INOVIO PHARMACEUTICALS, INC.

1. The Company

Inovio Pharmaceuticals, Inc. (the “Company” or “INOVIO”) is a clinical-stage biotechnology company focused on developing and commercializing DNA medicines to help treat and protect people from HPV-associated diseases, cancer and infectious diseases. INOVIO's platform harnesses the power of in vivo protein production, featuring optimized design and delivery of DNA medicines that teach the body to manufacture its own disease-fighting tools.

INOVIO uses proprietary technology to design DNA plasmids, which are small circular DNA molecules that work like software the body’s cells can download to produce specific proteins to target and fight disease. The Company's proprietary investigational CELLECTRA devices are designed to deliver the plasmids into the body's cells for optimal effect, without the use of chemical adjuvants, lipid nanoparticles or viral vectors.

INOVIO's lead candidate is INO-3107 for the treatment of recurrent respiratory papillomatosis (RRP), a chronic, rare and debilitating disease of the respiratory tract caused by HPV infection. In its completed Phase 1/2 clinical trial of INO-3107 for the treatment of HPV-6 and HPV-11-associated RRP, 81.3% of patients experienced a reduction in the number of surgical interventions in the year following administration of INO-3107, when compared with the year prior to treatment.

In addition to its development efforts with INO-3107, INOVIO is actively developing or planning to develop DNA medicines for other indications, including HPV-related oropharyngeal squamous cell carcinoma (OPSCC) and anal dysplasia; glioblastoma multiforme (GBM), a deadly form of brain cancer; and a potential vaccine booster to protect against the Ebola virus. The Company was previously conducting clinical trials of a DNA medicine candidate for the treatment of HPV-related cervical high-grade squamous intraepithelial lesions (HSIL) but announced in 2023 that it was ceasing development for this indication in the United States. However, its collaborator ApolloBio Corporation continues to conduct a Phase 3 clinical trial of this candidate in China and plans to seek regulatory approval for and potentially commercialize the candidate in that jurisdiction.

The Company's partners and collaborators include Advaccine Biopharmaceuticals Suzhou Co, ApolloBio Corporation, AstraZeneca, Coherus Biosciences, Defense Advanced Research Projects Agency (DARPA), HIV Vaccines Trial Network, International Vaccine Institute (IVI), Kaneka Eurogentec, National Cancer Institute (NCI), National Institutes of Health (NIH), National Institute of Allergy and Infectious Diseases (NIAID), Plumbline Life Sciences, Regeneron Pharmaceuticals, Richter BioLogics, the University of Pennsylvania, the Walter Reed Army Institute of Research, and The Wistar Institute.

INOVIO was incorporated in Delaware in June 2001 and has its principal executive offices in Plymouth Meeting, Pennsylvania.

2. Summary of Significant Accounting Policies

Basis of Presentation and Liquidity

The Company incurred a net loss of $107.3 million for the year ended December 31, 2024. The Company had working capital of $62.5 million and an accumulated deficit of $1.7 billion as of December 31, 2024. The Company has incurred losses in each year since its inception and expects to continue to incur significant expenses and operating losses for the foreseeable future in connection with the research and preclinical and clinical development of its product candidates. The Company’s cash, cash equivalents and short-term investments of $94.1 million as of December 31, 2024 are not sufficient to support the Company's operations for a period of at least 12 months from the date it is issuing these financial statements.

On December 16, 2024, the Company closed an underwritten public offering (the "December 2024 Offering"), relating to the issuance and sale of 10,000,000 shares of its common stock, par value $0.001 per share, and warrants to purchase 10,000,000 shares of common stock (the “Warrants”), at an offering price of $3.00 per share and accompanying Warrant. The exercise price of the Warrants is $3.76 per share. The net proceeds from the December 2024 Offering were $27.6 million, after deducting the underwriting discounts and commissions and offering expenses paid by the Company.

On April 18, 2024, the Company closed an underwritten registered direct offering (the “April 2024 Offering”), relating to the issuance and sale of 2,536,258 shares (the “Shares”) of its common stock, par value $0.001 per share, at a price of $7.693 per share and pre-funded warrants to purchase up to 2,135,477 shares of common stock (the “Pre-Funded Warrants”) at a price of $7.692 per Pre-Funded Warrant, which represents the per share price for the Shares less the $0.001 per share exercise price for each Pre-Funded Warrant. The net proceeds from the April 2024 Offering were $33.2 million, after deducting the underwriting discounts and commissions and offering expenses paid by the Company.

