ZEVRA THERAPEUTICS, INC.

A. Description of Business, Basis of Presentation, and Significant Transactions

Organization

Zevra Therapeutics, Inc. (the “Company” or “Zevra”) is a commercial-stage company with a late-stage pipeline committed to bringing life-changing therapeutics to people living with rare diseases. The Company is focused on expanding patient access, progressing our pipeline toward key milestones, and delivering meaningful outcomes for patients with significant unmet needs.

On September 20, 2024, the U.S. Food and Drug Administration (“FDA”) approved the New Drug Application (“NDA”) for MIPLYFFA® (arimoclomol), an orally-delivered treatment for Niemann-Pick disease type C (“NPC”), which is an ultra-rare and progressive neurodegenerative disease. MIPLYFFA, the first FDA-approved treatment for NPC, is indicated for use in combination with miglustat for the treatment of neurological manifestations of NPC in adult and pediatric patients two years of age and older. MIPLYFFA has also been granted orphan medicinal product designation for the treatment of NPC by the European Commission. The Company's other commercial stage asset, OLPRUVA® (sodium phenylbutyrate) for oral suspension, is approved by the FDA for the treatment of certain urea cycle disorders (“UCDs”).

Additionally, the Company has a pipeline of investigational product candidates, including celiprolol for the treatment of Vascular Ehlers-Danlos syndrome (“VEDS”) in patients with a confirmed type III collagen mutation and KP1077, the Company's clinical development product candidate being developed to treat idiopathic hypersomnia (“IH”), a rare neurological sleep disorder, and narcolepsy. The sole active pharmaceutical ingredient of KP1077 is serdexmethylphenidate (“SDX”), the Company's proprietary prodrug of d-methylphenidate (“d-MPH”). The FDA has granted KP1077 orphan drug designation for the treatment of IH.

Basis of Presentation

The Company prepared the consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the rules and regulations of the Securities and Exchange Commission (“SEC”) and, in the Company’s opinion, reflect all adjustments, including normal recurring items that are necessary. All significant intercompany accounts and transactions have been eliminated in consolidation.

Registration Statements on Form S-3

On February 5, 2024, Zevra filed a registration statement on Form S-3 (File No. 333-276856) registering an aggregate of 2,269,721 shares of Zevra’s common stock. On April 5, 2024, the Company filed an amendment to such registration statement, which was declared effective on April 8, 2024.

On June 4, 2024, the Company filed a registration statement on Form S-3 (File No. 333-279941) (the “June 2024 Registration Statement”) under which the Company may sell securities, including as may be issuable upon conversion, redemption, repurchase, exchange or exercise of securities, in one or more offerings up to a total aggregate offering price of $350.0 million, $75.0 million of which was allocated to the sale of the shares of common stock issuable under the 2024 ATM Agreement (as described further below). The registration statement was declared effective on June 13, 2024.

August 2024 Offering

On August 8, 2024, the Company entered into an underwriting agreement (the “Underwriting Agreement”) with Cantor Fitzgerald & Co. and William Blair & Company, L.L.C., as representatives of the several underwriters named therein (collectively, the “Underwriters”), in connection with the offering, issuance and sale by the Company of 9,230,770 shares of the Company’s common stock at a public offering price of $6.50 per share, pursuant to the June 2024 Registration Statement and a related prospectus supplement dated August 8, 2024, filed with the SEC (the “August 2024 Offering”). Under the terms of the Underwriting Agreement, the Company also granted the Underwriters an option exercisable for 30 days to purchase up to an additional 1,384,615 shares of its common stock at the public offering price, less underwriting discounts and commissions, which the Underwriters exercised in full on August 9, 2024. The August 2024 Offering closed on August 12, 2024. Total shares issued were 10,615,385. Net proceeds from the offering were approximately $64.5 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by the Company. The Company is using the net proceeds of the offering to support the commercialization of its approved products and the continued development of its product candidates, and for other general corporate purposes.

Entry into 2024 ATM Agreement

On July 12, 2024, the Company entered into an equity distribution agreement (the “2024 ATM Agreement”) with Citizens JMP Securities LLC (“Citizens JMP”) under which the Company may offer and sell, from time to time at its sole discretion, shares of its common stock having an aggregate offering price of up to $75.0 million through Citizens JMP as its sales agent. The issuance and sale, if any, of common stock by the Company under the 2024 ATM Agreement will be made pursuant to the June 2024 Registration Statement, the accompanying prospectus, and the related prospectus supplement dated July 12, 2024. Citizens JMP may sell the common stock by any method permitted by law deemed to be an “at the market offering” as defined in Rule 415 of the Securities Act. Citizens JMP will use commercially reasonable efforts to sell the common stock from time to time, based upon instructions from the Company (including any price, time or size limits or other customary parameters or conditions the Company may impose). The Company will pay Citizens JMP a commission equal to 3.0% in the aggregate of the gross sales proceeds of any common stock sold through Citizens JMP under the 2024 ATM Agreement. As of December 31, 2025, no shares have been issued or sold under the 2024 ATM Agreement.

Reclassifications

Certain reclassifications were made to the 2024 consolidated financial statements to conform to the classifications used in 2025. These reclassifications had no impact on the consolidated net income (loss), changes in stockholder's equity, or cash flows previously reported.

B. Summary of Significant Accounting Policies

Use of Estimates

The preparation of these consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.

On an ongoing basis, the Company evaluates its estimates and assumptions, including those related to revenue recognition, the useful lives of property and equipment, the recoverability of long-lived assets, the incremental borrowing rate for leases, and assumptions used for purposes of determining stock-based compensation, income taxes, the fair value of the warrant liability and discount and rebate liabilities, among others. The Company bases its estimates on historical experience and on various other assumptions that it believes to be reasonable, the results of which form the basis for making judgments about the carrying value of assets and liabilities.

Concentration of Credit Risk

Financial instruments that potentially expose the Company to concentrations of credit risk consist principally of cash on deposit and investments with multiple financial institutions, the balances of which frequently exceed insured limits, and accounts receivable, which are concentrated amongst a limited number of customers.

Cash and Cash Equivalents

The Company considers any highly liquid investments with an original maturity of three months or less to be cash equivalents.

Investments

The Company maintains investment securities that are classified as available-for-sale securities for which the Company has elected the fair value option under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 825, Financial Instruments. As such, these securities are carried at fair value with unrealized gains and losses included in fair value adjustment related to investments on the consolidated statements of operations. The securities primarily consist of U.S. Treasury securities and corporate bonds and are included in securities at fair value in the consolidated balance sheets. As of December 31, 2025, and 2024, the Company held securities with an aggregate fair value of $176.5 million and $41.7 million, respectively, that contained an aggregate unrealized gain of approximately $149,000 and an aggregate unrealized loss of approximately $18,000, respectively. For securities held at December 31, 2025, $128.6 million mature within one year and $47.9 million mature in one to three years. Applying fair value accounting to these debt securities more accurately represents the Company's investment strategy due to the fact that excess cash is currently being invested for the purpose of funding future operations. Interest income is recognized as earned using an effective yield method giving effect to the amortization of premium and accretion of discount and is based on the economic life of the securities. Interest income is included in interest and other income, net, in the consolidated statements of operations.

Variable Interest Entities

The primary beneficiary of a variable interest entity (“VIE”) is required to consolidate the assets and liabilities of the VIE. When the Company obtains a variable interest in another entity, it assesses at the inception of the relationship and upon occurrence of certain significant events whether the entity is a VIE, and if so, whether the Company is the primary beneficiary of the VIE based on its power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the Company's obligation to absorb losses or the rights to receive benefits from the VIE that could potentially be significant to the VIE.

To assess whether the Company has the power to direct the activities of the VIE that most significantly impact the VIE's economic performance, the Company considers all the facts and circumstances, including the Company's role in establishing the VIE and the Company's ongoing rights and responsibilities. The assessment includes identifying the activities that most significantly impact the VIE's economic performance and identifying which party, if any, has the power to direct those activities. In general, the parties that make the most significant decisions affecting the VIE (management and members of the Board of Directors) are deemed to have the power to direct the activities of a VIE.

To assess whether the Company has the obligation to absorb losses of the VIE or the rights to receive benefits from the VIE that could potentially be significant to the VIE, the Company considers all of its economic interests that are deemed to be variable interests in the VIE.

