement by entering into a First Amendment to License, Development and Commercialization Agreement (the “First Amendment”). In October 2019, we further amended the Collaboration Agreement by entering into a Second Amendment to License, Development and Commercialization Agreement (the “Second Amendment”). See “Amendments” section below.

In October 2022, Incyte notified us of their intent to terminate the OX40 program, effective October 2023. Upon termination, the rights to the OX40 program reverted back to us. In May 2023, Incyte notified us of their intent to terminate both the GITR program and the undisclosed program, effective May 2024. Upon termination, the rights to the GITR program and the undisclosed program reverted back to us. In July 2024, Incyte announced that it would discontinue further development of the LAG-3 program and TIM-3 program and in February 2025, Incyte notified us of their intent to terminate the entire Collaboration Agreement, effective February 2026. Upon termination, the rights to all remaining programs reverted back to us.

Pursuant to the XOMA Royalty Purchase Agreement, we sold to XOMA 33% of the future royalties and 10% of the future milestones that we were entitled to receive from Incyte, excluding the $5.0 million milestone that we recognized in the three months ended September 30, 2018.

Agreement Structure

Under the terms of the Collaboration Agreement, we received non-creditable, nonrefundable upfront payments totaling $25.0 million. In addition, until the Amendment, the parties shared all costs and profits for the GITR, OX40 andtwo of the additional antibody programs on a 50:50 basis (profit-share products), and we were eligible to receive up to $20.0 million in future contingent development milestones under these programs. Until the terminations, Incyte was obligated to reimburse us for all development costs that we incur in connection with the TIM-3, LAG-3 andone of the additional antibody programs (royalty-bearing products) and we were eligible to receive (i) up to $155.0 million in future contingent development, regulatory, and commercialization milestone payments and (ii) tiered royalties on global net sales at rates generally ranging from 6% to 12%. For each royalty-bearing product, we also had the right to elect to co-fund 30% of development costs incurred following initiation of pivotal clinical trials in return for an increase in royalty rates. Additionally, we had the option to retain co-promotion participation rights in the United States on any profit-share product. Through the direction of a joint steering committee, until the Amendment, the parties anticipated that, for each program, we would serve as the lead for pre-clinical development activities through investigational new drug (“IND”) application filing, and Incyte would serve as the lead for clinical development activities. The parties initiated the first clinical trials of antibodies arising from these programs in 2016.

Amendments

Pursuant to the terms of the First Amendment, the GITR and OX40 programs immediately converted from profit-share programs to royalty-bearing programs and we became eligible to receive a flat 15% royalty on global net sales should any candidates from either of these two programs be approved. Incyte is now responsible for global development and commercialization and all associated costs for these programs. In addition, the profit-share programs relating to TIGIT and one undisclosed target were removed from the collaboration, with the undisclosed target reverting to Incyte and TIGIT to Agenus. The terms for the remaining three royalty-bearing programs targeting TIM-3, LAG-3 and one undisclosed target remain unchanged, with Incyte being responsible for global development and commercialization and all associated costs. The Amendment gave Incyte exclusive rights and all decision-making authority for manufacturing, development, and commercialization with respect to all royalty-bearing programs.

In connection with the First Amendment, Incyte paid us $20.0 million in accelerated milestones related to the clinical development of the antibody candidates targeting GITR and OX40.

Pursuant to the terms of the Second Amendment, we transitioned preclinical development and IND preparation of the undisclosed target to Incyte.

Research and Development Revenue

For the years ended December 31, 2025 and 2024, no revenue was recognized. For the year ended December 31, 2023, we recognized approximately $1.4 million of rese arch and development revenue for research and development services provided.

GSK License and Amended GSK Supply Agreements

In July 2006, we entered into a license agreement and a supply agreement with GSK for the use of QS-21 STIMULON (the “GSK License Agreement” and the “GSK Supply Agreement,” respectively). In January 2009, we entered into an Amended and Restated Manufacturing Technology Transfer and Supply Agreement (the “Amended GSK Supply Agreement”) under which GSK has the right to manufacture all of its requirements of commercial grade QS-21 STIMULON. GSK is obligated to supply us (or our affiliates, licensees, or customers) certain quantities of commercial grade QS-21 STIMULON for a stated period of time. Under these agreements, GSK paid an upfront license fee of $3.0 million and agreed to pay aggregate milestones of $5.0 million. In July 2007, the Amended GSK Supply Agreement was further amended, and we were paid an additional fixed fee of $7.3 million. In March 2012 we entered into a First Right to Negotiate and Amendment Agreement amending the GSK License Agreement and the Amended GSK Supply Agreement to clarify and include additional rights for the use of our QS-21 STIMULON (the “GSK First Right to Negotiate Agreement”). In addition, we granted GSK the first right to negotiate for the purchase of the Company or certain of our assets, which such rights expired in March 2017. As consideration for entering into the GSK First Right to Negotiate Agreement, GSK paid us an upfront, non-refundable payment of $9.0 million, $2.5 million of which is creditable toward future royalty payments. As of December 31, 2017, we had received all of the potential $24.3 million in upfront and milestone payments related to the GSK Agreements. We were also generally entitled to receive 2% royalties on net sales of prophylactic vaccines for a period of 10 years after the first commercial sale of a resulting GSK product. We sold these royalty rights to HCR in January 2018 pursuant to the HCR Royalty Purchase Agreement but continue to recognize revenue under the GSK Agreements because the sale to HCR was accounted for as a borrowing arrangement (See Note 18).