Going Concern

The Company’s cash, cash equivalents and short-term investments of $94.1 million as of December 31, 2024 are expected to be sufficient to support the Company's planned operations through the fourth quarter of 2025. The Company's current financial resources may not be sufficient to support its planned operations beyond this date without securing additional financing.

In order to continue to fund future research and development activities, the Company will need to seek additional capital. This may occur through strategic alliance and licensing arrangements, grant agreements and/or future public or private debt or equity financings, including under At-the-Market Equity Offering Sales Agreements (“Sales Agreements”). The Company has a history of conducting debt and equity financings, including the receipt of net proceeds of $60.8 million from equity offerings during the year ending December 31, 2024, and $6.1 million and $5.5 million from equity offerings under Sales Agreements during the years ending December 31, 2024 and 2023, respectively. However, sufficient funding may not be available in the future, or if available, may be on terms that significantly dilute or otherwise adversely affect the rights of existing stockholders. If adequate funds are not available, the Company may need to delay, reduce the scope of or put on hold one or more of its clinical and/or preclinical programs.

The Company’s ability to continue its operations is dependent upon its ability to obtain additional capital in the future and achieve profitable operations. The Company expects to continue to rely on outside sources of financing to meet its capital needs and may never achieve positive cash flow. In light of these factors, management believes that there is substantial doubt about the Company's ability to continue as a going concern beyond the fourth quarter of 2025. The Company's consolidated financial statements as of and for the year ended December 31, 2024 do not include any adjustments that might result from the outcome of this uncertainty. The Company has evaluated subsequent events after the balance sheet date through the date it issued these consolidated financial statements.

The Company is, and from time to time in the future may be, subject to various legal proceedings and claims arising in the ordinary course of business. The Company assesses contingencies to determine the degree of probability and range of possible loss for potential accrual in its consolidated financial statements. An estimated loss contingency is accrued in the consolidated financial statements if it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Legal proceedings, including litigation, government investigations and enforcement actions, could result in material costs, occupy significant management resources and entail civil and criminal penalties, even if the Company ultimately prevails. Any of the foregoing consequences could result in serious harm to the Company’s business, results of operations and financial condition.

Reverse Stock Split

On January 24, 2024, the Company filed with the Secretary of State of the State of Delaware a certificate of amendment to its certificate of incorporation, as previously amended, to effect a 1-for-12 reverse stock split of its common stock (the “Reverse Stock Split”). As a result of the Reverse Stock Split, every 12 issued and outstanding shares of the Company's common stock were automatically combined into one issued and outstanding share of common stock. The reverse stock split was reflected on the Nasdaq Capital Market beginning with the opening of trading on January 25, 2024. Accordingly, an amount equal to the par value of the decreased shares resulting from the reverse stock split was reclassified from "Additional paid-in capital" to "Common stock" on the balance sheet and statement of changes in stockholders’ equity. Any fractional post-split shares as a result of the reverse stock split were eliminated by the payment of cash for the value of such fractional share. As a result of the Reverse Stock Split, proportionate adjustments were made to the number of shares underlying, and the exercise or conversion prices of, the Company's outstanding stock options and outstanding shares of Series C Cumulative Convertible Preferred Stock and to the number of shares of common stock issuable under the Company's equity incentive plans. The reverse stock split did not change the par value of the Company's common stock or the authorized number of shares of the Company's common stock.

Consolidation

The consolidated financial statements include the accounts of Inovio Pharmaceuticals, Inc. and its wholly-owned subsidiary Inovio Asia LLC.

Segment Reporting

Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision-maker ("CODM"), the President and Chief Executive Officer, in making decisions regarding resource allocation and assessing performance. The Company views its operations and manages its business asone segment operating primarily within the United States, as further described in Note 16.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, 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. Actual results could differ from those estimates.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and short-term investments. The Company limits its exposure to credit loss by placing its cash and investments with high credit quality financial institutions. Additionally, the Company has established guidelines regarding diversification of its investments and their maturities which are designed to maintain principal and maximize liquidity.