This assessment requires judgment in determining whether these interests, in the aggregate, are considered potentially significant to the VIE. As of December 31, 2025, and 2024, the Company identified Acer Therapeutics, Inc. (“Acer”) to be the Company's sole interest in a VIE. As Zevra is the final decision maker for all of Acer's research, development, and commercialization of drug candidates that it is producing, the Company directs the activities of Acer that most significantly impact its performance. Therefore, the Company is the primary beneficiary of this VIE for accounting purposes and consolidates the assets and liabilities of the VIE.

Goodwill and Intangible Assets

Goodwill represents the excess of the consideration transferred over the fair value of the net assets acquired when accounted for using the acquisition method of accounting for business combinations. Goodwill is not amortized but is evaluated for impairment within the Company’s single reporting unit on an annual basis, during the fourth quarter, or more frequently if an event occurs or circumstances change that would more-likely-than-not reduce the fair value of the Company’s reporting unit below its carrying amount. The Company establishes its reporting units based on the organizational structure and has determined it hasone reporting unit. In performing its analysis, in accordance with ASC 350, the Company has the option to first assess qualitatively whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. In performing qualitative assessments, the Company considers, among other factors, macroeconomic conditions, the Company’s overall financial performance (including, but not limited to, comparisons to prior periods, current period internal expectations, and comparable peer companies), broader industry and market considerations, and the trading price performance of the Company’s common stock.

The Company's goodwill balance was $4.7 million as of December 31, 2025, and 2024. As of December 31, 2025, and 2024, the Company completed its annual qualitative assessment under ASC 350 to determine whether the existence of events or circumstances indicated that it was more likely than not that the fair value of its reporting unit was less than its respective carrying value. The Company concluded that based on the relevant events and circumstances, it was more likely than not that the reporting unit’s fair value exceeded its related carrying value and therefore no quantitative assessment was required. No goodwill impairment charges were recorded for the years ended December 31, 2025, or 2024.

Acquired in-process research and development (“IPR&D”) that the Company acquires in conjunction with the acquisition of a business represents the fair value assigned to incomplete research projects which, at the time of acquisition, have not reached technological feasibility. The amounts are capitalized and are accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of the projects. Upon successful completion of each IPR&D project, the Company will make a determination as to the then-useful life of the intangible asset, generally determined by the period in which the substantial majority of the cash flows are expected to be generated and begin amortization. The Company evaluates IPR&D for impairment on an annual basis, during the fourth quarter, or more frequently if impairment indicators exist. The Company’s IPR&D balance was $2.0 million as of December 31, 2025, and 2024. No IPR&D impairment charges were recognized for the years ended December 31, 2025, or 2024.

As of December 31, 2025, and 2024, the Company had a definite-lived intangible asset, net related to the acquisition of OLPRUVA of $0 and $61.3 million, respectively. The Company recorded an intangible asset impairment charge in the consolidated statements of operations for the year ended December 31, 2025 as a result of a triggering event indicating the asset's carrying amount may not be recoverable (see Note S). Prior to the impairment, this asset was amortized on a straight-line basis over the OLPRUVA useful life ofthirteen years. The Company reviews the estimated useful lives of its intangible assets on an ongoing basis. Amortization expense is recorded as intangible asset amortization in the consolidated statements of operations and was $2.6 million and $5.9 million for the years ended December 31, 2025, and 2024, respectively.

In connection with the XOMA License Agreement, the Company paid XOMA a regulatory milestone payment of $6.0 million upon approval of MIPLYFFA in September 2024, which is included in intangible assets, net in the consolidated balance sheets. This definite-lived intangible asset is amortized on a straight-line basis over the MIPLYFFA patent life of approximately five years and is reviewed periodically for impairment. Amortization expense is recorded as intangible asset amortization in the consolidated statements of operations and was $1.3 million and $0.3 million for the years ended December 31, 2025 and 2024, respectively.

Property and Equipment

The Company records property and equipment at cost less accumulated depreciation and amortization. Costs of renewals and improvements that extend the useful lives of the assets are capitalized. Maintenance and repairs are expensed as incurred. Depreciation is determined on a straight-line basis over the estimated useful lives of the assets, which generally range from three toten years. Leasehold improvements are amortized over the shorter of the useful life of the asset or the term of the related lease. Upon retirement or disposition of assets, the costs and related accumulated depreciation and amortization are removed from the accounts with the resulting gains or losses, if any, reflected in the consolidated statements of operations.

Impairment of Long-Lived Assets

Long-lived assets to be held and used are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset group may not be recoverable. When such events occur, the Company compares the carrying amount of the asset group to the undiscounted expected future cash flows. If the undiscounted cash flows are insufficient to recover the carrying value, an impairment loss is recorded for the difference between the carrying value and fair value of the asset group. Beyond the definite-lived intangible asset impairment disclosed in Note S, no other impairment occurred for the years ended December 31, 2025, or 2024.

Gain on Sale of PRV

The Company received a transferable rare priority review voucher (“PRV”) in conjunction with the FDA approval of MIPLYFFA. On February 26, 2025, the Company and its subsidiary, Zevra Denmark A/S, entered into an asset purchase agreement with a buyer, pursuant to which the Company agreed to sell the PRV to the buyer for aggregate proceeds of $150.0 million, payable in cash, upon the closing of the sale. On April 1, 2025, the asset sale was consummated and title of the PRV transferred to the buyer, resulting in net proceeds of $148.3 million to the Company. The PRV did not have a carrying value at the time of sale. In accordance with ASC 610-20, Gains and Losses from the Derecognition of Nonfinancial Assets, the net proceeds from the sale were recorded as a gain on sale of PRV in the Company's consolidated statements of operations for the year ended December 31, 2025.

Revenue Recognition

The Company recognizes revenue in accordance with the provisions of ASC 606, Revenue from Contracts with Customers (“ASC 606”) and, as a result, follows the five-step model when recognizing revenue: 1) identifying a contract; 2) identifying the performance obligations; 3) determining the transaction price; 4) allocating the price to the performance obligations; and 5) recognizing revenue when the performance obligations have been fulfilled.

Product Revenues, net

Net revenues from product sales are recognized at the transaction price when the customer obtains control of the Company's product, which occurs at a point in time, typically upon receipt of the product by the customer. The Company's current single customer for product sales of MIPLYFFA and OLPRUVA is a specialty pharmacy provider.

In accordance with ASC 606, the Company recognizes revenue when fulfilling its performance obligation by transferring control of promised goods or services to its customer, in an amount that reflects the consideration that the Company expects to receive in exchange for those goods or services. In determining when the customer obtains control of the product, the Company considers certain indicators, including whether the Company has a present right to payment from the customer, whether title and/or significant risks and rewards of ownership have transferred to the customer and whether customer acceptance has been received. The Company's net revenues represent total revenues adjusted for discounts and allowances, including estimated cash discounts, chargebacks, rebates, returns, copay assistance, data fees and wholesaler fees for services. These adjustments represent variable consideration under ASC 606 and are recorded as a reduction of revenue. These adjustments are established by management as its best estimate based on available information and will be adjusted to reflect known changes in the factors that impact such allowances. Adjustments for variable consideration are determined based on the contractual terms with customers, historical trends, communications with customers and the levels of inventory remaining in the distribution channel, as well as expectations about the market for the product and anticipated introduction of competitive products. All estimated reserve liabilities related to commercial products are recorded within the current portion of discount and rebate liabilities in the consolidated balance sheets.

Expanded Access Program

Net revenue includes revenue from the sale of arimoclomol for the treatment of NPC under an expanded access program (“EAP”) in France, and in select territories outside Europe. An EAP is a program giving specific patients access to a drug that is not yet approved for commercial sale. Only drugs targeting serious or rare indications and for which there is currently no appropriate treatment are considered for expanded access programs. Further, to be considered for the expanded access program, the drug must have proven efficacy and safety and must either be undergoing price negotiations or seeking marketing approval.