The GSK License and Amended GSK Supply Agreements may be terminated by either party upon a material breach if the breach is not cured within the time specified in the respective agreement. The termination or expiration of the GSK License Agreement does not relieve either party from any obligation which accrued prior to the termination or expiration. Among other provisions, the license rights granted to GSK survive expiration of the GSK License Agreement. The license rights and payment obligations of GSK under the Amended GSK Supply Agreement survive termination or expiration, except that GSK's license rights and future royalty obligations do not survive if we terminate due to GSK's material breach unless we elect otherwise.

For the years ended December 31, 2025, 2024 and 2023, we recognized$108.6 million, $101.0 million and $114.6 million, respectively, of non-cash royalty revenue.

Disaggregation of Revenue

The following table presents revenue (in thousands) for years ended December 31, 2025, 2024 and 2023, disaggregated by geographic region and revenue type. Revenue by geographic region is allocated based on the domicile of our respective business operations.

Contract Balances

Contract assets primarily relate to our rights to consideration for work completed in relation to our research and development services performed but not billed at the reporting date. Contract assets are transferred to receivables when the rights become unconditional. Currently, we do not have any contract assets which have not transferred to a receivable. We hadno asset impairment charges related to contract assets in the period. Contract liabilities primarily relate to contracts where we received payments but have not yet satisfied the related performance obligations. The advance consideration received from customers for research and development services or licenses bundled with other promises is a contract liability until the underlying performance obligations are transferred to the customer.

The following table provides information about contract liabilities from contracts with customers (in thousands):

In the year ended December 31, 2025, we did not recognize any revenue from amounts included in the contract asset orthe contract liability balances from performance obligations satisfied in previous periods. None of the costs to obtain or fulfill a contract were capitalized.

(14) 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 forthree 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 $0.4 million for the year ended December 31, 2025 are included as a contra-expense in “Operating expenses” in our Consolidated Statement of Operations and “Due from related parties,” of $15.4 million as of December 31, 2025, in our 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 December 31, 2025, the Note had a principal balance of $5.0 million, an accrued and unpaid interest balance of approximately $179,000 and a market interest rate of 15.0%. In January 2026, the Note was repaid in full.

During the years ended December 31, 2025, 2024 and 2023, our Audit and Finance Committee approved the performance of research and development manufacturing services totaling $20,000, $97,000 and $150,000, respectively, for Protagenic Therapeutics, Inc (“Protagenic”). We are reimbursed for these services on an actual time and materials basis. Dr. Garo H. Armen, our CEO, is Executive Chairman of and has a greater than 10% equity interest in Protagenic.

In 2023, our Audit and Finance Committee approved a contract between Avillion Life Sciences LTD ("Avillion") and Agenus for the performance of up to $450,000 of clinical consulting services. Allison Jeynes, a former member of our Board of Directors, is chief executive officer of Avillion. For the year ended December 31, 2023, approximately $450,000 related to these services is included in “Research and development” expense in our consolidated statements of operations.

In June 2024, Dr. Jennifer Buell 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 years ended December 31, 2025 and 2024, we expensed Wolf Greenfield fees totaling approximately $169,000 and $200,000, 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.

(15) Assets Held for Sale

On June 3, 2025, we entered into an Asset Purchase Agreement (the “Purchase Agreement”) with Zydus, a wholly owned subsidiary of Zydus Lifesciences Limited, for the sale to Zydus of substantially all of the assets comprising our manufacturing operations, including both owned and leased assets (the “Purchased Assets”).

As consideration for the sale of the Purchased Assets, Zydus will pay us $75.0 million at closing (less costs related to closing). The Purchase Agreement also includes potential payments of up to an additional $50.0 million that may be earned based on usage by Agenus of Zydus’ manufacturing business during the 36-month period following the closing.

We also entered into a license agreement with Zydus (the “License Agreement”) under which, upon closing of the Purchase Agreement, Zydus will receive an exclusive license to develop, manufacture and commercialize botensilimab and balstilimab in India and Sri Lanka (the “Territory”) in exchange for a royalty on net sales at a rate of 5%, as may be adjusted by the occurrence of certain contingencies, for a period ending at the later of the expiration of our patent rights in a given country in the Territory or 10 years following first commercial sale in such country.