The Company has contracts with certain of its customers that have represented more than 10% of the Company's total revenues, as discussed in Note 3.

Fair Value Measurements

The guidance regarding fair value measurements establishes a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets that are accessible at the measurement date; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The Company’s financial instruments include cash equivalents, short-term investments, investments in affiliated entity, accounts receivable, prepaid expenses and other assets, accounts payable and accrued expenses and common stock warrant liability. The carrying amounts of cash equivalents, accounts receivable, prepaid expenses and other assets, accounts payable and accrued expenses approximate the related fair values due to the short-term maturities of these instruments. Short-term investments are recorded at fair value on a recurring basis, based on current market valuations. The estimated fair value of the common stock warrant liability is determined by using the Black-Scholes pricing model, as discussed in Note 5.

Cash and Cash Equivalents

Cash equivalents are considered by the Company to be highly liquid investments purchased with original maturities of three months or less from the date of purchase. Cash and cash equivalents included certain mutual funds and U.S. treasury securities at December 31, 2024 and 2023.

Short-term Investments

The Company defines investments as income-yielding securities that can be readily converted into cash or equity investments classified as available-for-sale. Investments included mutual funds, U.S. treasury securities, certificates of deposit, U.S. agency mortgage-backed securities and an equity investment in the Company’s affiliated entity, PLS, at December 31, 2024 and 2023.

Short-term investments are recorded at fair value, based on current market valuations. Unrealized gains and losses on the Company's short-term debt securities are excluded from earnings and reported as a separate component of other comprehensive loss until realized. Realized gains and losses and unrealized gains and losses on available-for-sale equity securities are included in non-operating other income (expense) on the consolidated statements of operations and are derived using the specific identification method for determining the cost of the securities sold.

Accounts Receivable from Affiliated Entities

Accounts receivable from affiliated entities are recorded at invoiced amounts and do not bear interest. The Company performs ongoing credit evaluations of its customers’ financial condition. Credit is extended to customers as deemed necessary and generally does not require collateral. Management believes that the risk of loss is significantly reduced due to the quality and financial position of the Company's customers. There wasno allowance for doubtful accounts for potential credit losses as of December 31, 2024 or 2023.

Fixed Assets

Fixed assets include property and equipment and leasehold improvements. Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful life of the assets, generally three tofive years. Leasehold improvements are amortized over the shorter of the remaining term of the related leases or the estimated economic useful lives of the improvements. Repairs and maintenance are expensed as incurred.

The Company evaluates the carrying value of long-lived assets, which includes fixed assets and right-of-use assets, for impairment whenever events or changes in circumstances indicate that the carrying amounts of the asset may not be fully recoverable. No impairment losses have been recognized related to long-lived assets for the years ended December 31, 2024 or 2023.

Warrants

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 Accounting Standards Codification (“ASC”) 480, Distinguishing Liabilities from Equity (“ASC 480”) and ASC 815, Derivatives and Hedging (“ASC 815”). This assessment, which requires the use of professional judgment, is conducted at the time of warrant issuance and as of each subsequent reporting period while the warrants are outstanding. The Pre-Funded Warrants issued in April 2024 met all the criteria for equity classification and were recorded as a component of additional paid-in capital on issuance. However, the Warrants issued in December 2024 did not meet all the criteria for equity classification and were recorded as a liability at fair value upon issuance. The Warrants met the definition of a derivative and did not meet any scope exceptions under ASC 815. As a result, the fair value of the liability associated with the Warrants will be remeasured at the end of each reporting period while the Warrants are outstanding, and any change in fair value between reporting periods will be recognized as gain or loss on the consolidated statement of operations for that reporting period.

Transaction costs associated with the issuance of the Warrants classified as a liability were expensed at the time of issuance and have been included as part of other expense, net, on the consolidated statement of operations for the year ended December 31, 2024.