In accordance with ASC 606, the Company recognizes revenue when fulfilling its performance obligation under the global EAP by transferring control of promised goods or services to its customer, in an amount that reflects the consideration that the Company expects to receive in exchange for those goods or services. In determining when the customer obtains control of the product, the Company considers certain indicators, including whether the Company has a present right to payment from the customer, whether title and/or significant risks and rewards of ownership have transferred to the customer and whether customer acceptance has been received. Revenue is recognized net of sales deductions, including discounts, rebates, applicable distributor fees, and revenue-based taxes.

The French Health Authorities and the manufacturer have agreed to a price for sales under the EAP in France, but the final price depends on the terms and conditions negotiated with the French Health Authorities, following market authorization. Any excess in the price charged by the manufacturer compared to the price agreed with the health authorities once the medicinal product is authorized in France must be repaid. The repayment is considered in the clawback liability. An estimate of net revenue and clawback liability are recognized using the ‘expected value’ method. Accounting for net revenue and clawback liability requires determination of the most appropriate method for estimating the expected final price. This estimate also requires assumptions with respect to inputs into the method, including current pricing of comparable marketed products within the rare disease area in France. Management has considered the expected final sales price as well as the price of similar medicinal products. The Company is operating within a rare disease therapeutic area where there is unmet treatment need and hence a limited number of comparable commercialized medicinal products. The limited available relevant market information for directly comparable commercialized medicines within rare disease increases the uncertainty in management's estimate.

Licensing Agreements

The terms of the Company’s licensing agreements typically include one or more of the following: (i) upfront fees; (ii) milestone payments related to the achievement of development, regulatory, or commercial goals; and (iii) royalties on net sales of licensed products. Each of these payments may result in licensing revenues.

As part of the accounting for these agreements, the Company must develop estimates and assumptions that require judgment to determine the underlying stand-alone selling price for each performance obligation, which determines how the transaction price is allocated among the performance obligations. Generally, the estimation of the stand-alone selling price may include such estimates as independent evidence of market price, forecasted revenues or costs, development timelines, discount rates, and probability of regulatory success. The Company evaluates each performance obligation to determine if it can be satisfied at a point in time or over time, and it measures the services delivered to the licensee, which are periodically reviewed based on the progress of the related program. The effect of any change made to an estimated input component and, therefore, revenue or expense recognized, would be recorded as a change in estimate. In addition, variable consideration (e.g., milestone payments) must be evaluated to determine if it is constrained and, therefore, excluded from the transaction price.

Upfront Fees: If a license to the Company’s intellectual property is determined to be distinct from the other performance obligations identified in the arrangement, the Company recognizes revenues from the transaction price allocated to the license when the license is transferred to the licensee and the licensee 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.

Milestone Payments: At the inception of each arrangement that includes milestone payments (variable consideration), the Company evaluates whether the milestones are considered probable of being reached and estimates the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within the Company’s or the licensee’s control, such as non-operational developmental and regulatory approvals, are generally not considered probable of being achieved until those approvals are received. At the end of each reporting period, the Company re-evaluates the probability of achievement of milestones that are within its or the licensee’s control, such as operational developmental milestones and any related constraint, and, if necessary, adjusts its estimate of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, which would affect collaboration revenues and earnings in the period of adjustment. Revisions to the Company’s estimate of the transaction price may also result in negative licensing revenues and earnings in the period of adjustment.

Acquired IPR&D and Milestones Expenses

In an asset acquisition, payments incurred prior to regulatory approval to acquire rights to IPR&D projects are expensed as acquired IPR&D and milestones expense in the consolidated statements of operations unless the project has an alternative future use. These costs include upfront and development milestone payments related to R&D collaborations, licensing arrangements, or other asset acquisitions that provide rights to develop, manufacture and/or sell pharmaceutical products. Where contingent development milestone payments are due to third parties, prior to regulatory approval, the payment obligations are expensed when the milestone results are achieved. Regulatory and commercial milestone payments made to third parties subsequent to regulatory approval are capitalized as intangible assets and amortized to intangible asset amortization over the remaining useful life of the related product.

Inventories

The value of inventories is recorded at net realizable value. The Company determines the cost of its inventories, which include amounts related to materials and manufacturing overhead, on a first-in, first-out basis. Inventories that are not expected to be sold within 12 months are classified as inventories, noncurrent.

The Company may scale-up and make commercial quantities of its product candidates prior to the date it anticipates that such product will receive final regulatory approval. The scale-up and commercial production of pre-launch inventory involves the risk that such products may not be approved for marketing on a timely basis, or ever. This risk notwithstanding, the Company may scale-up and build pre-launch inventory of products that have not received final regulatory approval when the Company believes such action is appropriate in relation to the commercial value of the product launch opportunity. We capitalize inventory costs associated with our products prior to regulatory approval when, based on management's judgment, future commercialization is considered probable and the future economic benefit is expected to be realized; otherwise, such costs are expensed as research and development. The determination to capitalize inventory costs is based on various factors, including status and expectations of the regulatory approval process, any known safety or efficacy concerns, potential labeling restrictions, and any other impediments to obtaining regulatory approval. The Company had no pre-approval inventory on our consolidated balance sheets as of December 31, 2025, or 2024. Inventory used in clinical trials is also expensed as research and development expense, when selected for such use. Inventory that can be used in either the production of clinical or commercial products is expensed as research and development costs when identified for use in a clinical manufacturing campaign. The cost of finished goods inventory that is shipped to a customer to support the Company’s patient assistance programs is expensed when those shipments take place. As of December 31, 2025, and 2024, the Company did not have pre-launch inventory that qualified for capitalization.

The Company performs an assessment of the recoverability of capitalized inventory during each reporting period and writes down any excess and obsolete inventory to its net realizable value in the period in which the impairment is first identified. Such impairment charges, should they occur, are recorded as a component of cost of product revenue in the consolidated statements of operations. The determination of whether inventory costs will be realizable requires the use of estimates by management. If actual market conditions are less favorable than projected by management, additional write downs of inventory may be required. Additionally, the Company’s products are subject to strict quality control and monitoring, which is performed throughout the manufacturing process. In the event that certain batches or units of product do not meet quality specifications, the Company will record a charge to cost of product revenue, to write down any unsaleable inventory to its estimated net realizable value. For the years ended December 31, 2025, and 2024, the Company recognized charges of approximately $11.7 million and $5.7 million, respectively, related to write-downs for unsaleable inventory.

Cost of Product Revenue

The components of cost of product revenue are royalties and expenses directly attributable to revenue. To date, the Company has generated revenue from product sales of MIPLYFFA and OLPRUVA, reimbursements received under the global EAP, royalties or net sales milestone payments generated under the Collaboration and License Agreement with Commave Therapeutics SA (the “AZSTARYS® License Agreement”), and consulting agreements.

Prior to our acquisition of the assets of Orphazyme A/S (“Orphazyme”) in May 2022, Orphazyme had entered into an asset purchase agreement with LadRx Corporation, which was assigned to XOMA (US) LLC, a wholly-owned subsidiary of XOMA Corporation (“XOMA”), in June 2023 (“XOMA License Agreement”). Under the XOMA License Agreement, XOMA is entitled to a mid-single digit percentage royalty with respect to net sales of MIPLYFFA as well as milestone payments based on future potential sales and regulatory milestones. On August 30, 2023, Acer and Relief Therapeutics SA (“Relief”) entered into an exclusive license agreement (the “Relief License Agreement”). Pursuant to the Relief License Agreement, Zevra was obligated to pay royalties of 10% of U.S. net sales of OLPRUVA up to a maximum of $45.0 million, plus specified regulatory milestones, for total payments to Relief of up to $56.5 million. On April 10, 2025, the rights to this royalty were sold to Soleus Capital Management L.P.

In connection with the AZSTARYS License Agreement, the Company pays Aquestive Therapeutics, Inc. (“Aquestive”) a royalty equal to 10% of all regulatory milestone and royalty payments.

Accounts and Other Receivables

Accounts and other receivables consist of receivables from MIPLYFFA and OLPRUVA product sales, receivables under the AZSTARYS License Agreement, the global EAP, and income tax receivables and other receivables due to the Company. Receivables under the AZSTARYS License Agreement are recorded for amounts due to the Company related to reimbursable third-party costs as well as milestones and royalties on product sales. Receivables under the global EAP are recorded for product sales of MIPLYFFA in France and select territories outside of Europe. The Company provides reserves against receivables for estimated losses that may result from a customer's inability to pay. Receivables are evaluated to determine if any reserve or allowance should be recorded based on consideration of the current economic environment, expectations of future economic conditions, specific circumstances and the Company’s own historical collection experience. Amounts determined to be uncollectible are charged or written-off against the reserve.