Additionally, in connection with the Purchase Agreement, we and Zynext Ventures USA LLC (“Zynext”), an indirect wholly-owned subsidiary of Zydus Lifesciences Limited, entered into a Securities Purchase Agreement (the “SPA” and together with the License Agreement and Purchase Agreement the “Zydus Agreements”), pursuant to which Zynext agreed to purchase 2,133,333 shares of our common stock for an aggregate purchase price of approximately $16.0 million, or $7.50 per share.

The Purchase Agreement contains customary representations, warranties and agreements by us and Zydus, indemnification obligations of the parties and certain other obligations of the parties. Closing of the transaction is subject to customary conditions, including receipt of all required government approvals, as well as the entry into a contract manufacturing agreement (under which we will use Zydus for agreed manufacturing needs), and the consummation of the transactions contemplated by the SPA and the License Agreement. The Zydus Agreements closed on January 15, 2026.

During the year ended December 31, 2025, we reached an agreement with the lessor of a substantial portion of leased manufacturing equipment included in the Purchased Assets to obtain title to these assets before the closing of the Purchase Agreement.

The Company determined that the Purchased Assets met the held for sale criteria at December 31, 2025, but did not meet the criteria to be deemed a business nor the criteria to be classified as a discontinued operation. As a result, the related assets and liabilities were included in the separate held-for-sale line items of the asset and liability sections of our Condensed Consolidated Balance Sheets.

We determined that the fair value of the Purchased Assets, less costs to sell, were greater than their carrying value and, as such, no loss on assets held for sale was recorded for the year ended December 31, 2025.

The following table summarizes the assets and liabilities held for sale at December 31, 2025 (in thousands):

(16) Leases

The majority of our operating lease agreements are for the office, research and development and manufacturing space we use to conduct our operations.

We lease space in Lexington, Massachusetts for our manufacturing, research and development, and corporate offices, office space in New York, New York for use as corporate offices and a facility in Emeryville, California for the development of a cGMP manufacturing facility (classified as held for sale as of December 31, 2025). These agreements expire at various times between 2026 and 2036, with options to extend certain of the leases.

We also have finance lease agreements for research and manufacturing equipment that expire at various times between 2026 and 2027.

The components of lease cost recorded in our consolidated statement of operations were as follows (in thousands):

Finance lease cost for the years ended December 31, 2025, 2024 and 2023, includes $2.9 million, $3.8 million and $2.8 million, respectively, related to amortization of the right-of-use assets and $0.2 million, $1.2 million and $2.2 million, respectively, related to interest on the lease liabilities. Variable lease cost for the years ended December 31, 2025, 2024 and 2023, primarily related to common area maintenance, taxes, utilities and insurance associated with our operating leases. Short-term lease cost for the years ended December 31, 2025, 2024 and 2023 was immaterial.

Cash paid for amounts included in the measurement of operating lease liabilities for the years ended December 31, 2025, 2024 and 2023 wasapproximately $2.0 million, $2.4 million and $2.8 million, respectively. Cash paid for amounts included in the measurement of finance lease liabilities for the years ended December 31, 2025, 2024 and 2023 was approximately $7.7 million, $10.5 million and $8.9 million, respectively.

The following table presents supplemental balance sheet information related to our leases as of December 31, 2025 and 2024 (in thousands):

During the years ended December 31, 2025 and 2024, we recognized operating lease right-of-use asset impairment losses of approximately $0.2 million and $0.9 million, respectively, resulting from the abandonment of operating facility leases. These impairment losses are recorded in "other expense" in our consolidated statements of operations and comprehensive income (loss).

During the year ended December 31, 2024, we recognized a $5.3 million gain on the termination oftwo operating facility leases. This gain was recorded in "other expense" in our consolidated statements of operations and comprehensive income (loss).

Maturities of our lease liabilities as of December 31, 2025 were as follows (in thousands):

The weighted-average remaining lease terms and discount rates related to our leases were as follows:

(17) Debt

Debt obligations consisted of the following as of December 31, 2025 and 2024 (in thousands):

As of December 31, 2025, and 2024, the principal amount of our outstanding debt balance was $45.5 million and $35.2 million, respectively.

Zydus Promissory Note

On October 8, 2025, we entered into a Promissory Note Agreement (the “Zydus Note”) with Zydus, for $10.0 million (the “Principal Amount”). The Zydus Note bears interest at 3.81% per annum and matures upon the closing of the Purchase Agreement and SPA (together, the “APA/SPA”), or, if such closings will not occur, within 10 days after notification that the APA/SPA closings will not be consummated. The Zydus Note contains terms and conditions, including representations and warranties, governing its issuance.

Proceeds from the Zydus Note (i) funded the operational expenses of the Emeryville and Berkeley facilities for the fourth quarter of 2025 (which amount, pursuant to the Zydus Note, will be forgiven and not repaid if the APA/SPA close) and (ii) made certain payments owed in respect of assets subject to the Purchase Agreement between the parties.

As collateral for the Zydus Note, we pledged 822,910 shares of common stock of MiNK that are owned by Agenus. We also executed a control agreement related to these shares, which control agreement provides certain rights to Zydus in the event that there is an event of default under the Zydus Note. Upon satisfaction of the obligations under the Zydus Note (including repayment or forgiveness in connection with an APA/SPA closing), the pledge is expected to be released in accordance with the Zydus Note and related agreements.