Research and Development

Major components of research and development costs include cash compensation, stock-based compensation, depreciation and amortization expense on research and development property and equipment, costs of preclinical studies, clinical trials and related clinical manufacturing, costs of drug development, costs of materials and supplies, facilities cost, overhead costs, regulatory and compliance costs, and fees paid to consultants and other entities that conduct certain research and development activities on the Company’s behalf. Costs incurred in research and development are expensed as incurred.

The Company records nonrefundable advance payments it makes for future research and development activities as prepaid expenses. Prepaid expenses are recognized as expense in the consolidated statements of operations as the Company receives the related goods or services.

The Company enters into contractual agreements with third-party vendors who provide research and development, manufacturing, and other services in the ordinary course of business. Some of these contracts are subject to milestone-based invoicing and services are completed over an extended period of time. The Company records liabilities under these contractual commitments when an obligation has been incurred. This accrual process involves reviewing open contracts and purchase orders, communicating with the applicable personnel to identify services that have been performed and estimating the level of service performed and the associated cost when the Company has not yet been invoiced or otherwise notified of actual cost. The majority of the service providers invoice the Company monthly in arrears for services performed. The Company makes estimates of the accrued expenses as of each balance sheet date based on the facts and circumstances known. The Company periodically confirms the accuracy of the estimates with the service providers and make adjustments, if necessary.

Patent Costs

Patent costs, including related legal costs, are expensed as incurred and recorded within general and administrative expenses on the consolidated statements of operations.

Income Taxes

The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax basis of assets and liabilities, as well as for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using the tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. Valuation allowances are recorded to reduce deferred tax assets to the amount the Company believes is more likely than not to be realized.

The Company is subject to taxation in the United States (including federal, state, and local jurisdictions) and the Kingdom of Denmark. Generally, the Company is subject to examination by tax jurisdictions from 2021 to 2024 tax years as the statute of limitation (excluding net operating loss carryforwards) are 3 to 4 years in the United States and Kingdom of Denmark. Tax liabilities may arise from interpretations and judgments made by the Company with regard to transfer pricing in the application of the relevant statutes, regulations, tax rulings and case law across the various jurisdictions. The Company uses significant judgment in (1) determining whether the technical merits of tax positions taken in the various jurisdictions are more-likely-than-not to be sustained based on applicable tax law and (2) measuring the related amount of tax liability that qualifies for recognition. The United States federal and state tax jurisdictions can audit the net operating loss carryforwards from the tax years in which the statute of limitation has expired but can only adjust the net operating loss carryforwards. No income tax returns are currently under examination by taxing authorities.

Uncertain tax positions are recognized only when the Company believes it is more likely than not that the tax position will be upheld on examination by the taxing authorities based on the merits of the position. The Company recognizes interest and penalties, if any, related to unrecognized income tax uncertainties in income tax expense.

On December 22, 2017, the U.S. government enacted H.R. 1, “An Act to provide for reconciliation pursuant to titles II and V of the concurrent resolution on the budget for fiscal year 2018” (“Tax Act”). Effective January 1, 2018, the Tax Act provides for a new global intangible low-taxed income (“GILTI”) provision. Under the GILTI provision, certain foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets are included in U.S. taxable income. The Company has not recorded any deferred taxes for future GILTI inclusions as any future inclusions are expected to be treated as a period expense and offset by net operating loss carryforwards in the United States.

Stock-Based Compensation

The Company measures and recognizes compensation expense for all stock-based payment awards made to employees, officers and directors based on the estimated fair values of the awards as of the grant date. The Company records the value of the portion of the award that is ultimately expected to vest as expense over the requisite service period. The Company also accounts for equity instruments issued to non-employees using a fair value approach under ASC subtopic 505-50. The Company values equity instruments and stock options granted using the Black-Scholes-Merton (“BSM”) option pricing model.

Earnings per Share

The Company uses the two-class method to compute net income (loss) per common share because the Company has issued securities, other than common stock, that contractually entitle the holders to participate in dividends and earnings of the Company. The two-class method requires earnings for the period to be allocated between common stock and participating securities based upon their respective rights to receive distributed and undistributed earnings. Holders of each series of the Company’s convertible preferred stock and select warrants are entitled to participate in distributions, when and if declared by the board of directors, that are made to common stockholders and, as a result, are considered participating securities.

Segment and Geographic Information

Operating segments are defined as components of an enterprise (business activity from which it earns revenue and incurs expenses) for which discrete financial information is available and regularly reviewed by the chief operating decision maker (“CODM”) in deciding how to allocate resources and in assessing performance. The Company’s CODM is its Chief Executive Officer. The Company views its operations and manages its business as a single operating and reporting segment. See Note C for further information.

Foreign Currency

Assets and liabilities are translated into the reporting currency using the exchange rates in effect on the balance sheet dates. Equity accounts are translated at historical rates, except for the change in retained earnings during the year, which is the result of the income statement translation process. Revenue and expense accounts are translated using the weighted average exchange rate during the period. The cumulative translation adjustments associated with the net assets of foreign subsidiaries are recorded in accumulated other comprehensive income (loss) in the accompanying consolidated statements of stockholders’ equity.

Debt Issuance Costs

Debt issuance costs incurred in connection with financing arrangements are recorded as a reduction of the related debt on the consolidated balance sheets and amortized over the life of the respective financing arrangement using the effective interest method.

The Company accounts for warrants as either equity-classified or liability-classified instruments based on an assessment of the warrant’s specific terms and applicable authoritative guidance in FASB ASC Topic 480, Distinguishing Liabilities from Equity (“ASC 480”) and FASB ASC Topic 815, Derivatives and Hedging (“ASC 815”). The assessment considers whether the warrants are freestanding financial instruments pursuant to ASC 480, meet the definition of a liability pursuant to ASC 480, and whether the warrants meet all of the requirements for equity classification under ASC 815, including whether the warrants are indexed to the Company's own stock and whether the warrant holders could potentially require “net cash settlement” in a circumstance outside of the issuing company’s control, among other conditions for equity classification. This assessment, which requires the use of professional judgment, is conducted at the time of warrant issuance and as of each subsequent quarterly period end date while the warrants are outstanding.

For warrants that meet all criteria for equity classification, the warrants are required to be recorded as a component of additional paid-in capital on the consolidated statements of changes in stockholders’ equity at the time of issuance. For warrants that do not meet all the criteria for equity classification, the warrants are required to be recorded at their initial fair value on the date of issuance, and on each balance sheet date thereafter. Changes in the estimated fair value of the warrants are recognized as a non-cash gain or loss in other expense, net, on the consolidated statements of operations. The fair value of the warrants was estimated using the BSM option pricing model.

New Accounting Pronouncements Recently Adopted

In December 2023, the FASB issued Accounting Standards Update (“ASU”) No. 2023-09, Income Taxes (“Topic 740”): Improvements to Income Tax Disclosures. ASU 2023-09 establishes new income tax disclosure requirements in addition to modifying and eliminating certain existing requirements. Under the new guidance, entities must consistently categorize and provide greater disaggregation of information in the reconciliation of the effective tax rate to the statutory tax rate and must also further disaggregate income taxes paid. The Company adopted ASU 2023-09 for the year ended December 31, 2025 using a retrospective approach and included the required disclosures in the Notes to the Consolidated Financial Statements for income taxes. This standard update did not affect the Company’s results of operations.

New Accounting Pronouncements Not Yet Adopted

In November 2024, the FASB issued ASU No. 2024-03, Income Statement: Reporting Comprehensive Income-Expense Disaggregation Disclosures (“Subtopic 220-40”): Disaggregation of Income Statement Expenses. The new standard requires disclosure of specified information about certain costs and expenses. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026 and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating this guidance to determine the impact it may have on its consolidated financial statements disclosures.

C. Segment Information

Zevra manages its business activities on a consolidated basis and operates as a single operating segment dedicated to the research and development, manufacturing, commercialization and sale of innovative medicines and therapies. The Company primarily derives its revenue from MIPLYFFA and OLPRUVA product sales, reimbursements received under the global EAP, and royalties or net sales milestone payments generated under the AZSTARYS License Agreement. The accounting policies of the segment are the same as those described in Note B.

Zevra's CODM is the Company's Chief Executive Officer, Neil F. McFarlane. The CODM uses net income (loss), as reported in the Company's consolidated statements of operations, in evaluating performance of its segment and determining how to allocate resources of the Company as a whole, including investing in its research and development, commercialization efforts, and acquisition strategy. The CODM does not review assets in evaluating the results of the segment, and, therefore, such information is not presented.

The following table presents the operating results of the Company's segment for the years ended December 31, 2025 and 2024:

(a)Other (income) expense, net included in segment net income (loss) includes the gain on the sale of the PRV in the current year, foreign currency exchange gains and losses, cost of product revenue (excluding intangible asset amortization), fair value adjustments related to warrant and contingent value right (“CVR”) liabilities, fair value adjustment related to investments, and other overhead expenses.

The Company holds long-lived assets in the United States of $2.2 million and $13.4 million as of December 31, 2025 and 2024, respectively. The Company holds long-lived assets in Europe of $0.4 million and $0.5 million as of December 31, 2025 and 2024, respectively.

D. Inventories

The components of inventory are summarized as follows (in thousands):

E. Accounts and Other Receivables

Accounts and other receivables consist of the following (in thousands):

As of December 31, 2025, and 2024, no reserve or allowance for doubtful accounts had been established.

F. Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following (in thousands):

G. Property and Equipment

Property and equipment consists of the following (in thousands):

The estimated useful lives of property and equipment are as follows:

Depreciation and amortization expense related to property and equipment was $0.2 million for both years ended December 31, 2025 and 2024.

H. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following (in thousands):

I. Debt Obligations

Secured Promissory Note

On August 30, 2023, the Company and Nantahala Capital Management, LLC (“NCM”), certain of its affiliates and certain other parties (collectively with NCM, “Nantahala”), entered into a secured promissory note payable by Zevra to Nantahala in the original principal amount of $5.0 million (the “Nantahala Note”). The Nantahala Note initially bore interest at 9.0% per annum, payable quarterly in arrears in cash. The interest rate increased to 12.0% per annum effective March 1, 2024, as the Nantahala Note remained unpaid six months from its issue date. The additional 3.0% interest would have been paid in shares of Zevra's common stock based on the volume weighted average trading price of Zevra's common stock during thetwenty consecutive trading days ending on the date before such interest payment date. Beginning on the first interest payment date following the second anniversary of the Nantahala Note, and on each interest payment date thereafter, Zevra was required to make $0.6 million amortization payments on the Nantahala Note until it was paid in full. All principal and unpaid interest on the Nantahala Note would have been due on August 30, 2026, the third anniversary of the Nantahala Note. Zevra was entitled to prepay the Nantahala Note at any time without penalty.

The Nantahala Note was secured by Zevra’s interest in Acer's assets. The Company used the proceeds from the Nantahala Note, along with $12.0 million in cash and 98,683 shares of Zevra's common stock, to acquire Acer's term loans. In April 2024, the Nantahala Note was repaid in full and terminated. At the time of repayment, Nantahala elected to receive a cash payment in lieu of shares of Zevra's common stock in exchange for the additional 3.0% interest accrued for the period from March 1, 2024 through April 5, 2024.

Margin Account

On January 26, 2023, the Company and Wells Fargo, as lender, entered into a revolving margin account agreement. The Company's investments were used as collateral for the loan and the amount the Company was able to borrow was limited to 80-90% of its outstanding investment balance held with Wells Fargo. The margin account bore interest at the Prime rate minus 225 basis-points. In April 2024, the Company repaid the outstanding balance under the margin account with Wells Fargo, and upon such repayment, the margin capabilities were removed from the account.

Term Loans

On April 5, 2024 (the “Term Loans Closing Date”), the Company entered into a credit agreement (the “Credit Agreement”) with HCR Stafford Fund II, L.P., HCR Potomac Fund II, L.P., and Perceptive Credit Holdings IV, LP (collectively, the “Lenders”), and Alter Domus (US) LLC, as administrative agent (the “Administrative Agent”).

Under the terms of the Credit Agreement, the Lenders provided a senior secured loan facility to the Company in the aggregate principal amount of $100.0 million, which is divided into three tranches as follows: (i) $60.0 million, which was funded in full on the Term Loans Closing Date; (ii) $20.0 million, which was available to the Company in up totwo drawings, each in an amount not to exceed $10.0 million, at the Company’s option until October 5, 2025; and; (iii) $20.0 million, which was available to the Company upon approval by the FDA of the NDA for MIPLYFFA for the treatment of NPC, at the Company’s option until December 31, 2024 (collectively, the “Term Loans”). The Company did not draw down the amounts described in (ii) and (iii) above prior to their applicable expiration dates.

The principal amount of the Term Loans outstanding (the “Outstanding Principal Amount”) historically bore interest at a rate equal to 3-Month Term Secured Overnight Financing Rate (“SOFR”) plus 7.00% per annum. As the net product sales for the calendar year ending December 31, 2025 exceeded $100.0 million, the Outstanding Principal Amount will bear interest at 3-Month Term SOFR plus 6.00% per annum beginning on January 1, 2026. In all cases, the 3-Month Term SOFR rate is subject to a floor of 4.00% per annum. Interest is payable quarterly in arrears on the last day of each calendar quarter. The Company has the option to pay up to 25% of the interest in-kind beginning on the Term Loans Closing Date, through and including June 30, 2026. The Company has recognized approximately $3.1 million and $1.4 million of interest-in-kind as of December 31, 2025, and 2024, which is included in long-term debt in the consolidated balance sheets. The Term Loans will mature on the fifth anniversary of the Term Loans Closing Date. In connection with the Credit Agreement, the Company incurred approximately $2.2 million of costs, which primarily consisted of underwriting, legal and other professional fees, and are included as a reduction to the carrying amount of the related debt liability and are deferred and amortized over the remaining life of the financing using the effective interest method.

The Credit Agreement contains customary affirmative and negative covenants by the Company, which, among other things, will require the Company to provide certain financial reports to the Lenders within 60 days after the end of each of the first three fiscal quarters of each fiscal year and 105 days after the end of each fiscal year, meet certain minimum net product sales amounts, meet certain minimum liquidity, and limit the ability of the Company to, among other things, incur or guarantee additional indebtedness, conduct asset sales, incur liens, make dividends or distributions, conduct transactions with affiliates, and effect a consolidation or merger without consent. The obligations of the Company under the Credit Agreement may be accelerated upon customary events of default, including non-payment of principal, interest, fees and other amounts, covenant defaults, insolvency, material judgments, or inaccuracy of representations and warranties. The Term Loans are secured by a first priority perfected lien on, and security interest in, substantially all current and future assets of the Company and certain subsidiaries of the Company that are guarantors thereunder. The proceeds of the Term Loans were used to refinance certain existing indebtedness of the Company and its subsidiaries. The Company will use the remaining proceeds to pay fees and expenses related to the debt financing and commercialization of MIPLYFFA and OLPRUVA, and to further the development of its other product candidates.

Long-term debt consisted of the following (in thousands):

Future minimum principal payments under the Term Loans as of December 31, 2025, are as follows (in thousands):

J. Revenue, net

For the years ended December 31, 2025, and 2024, the Company recorded$106.5 million and $23.6 million, respectively, of revenue. Included in revenue for the year ended December 31, 2025 is a de minimis amount related to the licensing of certain IP.

Product Revenues, net

On December 27, 2022, the FDA approved OLPRUVA (sodium phenylbutyrate), a prescription medicine used along with certain therapy, including changes in diet, for the chronic management of adults and children with certain UCDs. For the years ended December 31, 2025, and 2024, sales of OLPRUVA were $0.8 million and $0.1 million.

On September 20, 2024, the FDA approved MIPLYFFA (arimoclomol), an orally-delivered treatment for NPC, which is an ultra-rare and progressive neurodegenerative disease, for treatment in combination with miglustat. For the years ended December 31, 2025, and 2024, net sales of MIPLYFFA were $87.4 million and $10.1 million, respectively.