In connection with the closing of the APA/SPA on January 15, 2026, $7.0 million of the Zydus Note was forgiven and $3.0 million was repaid.

Promissory Note

On November 26, 2024, we, through a subsidiary, entered into a promissory note (the “Note”) with Ocean 1181 LLC (the “Lender”) for a loan in an aggregate principal amount of $22.0 million (the “Loan”). The Loan has a two-year term and is principally secured by our manufacturing facility in Berkeley, CA and parcels of land located in Vacaville, CA (collectively, the “Mortgaged Properties”). In connection with the close of the Zydus APA/SPA in January 2026, the Loan was modified to release the lien on our former manufacturing facility in Berkeley, CA.

We unconditionally guarantee to the Lender the payment and performance of the obligations under the Note. The Loan bears interest at a rate of 12% through November 30, 2025 and 13% from December 1, 2025 through November 30, 2026. Inte rest under the Note is payable monthly, one half in cash and one half of the Company’s common stock. Additionally, $1.8 million of the Loan funds were held back to serve as an interest payment reserve for the Loan.

In March 2025, we and the Lender agreed to increase the principal amount under the Note by $2.75 million. As part of the transaction, we reimbursed the Lender for transaction costs and paid a 1% origination fee, totaling approximately $0.3 million. These amounts are presented net of the liability in our condensed consolidated balance sheets and will be amortized to interest expense over the term of the Loan.

At the closing of the Loan, we paid the Lender 153,003 shares of the Company’s common stock, representing the first month of interest, a 1% origination fee, as well as certain transaction expenses.

The Note contains customary representations, warranties and covenants, including customary events of default, including failure to repay the Loan when due. Any event of default, if not cured or waived in a timely manner, could result in the acceleration of the Loan under the Note.

If we pay off or release any of the Mortgaged Properties within 120 days of the closing of the Loan, then there will be a two percent payoff fee assessed on the released amount. In the event of a disposition of a Mortgaged Property, the loan is subject to prepayment in an amount equal to the amount of the Loan applicable to the disposed Mortgaged Property.

The Loan was accounted for as debt under the guidance of ASU 470: Debt. As part of the transaction, we reimbursed the Lender for transaction costs and paid a 1% origination fee. These costs totaled approximately $0.4 million. Additionally, as stated above, the Lender withheld approximately $1.8 million of the proceeds to serve as an interest payment reserve. We have deemed this amount to represent debt discount. These amounts are presented net of the liability in our consolidated balance sheets and will be amortized to interest expense over the term of the Loan.

Subordinated Notes

On February 20, 2015, we, certain existing investors and certain additional investors entered into an Amended and Restated Note Purchase Agreement (the “2015 Subordinated Notes”) in the aggregate principal amount of $14.0 million and issued five year warrants (the “2015 Warrants”) to purchase 70,000 shares of our common stock at an exercise price of $102.00 per share.

The 2015 Subordinated Notes bear interest at a rate of 8% per annum, payable in cash on the first day of each month in arrears. Among other default and acceleration terms customary for indebtedness of this type, the 2015 Subordinated Notes include default provisions which allow for the noteholders to accelerate the principal payment of the 2015 Subordinated Notes in the event we become involved in certain bankruptcy proceedings, become insolvent, fail to make a payment of principal or (after a grace period) interest on the 2015 Subordinated Notes, default on other indebtedness with an aggregate principal balance of $13.5 million or more if such default has the effect of accelerating the maturity of such indebtedness, or become subject to a legal judgment or similar order for the payment of money in an amount greater than $13.5 million if such amount will not be covered by third-party insurance.

In February 2020 we repaid $0.5 million of the 2015 Subordinated Notes and in April 2020 we repaid an additional $0.5 million of the 2015 Subordinated Notes and cancelled the related warrants.

On November 30, 2022, we entered into an Amendment to Notes, Termination of Warrants and Sale of New Warrants (the “2022 Amendment”) pursuant to which we:

•

extended the maturity date of the $13.0 million 2015 Subordinated Notes by two years from February 20, 2023 to February 20, 2025;

•

terminated the warrants held by such noteholders to purchase 65,000 shares of the Company’s common stock previously issued in 2015;

•

terminated the warrants held by such noteholders to purchase 32,500 shares of the Company’s common stock previously issued in 2020; and

•

issued to such noteholders new warrants to purchase 65,000 shares of the Company’s common stock that will expire February 20, 2026 and issued new warrants to purchase 32,500 shares of the Company’s common stock that will expire

February 20, 2028, all such warrants having an exercise price of $56.80 per share, which represented a 15% premium over the 30-day average trailing closing price of the Company’s common stock for the period ending November 9, 2022, and (the “New Warrants”).