The Company currently utilizes a single specialty pharmacy provider as its sole distributor for both MIPLYFFA and OLPRUVA. The Company also enters into arrangements with health care providers and payors that provide for government mandated and/or privately negotiated rebates with respect to the purchase of its products. All estimated reserve liabilities related to commercial products are recorded within the current portion of discount and rebate liabilities in the consolidated balance sheets. To commercialize MIPLYFFA and OLPRUVA in the United States, the Company has built marketing, sales, medical affairs, distribution, managerial and other non-technical capabilities or has made arrangements with third parties to perform these services. All revenues derived from sales of MIPLYFFA and OLPRUVA are in the United States.

Expanded Access Program

For the years ended December 31, 2025, and 2024, the Company recognized revenue related to the global EAP of $13.0 million and $9.1 million, respectively, net of a clawback liability of $6.1 million and $5.7 million, respectively, and other gross to net adjustments.

The total estimated reserve liability as of December 31, 2025, and 2024, was $15.3 million and $12.6 million, respectively. As of December 31, 2025, and 2024, this estimated reserve liability is recorded as discount and rebate liabilities in the consolidated balance sheets and is separated into current and long-term based upon the timing of the expected payment to the French regulators.

AZSTARYS License Agreement

The Company entered into a Collaboration and License Agreement (the “AZSTARYS License Agreement”) with Commave Therapeutics SA (formerly known as Boston Pharmaceuticals Holdings SA) (“Commave”), an affiliate of Gurnet Point Capital, L.P., dated September 3, 2019. Under the AZSTARYS License Agreement, as amended, the Company granted to Commave an exclusive, worldwide license to develop, manufacture and commercialize the Company’s product candidates containing SDX and d-MPH, including AZSTARYS, or any other product candidates containing SDX and developed to treat ADHD or any other central nervous system disorder. Corium Inc. was tasked by Commave to lead all commercialization activities for AZSTARYS under the AZSTARYS License Agreement. Pursuant to the AZSTARYS License Agreement, Commave agreed to pay milestone payments up to an aggregate of $590.0 million upon the occurrence of specified regulatory milestones related to AZSTARYS, additional fixed payments upon the achievement of specified U.S. sales milestones, and quarterly, tiered royalty payments based on a range of percentages of net sales (as defined in the AZSTARYS License Agreement). Commave is obligated to make such royalty payments on a product-by-product basis until expiration of the royalty term for the applicable product.

The Company concluded that these regulatory milestones, sales milestones and royalty payments each contain a significant uncertainty associated with a future event. As such, these milestone and royalty payments are constrained at contract inception and are not included in the transaction price, as the Company could not conclude that it is probable a significant reversal in the amount of cumulative revenue recognized will not occur surrounding these milestone payments. At the end of each reporting period, the Company updates its assessment of whether the milestone and royalty payments are constrained by considering both the likelihood and magnitude of the potential revenue reversal. For the years ended December 31, 2025, and 2024, the Company recognized revenue under the AZSTARYS License Agreement of $5.0 million and $4.3 million, respectively. There wasno deferred revenue related to this agreement as of December 31, 2025, and 2024. All revenues recognized under this agreement were derived in the United States.

The AZSTARYS License Agreement is within the scope of ASC 606, as the transaction represents a contract with a customer where the participants function in a customer/vendor relationship and are not exposed equally to the risks and rewards of the activities contemplated under the AZSTARYS License Agreement.

Relief Exclusive License Agreement

Pursuant to the Relief License Agreement, Relief will hold exclusive development and commercialization rights for OLPRUVA in the EU, Liechtenstein, San Marino, Vatican City, Norway, Iceland, Principality of Monaco, Andorra, Gibraltar, Switzerland, United Kingdom, Albania, Bosnia, Kosovo, Montenegro, Serbia and North Macedonia (“Geographical Europe”). The Company has the right to receive a royalty of up to 10% of the net sales of OLPRUVA in Geographical Europe. For the years ended December 31, 2025, and 2024, the Company didnot recognize any revenue under the Relief License Agreement. There wasno deferred revenue related to this agreement as of December 31, 2025, and 2024.

K. Commitments and Contingencies

Legal Matters

From time to time, the Company is involved in various legal proceedings arising in the normal course of business. For some matters, a liability is not probable, or the amount cannot be reasonably estimated and, therefore, an accrual has not been made. However, for such matters when it is probable that the Company has incurred a liability and can reasonably estimate the amount, the Company accrues and discloses such estimates.

Litigation Related to the AZSTARYS License Agreement

In September 2024, the Company became engaged in a legal dispute regarding the AZSTARYS License Agreement. The litigation is currently in the discovery phase. The Company cannot predict with certainty the timing or ultimate outcome of this litigation or its potential impact on the Company's business, financial condition, or results of operations. At this time, the Company hasnot recorded any accrual for contingent liability associated with this matter. The AZSTARYS License Agreement remains in effect during this litigation, and both parties continue to perform their respective obligations thereunder. However, there can be no assurance that this dispute will not have an adverse impact on the Company's relationship with Commave or on the Company's business. The Company will continue to monitor developments in this matter and will assess the potential impact on the Company's financial statements in future periods. The Company expects to incur significant legal expenses in connection with this litigation, which may materially affect its results of operations in future periods.

As of December 31, 2025, and 2024, no accruals were made related to commitments and contingencies.

L. Stock and Warrants

Authorized, Issued, and Outstanding Common Shares

As of December 31, 2025, and 2024, the Company had authorized shares of common stock of 250,000,000 shares. Of the authorized shares,58,338,319 and 55,246,401 shares of common stock were issued as of December 31, 2025, and 2024, respectively, and 56,854,781 and 53,670,709 shares of common stock were outstanding as of December 31, 2025, and 2024, respectively.

As of December 31, 2025, and 2024, the Company had reserved authorized shares of common stock for future issuance as follows:

Common Stock Activity

The following table summarizes common stock activity for the years ended December 31, 2025 and 2024:

Authorized, Issued, and Outstanding Preferred Stock

As of December 31, 2025, and 2024, the Company had 10,000,000 shares of authorized, unallocated preferred stock, As of December 31, 2025, and 2024, no shares of preferred stock were designated, issued, or outstanding.

Warrants to Purchase Common Stock

The Company has issued warrants to purchase common stock to various third parties, of which 4,024,157 remain outstanding as of December 31, 2025, and are immediately exercisable. These warrants qualify as participating securities under ASC Topic 260, Earnings per Share, and are treated as such in the net income (loss) per share calculation (Note P). The Company may be required to redeem these warrants for a cash amount equal to the BSM value of the portion of the warrants to be redeemed.

While the warrants are outstanding (but unexercised), the warrant holders will participate in any dividend or other distribution of the Company’s assets to its common stockholders by way of return of capital or otherwise. As of December 31, 2025,1,459,380 of the warrants had been exercised. No warrants had been exercised as of December 31, 2024. The warrants have been evaluated to determine the appropriate accounting and classification pursuant to ASC 480 and ASC 815. Generally, freestanding warrants should be classified as (i) liabilities if the warrant terms allow settlement of the warrant exercise in cash and (ii) equity if the warrant terms only allow settlement in shares of common stock.

The Company determined that its outstanding warrants should be recorded as a liability and stated at fair value at each reporting period. Changes to the fair value of the warrant liability are recorded through the consolidated statements of operations as a fair value adjustment related to warrant and CVR liability. As of December 31, 2025, and 2024, the fair value of the liability associated with these warrants was approximately $9.6 million and $17.8 million, respectively. The fair value adjustment related to these warrants was $0.2 million of income and $1.7 million of loss for the years ended December 31, 2025, and 2024, respectively.

M. Stock-Based Compensation

In November 2014, the Board of Directors of the Company (“the Board”), and in April 2015, the Company’s stockholders, approved the Company’s 2014 Equity Incentive Plan (the “2014 Plan”), which became effective in April 2015. The 2014 Plan provides for the grant of stock options, other forms of equity compensation, and performance cash awards. In June 2021, the Company's stockholders approved an Amended and Restated 2014 Equity Incentive Plan (the “A&R 2014 Plan”), following its adoption by the Board in April 2021, which, among other things, added 4,900,000 shares to the maximum number of shares of common stock to be issued under the plan and extended the annual automatic increases (discussed further below) until January 1, 2031 and eliminated individual grant limits that applied under the 2014 Plan to awards that were intended to comply with the exemption for “performance-based compensation” under Code Section 162(m). The maximum number of shares of common stock that may be issued under the A&R 2014 Plan was 12,079,711 as of December 31, 2025. The number of shares of common stock reserved for issuance under the A&R 2014 Plan automatically increases on January 1 of each year, beginning on January 1, 2016, and ending on and including January 1, 2031, by 4% of the total number of shares of the Company’s capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by the Board. Pursuant to the terms of the A&R 2014 Plan, on January 1, 2026, the common stock reserved for issuance under the A&R 2014 Plan automatically increased by 2,274,191 shares.

During the years ended December 31, 2025, and 2024,1,193,883 and 1,177,545 stock options were exercised, respectively.

In June 2021, the Company's stockholders approved an Employee Stock Purchase Plan (the “ESPP”), following its adoption by the Board in April 2021. The maximum number of shares of common stock that may be issued under the ESPP is 1,500,000. The first offering period under the ESPP began on October 1, 2021, and the first purchase date occurred on May 31, 2022. As of December 31, 2025,488,038 shares have been issued under the ESPP.

In January 2023, the Board approved the 2023 Employment Inducement Award Plan (as amended, the “2023 Plan”). The maximum number of shares of common stock that may be issued under the 2023 Plan was 4,500,000 as of December 31, 2025.

In February 2025, the Board approved the Tenth Amended and Restated Non-Employee Director Compensation Policy (the “Non-Employee Director Compensation Policy”). The equity compensation granted pursuant to the Non-Employee Director Compensation Policy is granted under the A&R 2014 Plan.

Stock-based compensation expense recorded under the A&R 2014 Plan, ESPP and 2023 Plan is included in the following line items in the accompanying consolidated statements of operations (in thousands):

There was $0.2 million stock-based compensation expense related to performance-based awards recognized during the year ended December 31, 2025 resulting from the transition agreements entered into with certain former employees as noted below. There was $2.5 million stock-based compensation expense related to performance-based awards recognized during the year ended December 31, 2024.

As a result of transition agreements entered into with certain former employees and directors, the vesting for certain stock options, restricted stock units, and performance stock units was accelerated, resulting in a net increase in stock-based compensation expense of $1.5 million for the year ended December 31, 2025. The effects of this accelerated vesting are reflected in the table above within selling, general and administrative expenses. For the year ended December 31, 2024, similar transition agreements with certain former employees resulted in a net increase in stock-based compensation expense of $2.4 million which is reflected in the table above within research and development expenses.

Stock Option Awards

The Company estimates the fair value of stock options using the BSM option pricing model, which requires the use of subjective assumptions, including the expected term of the option, the expected stock price volatility, expected dividend yield and the risk-free interest rate for the expected term of the option. The expected term represents the period of time the stock options are expected to be outstanding. Due to the lack of sufficient historical exercise data to provide a reasonable basis upon which to otherwise estimate the expected term of the stock options, the Company uses the simplified method to estimate the expected term for its “plain vanilla” stock options. Under the simplified method, the expected term of an option is presumed to be the mid-point between the vesting date and the end of the contractual term. Some options, for example those that have exercise prices in excess of the fair value of the underlying stock, are not considered “plain vanilla” stock options. For these options, the Company uses an expected term equal to the contractual term of the option. Expected volatility is based on the Company’s historical volatility over the estimated expected term of the stock options. The Company assumes no dividend yield because dividends are not expected to be paid in the near future, which is consistent with the Company’s history of not paying dividends.

The Company recognizes compensation expense related to stock-based payment transactions upon satisfaction of the requisite service or vesting requirements. Forfeitures are estimated at the time of grant and revised based on actual forfeitures, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

Using the BSM option-pricing model, the weighted-average fair value of awards granted during the years ended December 31, 2025, and 2024, was$8.21 and $5.74 per share, respectively. The assumptions used to estimate fair value are as follows:

The activity under the A&R 2014 Plan and 2023 Plan for the year ended December 31, 2025, is summarized as follows:

Information regarding currently outstanding and exercisable options as of December 31, 2025, is as follows:

The total fair value of stock options vested during the years ended December 31, 2025 and 2024, was$7.6 millionand$8.1 million, respectively.

Unvested stock options as of December 31, 2025 and 2024, were as follows:

As of December 31, 2025, there was $9.0 million of total unrecognized compensation cost related to unvested share-based compensation arrangements granted under the A&R 2014 Plan and 2023 Plan.

Restricted stock units

The following table summarizes the restricted stock unit activity under the A&R 2014 and 2023 Plan:

As of December 31, 2025 there was $5.3 million of total unrecognized compensation cost related to restricted stock units.

N. Fair Value of Financial Instruments

The accounting standard for fair value measurements provides a framework for measuring fair value and requires disclosures regarding fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, based on the Company’s principal or, in absence of a principal, most advantageous market for the specific asset or liability.

The Company uses a three-tier fair value hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis, as well as assets and liabilities measured at fair value on a non-recurring basis, in periods subsequent to their initial measurement. The hierarchy requires the Company to use observable inputs, when available, and to minimize the use of unobservable inputs when determining fair value. The three tiers are defined as follows:

•Level 1: Observable inputs that reflect quoted market prices (unadjusted) for identical assets or liabilities in active markets;

•Level 2: Observable inputs other than quoted prices in active markets that are observable either directly or indirectly in the marketplace for identical or similar assets and liabilities; and

•Level 3: Unobservable inputs that are supported by little or no market data, which require the Company to develop its own assumptions.

The carrying amounts of certain financial instruments, including cash and cash equivalents, accounts and other receivables, and accounts payable and accrued expenses approximate their respective fair values due to the short-term nature of such instruments.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The Company evaluates its financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level in which to classify them for each reporting period. This determination requires significant judgments to be made. The following table summarizes the conclusions reached regarding fair value measurements as of December 31, 2025, and 2024 (in thousands):

The common stock warrant liabilities were recorded at fair value using the BSM option pricing model. The following assumptions were used in determining the fair value of the warrant liabilities valued using the BSM option pricing model as of December 31, 2025, and 2024:

The following table is a reconciliation for the common stock warrant liabilities measured at fair value using Level 3 unobservable inputs (in thousands):

For the year ended December 31, 2025, the changes in fair value of the warrant liabilities primarily resulted from the volatility of the Company's common stock.

Contingent Consideration

Contingent consideration liabilities relate to the Company's liabilities arising in connection with the CVRs. The contingent consideration is classified as Level 3 in the fair value hierarchy. The fair value is measured based on a Monte Carlo simulation or a scenario-based method, depending on the earn-out achievement objectives, utilizing projections about future performance. Significant inputs include volatility and projected financial information, including projections representative of a market participant's view of the expected cash payments associated with the agreed upon regulatory milestones based on probabilities of technical success, timing of the potential milestone events for the compounds, and estimated discount rates.

The following table provides a reconciliation of the beginning and ending balances related to the contingent consideration liabilities for the CVRs (dollars in thousands):

For the year ended December 31, 2025, the changes in fair value of contingent consideration primarily resulted from changes in the discount rates.

O. Income Taxes

For the tax years ended December 31, 2025 and 2024, income from continuing operations before taxes consists of the following:

Income tax expense (benefit)

Income tax expense (benefit) attributable to income from continuing operations consists of:

Rate reconciliation

Income tax expense attributable to income from continuing operations for the years ended December 31, 2025 and 2024 differed from the amounts computed by applying the statutory U.S. Federal income tax rate of 21 percent to pretax income from continuing operations as a result of the following (in thousands, except amounts pertaining to rate which are shown as a percentage):

(a)State taxes in Michigan for 2024 and in Michigan and Florida for 2025 made up the majority (greater than 50%) of the tax effect in this category.