In February 2025, we entered into an Amendment to Notes, Amendment of Warrants and Sale of New Warrants (the “Amendment”) with existing noteholders, pursuant to which we:

•

extended the maturity date of $10.5 million of the 2015 Subordinated Notes from February 20, 2025 to June 20, 2026;

•

increased the interest rate under the 2015 Subordinated Notes from 8% to 9% per annum;

•

secured the obligation to pay the 2015 Subordinated Notes by the grant of a subordinate mortgage on our manufacturing facility in Berkeley, CA and parcels of land located in Vacaville, CA;

•

extended the expiration date of all 2022 A warrants to purchase shares of the Company’s common stock (the “A Warrants”) and 2022 B warrants to purchase shares of the Company’s common stock (the “B Warrants”) held by such noteholders to purchase a total of 97,500 shares of the Company’s common stock previously issued in 2022 to February 20, 2030 and changed the exercise price to $3.25 per share, which represented a 60-day volume weighted average price as of February 14, 2025 (the “Amended A Warrants” and “Amended B Warrants”);

•

issued to certain noteholders new warrants to purchase 67,500 shares of the Company’s common stock to expire February 20, 2030, and have an exercise price of $3.25 per share, (the “C Warrants” and, together with the Amended A Warrants and the Amended B Warrants, the “New Warrants”);

•

committed to registering the New Warrants with the SEC within ninety (90) days after February 20, 2025; and

•

provided that if we conduct a financing of greater than $10.0 million at a price per share below $3.25 before February 20, 2026, the exercise price on the New Warrants will be reduced to the same price at which such financing was conducted.

This Amendment was accounted for as a debt modification. As part of the Amendment, we recorded a debt discount of approximately $0.4 million, representing the fair value of the new and modified warrants. This amount is presented net of the liability in our condensed consolidated balance sheets and will be amortized to interest expense over the term of the 2015 Subordinated Notes.

In connection with the closing of the Zydus APA/SPA in January 2026, approximately $5.4 million of the 2015 Subordinated Notes were repaid and the lien on our former manufacturing facility in Berkeley, CA was released.

(18) Liability Related to the Sale of Future Royalties and Milestones

The following table shows the activity within the liability account in the year ended December 31, 2025 and for the period from the inception of the royalty transactions to December 31, 2025 (in thousands):

Healthcare Royalty Partners

On January 6, 2018, we, through Antigenics, entered into the HCR Royalty Purchase Agreement with HCR, which closed on January 19, 2018. Pursuant to the terms of the HCR Royalty Purchase Agreement, we sold to HCR 100% of Antigenics’ worldwide rights to receive royalties on sales of GSK’s vaccines containing our QS-21 STIMULON adjuvant. At closing, we received gross proceeds of $190.0 million from HCR. As part of the transaction, we reimbursed HCR for transaction costs of $100,000 andincurred approximately$500,000 in transaction costs of our own, which are presented net of the liability in the consolidated balance sheet and will be amortized to interest expense over the estimated life of the HCR Royalty Purchase Agreement. Although we sold all of our rights to receive royalties on sales of GSK’s vaccines containing QS-21, as a result of our obligation to HCR, we are required to account for the $190.0 million in proceeds from this transaction as a liability on our consolidated balance sheets that will be relieved in proportion to the royalty payments from GSK to HCR over the estimated life of the HCR Royalty Purchase Agreement. The liability is classified between the current and non-current portion of liability related to sale of future royalties and milestones in the consolidated balance sheets based on the estimated royalty payments to be received by HCR in the next 12 months from the financial statement reporting date.

In the years ended December 31, 2025, 2024 and 2023, we recognized $108.6 million, $101.0 million and $114.6 million, respectively, of non-cash royalty revenue and we recorded $33.2 million, $106.7 million and $100.3 million, respectively, of related non-cash interest expense related to the HCR Royalty Purchase Agreement.

As royalties are remitted to HCR from GSK, the balance of the recorded liability will be effectively repaid over the life of the HCR Royalty Purchase Agreement. To determine the amortization of the recorded liability, we are required to estimate the total amount of future royalty payments to be received by HCR. The sum of these royalty amounts less the $190.0 million proceeds we received will be recorded as interest expense over the life of the HCR Royalty Purchase Agreement. Periodically, we assess the estimated royalty payments to be paid to HCR from GSK, and to the extent the amount or timing of the payments is materially different from our original estimates, we will prospectively adjust the amortization of the liability, and the related recognition of interest expense. Since the inception of the HCR Royalty Purchase Agreement our estimate of the effective annual interest rate over the life of the agreement decreased to 20.4%, which results in a retrospective interest rate of 24.1%.

There are a number of factors that could materially affect the amount and timing of royalty payments from GSK, all of which are not within our control. Such factors include, but are not limited to, changing standards of care, the introduction of competing products, manufacturing or other delays, biosimilar competition, patent protection, adverse events that result in governmental health authority imposed restrictions on the use of the drug products, significant changes in foreign exchange rates, and other events or circumstances that could result in reduced royalty payments from GSK, all of which would result in a reduction of non-cash royalty revenues and the non-cash interest expense over the life of the HCR Royalty Purchase Agreement. Conversely, if sales of GSK’s vaccines containing QS-21 are more than expected, the non-cash royalty revenues and the non-cash interest expense recorded by us would be greater over the life of the HCR Royalty Purchase Agreement.