Deferred tax asset (liabilities)

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2025 and 2024 are presented below (in thousands):

The valuation allowance for deferred tax assets as of December 31, 2025 and 2024 was $91.5 million and $146.4 million, respectively. The net change in the total valuation allowance for each of the years ended December 31, 2025 and 2024 was a decrease of $54.9 million and an increase of $11.9 million, respectively. The valuation allowance for both years was primarily related to U.S. domestic, state, and foreign net operating loss carryforwards as well as credit carryforwards that, in the judgment of management, are not more likely than not to be realized. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets depends on the generation of future taxable income during the periods in which those temporary differences are deductible.

At December 31, 2025, Zevra has $230.4 million in carryforwards for federal income tax purposes, which are available to reduce future federal taxable income. Of the total $230.4 million net operating loss carryforwards, $11.1 million, if not utilized, will begin to expire in 2029 and $219.4 million have no expiration date. The Company also has $312.2 million state net operating loss carryforwards which, if not utilized, will begin to expire in 2029.

Unrecognized tax benefits

A reconciliation of the beginning and ending amounts of total unrecognized tax benefits for the years ended December 31, 2025 and 2024 are as follows (in thousands):

Included in the balance of unrecognized tax benefits at December 31, 2025 is a potential benefit of $7.0 million that, if recognized, would affect the effective tax rate on income from continuing operations.

The Company files income tax returns in the United States for federal and various state jurisdictions. Generally, the statute of limitations for income tax examinations is 3 to 4 years. As such, the Company is no longer subject to U.S. federal and state and local income tax examinations for years prior to 2021, although carryforwards that were generated prior to 2021 may still be adjusted upon examination by the Internal Revenue Service or a state tax department. The Company's Denmark subsidiary files a Denmark income tax return. The Denmark statute of limitations is 3 years and, as such, it is no longer subject to Denmark tax examinations for years prior to 2022. The Company is not under income tax examination in any material jurisdiction to date.

Current portion of income tax payable

The current portion of income tax payable of $13.7 million includes approximately $11.1 million attributable to the recognized tax impact of the sale of the PRV, which included transfer pricing considerations. The remainder of the current portion of income tax payable consists of $2.6 million.

P. Net Income (Loss) Per Share

The two-class method requires earnings for the period to be allocated between common stock and participating securities based upon their respective rights to receive distributed and undistributed earnings. Under the two-class method, for periods with net income attributable to common stockholders, basic net income attributable to common stockholders per share of common stock is computed by dividing the net income attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Undistributed net income attributable to common stockholders is computed by subtracting from net income the portion of current period earnings that participating securities would have been entitled to receive pursuant to their dividend rights had all of the period’s earnings been distributed. No such adjustment to earnings is made during periods with a net loss as the holders of the participating securities have no obligation to fund losses. Diluted net income attributable to common stockholders per share of common stock is computed under the two-class method by using the weighted average number of shares of common stock outstanding plus the potential dilutive effects of stock options and warrants. In addition to analyzing under the two-class method, the Company analyzes the potential dilutive effect of stock options and warrants under the treasury-stock method when calculating diluted income (loss) attributable to common stockholders per share of common stock, in which it is assumed that the stock options and warrants convert into common stock at the beginning of the period or date of issuance, if the stock option or warrant was issued during the period. The Company reports the more dilutive of the approaches (two-class or treasury-stock/if-converted) as its diluted net income (loss) attributable to common stockholders per share of common stock during the period.

Diluted net loss per share of common stock is the same as basic net loss per share of common stock for the year ended December 31, 2024, because the effects of potentially dilutive items were anti-dilutive for the respective periods. The following securities, presented on a common stock equivalent basis, have been excluded from the calculation of weighted-average number of shares of common stock outstanding because their effect is anti-dilutive:

A reconciliation from net income (loss) to basic net income (loss) attributable to common stockholders per share of common stock and diluted net income (loss) attributable to common stockholders per share of common stock for the years ended December 31, 2025, and 2024, is as follows (in thousands):

Q. Leases

The Company has operating leases for office space and determines if an arrangement is a lease at contract inception. Lease assets and lease liabilities are recognized based on the present value of lease payments over the lease term at the commencement date. The Company does not separate lease and non-lease components. Leases with a term of 12 months or less at commencement are not recorded on the consolidated balance sheets. Lease expense for these arrangements is recognized on a straight-line bases over the lease term. The Company’s leases have remaining lease terms of less thanone year and up to approximately three years, and some which include options to terminate the leases withinone year.

The components of operating lease expense were as follows (in thousands):

Supplemental cash flow information related to leases was as follows (in thousands):

Supplemental balance sheet information related to operating leases was as follows (in thousands, except weighted average remaining lease term and weighted average discount rate):

Maturities on lease liabilities were as follows (in thousands):

R. Employee Benefit Plan

The Company has a 401(k) retirement plan (the “401(k) Plan”) that covers substantially all employees. The Company may provide a discretionary match with a maximum amount of 4% of the participant’s compensation, which vests immediately. The Company made matching contributions under the 401(k) Plan of approximately $0.3 millionand $0.5 million for the years ended December 31, 2025, and 2024, respectively.

The Company has a discretionary profit-sharing plan (the “Profit Sharing Plan”) that covers all employees. Employees become eligible participants in the Profit Sharing Plan once they have provided three years of service to the Company. The Company madeno contributions to the Profit Sharing Plan in 2025 or 2024.

S. Goodwill & Intangible Assets

The Company's goodwill balance was $4.7 million as of December 31, 2025, and 2024. As of December 31, 2025, and 2024, the Company completed its annual qualitative assessment under ASC 350 to determine whether the existence of events or circumstances indicated that it was more likely than not that the fair value of its reporting unit was less than its respective carrying value. The Company concluded that based on the relevant events and circumstances, it was more likely than not that the reporting unit’s fair value exceeded its related carrying value and therefore no quantitative assessment was required. No goodwill impairment charges were recorded for the years ended December 31, 2025, or 2024.

The definite-lived intangible assets that are subject to amortization have been reviewed for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. In the second quarter of 2025, the Company assessed the results of its refined commercial efforts related to OLPRUVA. This was determined to be a triggering event that could result in a decrease in future expected cash flows, and thus indicated the carrying amount of the OLPRUVA asset group may not be fully recoverable. The Company performed an undiscounted cash flow analysis over the OLPRUVA asset group and determined that the carrying value of the asset group is not recoverable. Future cash flows specific to OLPRUVA, which most significantly includes an estimate of forecasted revenues, are based on reasonable and supportable assumptions regarding the cash flows expected to result from the use of the asset and its eventual disposition. The Company then estimated the fair value of the asset group to measure the impairment loss for the period. The fair value measurement was based on Level 3 inputs including projected sales driven by market share and product sales price estimates, associated expenses, growth rates, and the discount rate used to measure the fair value of the net cash flows associated with this asset group. The Company recorded an intangible asset impairment charge of $58.7 million in the consolidated statements of operations for the year ended December 31, 2025. As of December 31, 2024, the Company had a definite-lived intangible asset, net, related to the acquisition of OLPRUVA of $61.3 million. There wasno comparable impairment in the year ended December 31, 2024.

Prior to the impairment discussed above, the OLPRUVA definite-lived intangible asset was being amortized on a straight-line basis over the OLPRUVA patent life of 13 years. Amortization expense is recorded as intangible asset amortization in the consolidated statements of operations and was $2.6 million and $5.9 million for the years ended December 31, 2025, and 2024, respectively.

In connection with the XOMA License Agreement, a regulatory milestone payment of $6.0 million was due to XOMA upon approval of MIPLYFFA in the United States, which the Company paid in October 2024. This definite-lived intangible asset is amortized on a straight-line basis over the MIPLYFFA patent life of approximately five years and is reviewed periodically for impairment. Amortization expense is recorded as intangible asset amortization in the consolidated statements of operations and was $1.3 million and $0.3 million for the years ended December 31, 2025, and 2024, respectively.

For intangible assets subject to amortization, estimated amortization expense for the five fiscal years subsequent to December 31, 2025, is expected to be as follows:

As of December 31, 2025, and 2024, non-amortizable intangible assets include in-process research and development of $2.0 million.

T. Subsequent Events

The Company evaluated events and transactions occurring subsequent to December 31, 2025, through March 9, 2026, the date the accompanying financial statements were issued.

During this period, there were no subsequent events that required recognition in the accompanying consolidated financial statements, nor were there any additional non-recognized subsequent events that required disclosure.

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