Pursuant to the HCR Royalty Purchase Agreement, we were also entitled to receive up to $40.4 million in milestone payments from HCR (through the royalty payments from GSK) based on sales of GSK’s vaccines as follows: (i) $15.1 million upon reaching $2.0 billion last-twelve-months net sales any time prior to 2024 and (ii) $25.3 million upon reaching $2.75 billion last-twelve-months net sales any time prior to 2026. In the fourth quarter of 2019, the $15.1 million milestone was achieved, as sales for the year ended December 31, 2019 exceeded $2.0 billion. In the second quarter of 2022, the final milestone was achieved, as sales for the 12 months ended June 30, 2022 exceeded $2.75 billion. As such, we recognized royalty sales milestone revenue of $25.3 million during the year ended December 31, 2022. This milestone waspaid through royalties received from GSK.

XOMA

On September 20, 2018, we, through our wholly-owned subsidiary, Agenus Royalty Fund, LLC, entered into a Royalty Purchase Agreement (the “XOMA Royalty Purchase Agreement”) with XOMA (US) LLC (“XOMA US”). Pursuant to the terms of the XOMA Royalty Purchase Agreement, XOMA US paid us $15.0 million at closing in exchange for the right to receive 33% of the future royalties and 10% of the future milestones that we were then entitled to receive from Incyte and Merck Sharp & Dohme (“Merck”) under our agreements with each party (see Note 13), net of certain of our obligations to a third party and excluding the $5.0 million milestone from Incyte that we recognized in the quarter ended September 30, 2018. We retained 90% of the future milestones and 67% of the future royalties under our agreements with Incyte and Merck. Although we sold our rights to receive 33% of future royalties and 10% of future milestones, as a result of our significant continued involvement in the generation of the potential royalties and milestones, we are required to account for the full amount of these royalties and milestones as revenue when earned, and we recorded the $15.0 million in proceeds from this transaction as a liability on our consolidated balance sheet. Under the terms of the XOMA Royalty Purchase Agreement, should the percentage of milestones and royalties ultimately received by XOMA US fail to repay the amount received by us at closing we would have no further obligation to XOMA US. No royalty or milestone revenue was recognized under this agreement in the years ended December 31, 2025, 2024 or 2023.

Ligand Pharmaceuticals

In May 2024, we and certain wholly-owned subsidiaries, entered into a Purchase and Sale Agreement (the "Ligand Purchase Agreement") with Ligand Pharmaceuticals Incorporated ("Ligand"). Pursuant to the terms of the Ligand Purchase Agreement, Ligand will receive (i)31.875% of the development, regulatory and commercial milestone payments we were then eligible to receive under our agreements with BMS, UroGen, Gilead, Merck and Incyte, (the “Covered License Agreements”) (ii)18.75% of the royalties the Company receives under the Covered License Agreements; and (iii) a 2.625%synthetic royalty on worldwide net sales of botensilimaband balstilimab (collectively the “Purchased Assets”). In the event that we relicense the programs in the Covered License Agreements, Ligand would retain its economic interest in any new agreement.

The total amounts payable to Ligand are subject to a 50% reduction in the event total payments to Ligand exceed a specified return hurdle. The synthetic royalty is subject to a reduction if annual worldwide net sales exceed a specified level, and a cap on annual worldwide net sales if annual worldwide net sales exceed a higher specified level. The synthetic royalty can increase by 1% based on the occurrence of certain future events.

In consideration for the sale of the Purchased Assets, we received gross proceeds of $75.0 million, less $0.9 million in reimbursable expenses, on the closing date. In addition, Ligand has a time-based option to invest an additional $25.0 million on a pro rata basis ("Purchaser Upsize Option"), which expired on June 30, 2025.

In connection with the sale of the Purchased Assets, we issued to Ligand awarrant (the "Ligand Warrant") to purchase 867,052 shares of our common stock, at an exercise price equal to $17.30 per share. See Note 9 - Equity for further detail.

The $75.0 million in gross proceeds was allocated to the identified components as follows (in thousands):

As a result of our significant continuing involvement in the generation of the cash flows of the Purchased Assets, we are required to account for $63.9 million of the proceeds from this transaction as a liability on our condensed consolidated balance sheet that will be recognized into revenue in proportion to the royalty and milestone payments paid to Ligand over the estimated life of the Ligand Purchase Agreement.

The Purchaser Upsize Option is considered a freestanding financial instrument as it is separately exercisable and can be legally transferred from the Ligand Purchase Agreement. As such, it is accounted for as a written option which is accounted for as a liability at fair value and remeasured at each balance sheet date with changes in fair value recorded in earnings. The fair value of the Purchaser Upsize Option at December 31, 2025 was nil as it expired unexercised. The fair value of the Purchaser Upsize Option at December 31, 2024 was $69,200.

The Ligand Warrant is considered a freestanding financial instrument as it is separately exercisable and can be legally transferred from the Ligand Purchase Agreement, which was determined to be equity-classified under ASC 815.

To allocate the proceeds, the Purchaser Upsize Option liability and equity-classified Ligand Warrants were recognized based on their fair values and the residual was allocated to a liability related to the sale of future royalties and milestones on our consolidated balance sheets.

During theyears ended December 31, 2025 and 2024, we recorded $17.9 million and $10.6 million of non-cash interest expense related to the Ligand Purchase Agreement, respectively.

As royalties are remitted to us and milestone and sales are earned from the Purchased Assets, the balance of the recorded liability will be effectively repaid over the life of the Ligand Purchase Agreement. To determine the amortization of the recorded liability, we are required to estimate the total amount of future payments that Ligand is entitled to under the Ligand Purchase Agreement. The sum of these amounts less the $63.9 million proceeds allocated to the liability related to sale of future royalties and milestones will be recorded as interest expense over the life of the Ligand Purchase Agreement. Periodically, we assess the estimated royalty and milestone payments to be received and salesto be earned under the Ligand Purchase Agreement, and to the extent the amount or timing of the payments is materially different from our original estimates, we will prospectively adjust the amortization of the liability, and the related recognition of interest expense. As of December 31, 2025, our estimate of the effective annual interest rate over the life of the Ligand Purchase Agreement decreased to 21.0%, which results in a life of contract interest rate of 21.4%.

(19) Fair Value Measurements

Assets and liabilities measured at fair value are summarized below (in thousands):

We measure the Related party note receivable at fair value. The fair value of the Note Receivable at December 31, 2025 was approximately $5.2 million, using a scenario based present value methodology that was derived by evaluating the nature and terms of the Note Receivable and considering the prevailing economic and market conditions at the balance sheet date, some of which are considered Level 2 inputs under the fair value measurements standard. As of December 31, 2025, the Note Receivable had a principal balance of $5.0 million.

Our long-term equity investment in MiNK is measured at fair value and is calculated using readily determinable pricing available on a securities exchange and is classified as a Level 1 asset.

Other Long-term investments are included in "Other long-term assets" in our consolidated balance sheets.

There were no changes in the valuation techniques during the period and there wereno transfers into or out of Levels 1 and 2.

We measured our contingent purchase price consideration at fair value. Our remaining contingent purchase price consideration expired in the year ended December 31, 2025. The fair values of our contingent purchase price consideration of$0.3 million as of December 31, 2024, included in "Other long-term liabilities" in our consolidated balance sheets, were based on significant inputs not observable in the market, which required them to be reported as Level 3 liabilities within the fair value hierarchy. The valuation of these liabilities used assumptions we believed would be made by a market participant and were mainly based on estimates from a Monte Carlo simulation of our share price, as well as other factors impacting the probability of triggering the milestone payments. Share price was evolved using a geometric Brownian motion, calculated daily for the life of the contingent purchase price consideration.

The fair value of our outstanding debt balance at December 31, 2025 and 2024 was$45.7 million and$36.3 million, respectively, based on the Level 2 valuation hierarchy of the fair value measurements standard using a present value methodology which was derived by evaluating the nature and terms of each note and considering the prevailing economic and market conditions at the balance sheet date. The principal amount of our outstanding debt balance at December 31, 2025 and 2024 was $45.5 million and $35.2 million, respectively.

(20) Contingencies

In September 2024, a putative securities class action lawsuit captioned In re Agenus Inc. Securities Litigation, No. 1:24-cv-12299, was filed in the U.S. District Court for the District of Massachusetts (the “Court”) against the Company and certain of its executives and directors. The Court appointed a lead plaintiff pursuant to the Private Securities Litigation Reform Act, and the lead plaintiff filed an amended complaint on February 7, 2025. The amended complaint alleges that Agenus, three of its current officers, and one member of its advisory board violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 thereunder, by making false and misleading statements and omissions of material fact related to the efficacy and commercial prospects of botensilimab and balstilimab. The lead plaintiff seeks to represent all persons who purchased or otherwise acquired Agenus securities between January 23, 2023, and July 17, 2024, and seeks damages and interest, and an award of costs, including attorneys’ fees. On April 8, 2025, the Company moved to dismiss the securities class action. On June 6, 2025 plaintiff filed an opposition to the motion to dismiss, and on July 7, 2025, the Company filed its reply brief. Oral argument on the motion to dismiss was held on March 3, 2026. As of the date of this filing, the Company’s motion to dismiss is pending before the court. We are unable to estimate a range of loss, if any, that could result were there to be an adverse decision in this action.

The Company has been served with four derivative actions filed in the Court between November 2024 and January 2025 by purported stockholders. The actions name certain of the Company’s executives and directors and allege that defendants made false or misleading statements and omissions of material fact related to the efficacy and commercial prospects of botensilimab and balstilimab. Plaintiffs seek an award of damages and an order directing the Company to reform and improve its corporate governance and internal procedures. On May 2, 2025, the Court consolidated the four actions in Case No. 1:24-cv-12823 and stayed all deadlines pending future developments in the securities class action. We are unable to estimate a range of loss, if any, that could result were there to be an adverse decision in this action.

In September 2024, the Company received a subpoena from the Boston Regional Office of the U.S. Securities and Exchange Commission seeking records relating to certain of our product candidates, correspondence with the FDA, public disclosure, and other matters. We have produced records pursuant to the subpoena. We are unable to estimate a range of loss, if any, that could result were there to be an adverse decision in this action.

(21) Benefit Plans

We sponsor a defined contribution 401(k) Savings Plan in the US and a defined contribution Group Personal Pension Plan in the UK (the “Plans”) for all eligible employees, as defined in the Plans. Participants may contribute a portion of their compensation, subject to a maximum annual amount, as established by the applicable taxing authority. Each participant is fully vested in his or her contributions and related earnings and losses. During the years ended December 31, 2025, 2024, and 2023 we made discretionary contributions to the Plans of $0.7 million, $1.3 million, and $1.3 million, respectively. For the years ended December 31, 2025, 2024, and 2023, we expensed $0.7 million, $1.3 million, and $1.3 million, respectively, related to the discretionary contribution to the Plans.

(22) Segment and Geographic Information

Segments

We are managed and currently operate astwo segments. However, we have concluded that our operating segments meet the criteria required by ASC 280 to be aggregated intoone reportable segment. Our operating segments have similar economic characteristics and are similar with respect to the five qualitative characteristics specified in ASC 280. Accordingly, we haveone reportable segment. Ourone reportable segment is focused on the discovery, development and manufacturing of a comprehensive pipeline of immunological agents designed to expand patient populations benefiting from cancer immunotherapy.

Our Chief Executive Officer (“CEO”) serves as our Chief Operating Decision Maker (“CODM”) and is responsible for reviewing company performance and making decisions regarding resource allocation. Our CODM evaluates company performance based on net loss, as included in the Consolidated Statements of Operations and Comprehensive Income (Loss), ensuring resource allocation decisions support company goals. The measure of segment assets is total assets, as included in the Consolidated Balance Sheets. Refer to the consolidated financial statements for other financial information regarding our single reportable segment.

The following table presents selected financial information related to our single reportable segment for the years ended December 31, 2025, 2024, and 2023 (in thousands):

In the table above, “Other operating expenses” includes items such as depreciation and amortization expense, stock-based compensation expense, fair value adjustments and expenses related to certain foreign subsidiaries.

Geographic Information

The following is geographical information regarding our revenues for the years ended December 31, 2025, 2024 and 2023 and our long-lived assets as of December 31, 2025 and 2024 (in thousands):

In the table above, revenue by geographic region is allocated based on the domicile of our respective business operations.

In the table above, long-lived assets include “Property, plant and equipment, net” and “Other long-term assets” from the consolidated balance sheets, by the geographic location where the asset resides.

(23) Subsequent Events

At the Market Offerings

During the period of January 1, 2026 through March 12, 2026, we received net proceeds of approximately $0.8 million under the Sales Agreement.

Receipt of Related Party Note Receivable from MiNK

In January 2026, in accordance with the terms of the note agreement, MiNK paid us approximately $5.2 million, representing the full principal and accrued interest balance.

Zydus Closing

On January 15, 2026, the Zydus Purchase Agreement and SPA closed and we received consideration of $91.0 million, less certain reimbursable expenses, other required closing payments, including transaction expenses of approximately $5.8 million, and $7.5 million that is to be held in twelve-month escrow. At closing the Purchased Assets and related liabilities, including without limitation real estate, equipment and certain assumed contracts transferred to Zydus.

In connection with the closing under the Purchase Agreement and SPA, the License Agreement also became effective.

Liabilities Settled in Connection with the Zydus Closing

In connection with the closing of the Zydus agreements we:

•

Repaid $3.0 million of the Zydus Promissory Note and the remaining $7.0 million was forgiven;

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paid approximately $8.3 million to the lessor of a substantial portion of leased manufacturing equipment included in the Purchased Assets, settling all obligations;

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repaid approximately $5.4 million of the 2015 Subordinated Notes; and

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fully settled our obligation to Medpace. Subsequently, Medpace returned all of the contingently returnable shares to us as our obligations to Medpace were fully satisfied. No shares were sold by Medpace.

Ligand Warrant Modification

In January 2026, we entered into an amendment and release agreement (the “Amendment Agreement”) with Ligand related to the Ligand Purchase Agreement and Ligand Warrant. The Amendment Agreement provided for a release by Ligand of liens it had on certain of the Company’s assets in exchange for a modification of the exercise price under the Ligand Warrant from $17.30 per share to $7.50 per share.