Income Taxes

The Company recognizes deferred tax assets and liabilities for temporary differences between the financial reporting basis and the tax basis of the Company’s assets and liabilities along with net operating loss and tax credit carryforwards. The Company records a valuation allowance against its deferred tax assets to reduce the net carrying value to an amount that it believes is more likely than not to be realized. When the Company establishes or reduces the valuation allowance against its deferred tax assets, its provision for income taxes will increase or decrease, respectively, in the period such determination is made.

Valuation allowances against the Company’s deferred tax assets were $349.2 million and $327.5 million at December 31, 2024 and 2023, respectively. Changes in the valuation allowances, when they are recognized in the provision for income taxes, are included as a component of the estimated annual effective tax rate.

Collaboration Agreements and Revenue Recognition

The Company assesses whether its collaboration agreements are subject to Accounting Standards Codification ("ASC") Topic 808: Collaborative Arrangements (“Topic 808”) based on whether they involve joint operating activities and whether both parties have active participation in the arrangement and are exposed to significant risks and rewards. To the extent that the arrangement falls within the scope of Topic 808 and the Company concludes that its collaboration partner is not a customer, the Company presents such payments as a reduction of research and development expense. If payments from the collaboration partner to the Company represent consideration from a customer, then the Company accounts for those payments within the scope of Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (“Topic 606”).

Grants

The Company accounts for various grant agreements under the contributions guidance under Subtopic 958-605, Not-for-Profit Entities-Revenue Recognition, which is outside the scope of Topic 606, as the government agencies granting the Company funds are not receiving reciprocal value for their contributions. All contributions received from current grant agreements are recorded as a contra-research and development expense as opposed to revenue on the consolidated statement of operations.

Equity Investments

Under ASC Topic 321, Investments - Equity Securities, the Company must measure equity investments (except those accounted for under the equity method, those that result in consolidation of the investee and certain other investments) at fair value and recognize any changes in fair value in the consolidated statement of operations. The Company can elect a measurement alternative for equity investments that do not have readily determinable fair values and do not qualify for the practical expedient in ASC Topic 820, Fair Value Measurement, to estimate fair value using the net asset value per share (or its equivalent). The Company's equity investments that do not have readily determinable fair values and do not qualify for the net asset value practical expedient for estimating fair value are measured at cost, less any impairments, plus or minus changes resulting from observable price changes in orderly transactions for identifiable or similar investments of the same issuer.

Research and Development Expenses - Clinical Trial Accruals

The Company's activities have largely consisted of research and development efforts related to developing its proprietary device technology and DNA medicine candidates. For clinical trial expenses, judgements used in estimating accruals rely on estimates of total costs incurred based on participant enrollment, completion of studies and other events. Accrued clinical trial costs are subject to revisions as trials progress. Revisions are charged to expense in the period in which the facts that give rise to the revision become known. Historically, revisions have not resulted in material changes to research and development expense; however, a modification in the protocol of a clinical trial or cancellation of a trial could result in a charge to the Company's results of operations.

Net Loss Per Share

Basic net loss per share is computed by dividing the net loss for the year by the weighted average number of shares of common stock outstanding during the year. The outstanding Pre-Funded Warrants (see Note 10) are included in the weighted-average common shares outstanding in the basic net loss per share calculation for the year ended December 31, 2024 given their nominal exercise price.

Diluted net loss per share is calculated in accordance with the treasury stock method for the outstanding Warrants, stock options and restricted stock units ("RSUs") and reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted to common stock. The dilutive impact of the Notes previously issued by the Company (discussed in Note 9) was considered using the "if-converted" method. The calculation of diluted net loss per share requires that, to the extent the average market price of the underlying shares for the reporting period exceeds the exercise price of the options or other securities and the presumed exercise of such securities are dilutive to net loss per share for the period, an adjustment to net loss used in the calculation is required to remove the change in fair value of such securities from the numerator for the period. Likewise, an adjustment to the denominator is required to reflect the related dilutive shares, if any. For the years ended December 31, 2024 and 2023, basic and diluted net loss per share are the same, as the assumed exercise or settlement of common stock warrants, stock options, service-based RSUs, performance-and market-based RSUs and the potentially dilutive shares issuable upon conversion of the Notes prior to their repayment on March 1, 2024 would have been anti-dilutive.

Basic and diluted net loss per share for the year ended December 31, 2024 and 2023 are calculated as follows:

The following table summarizes potential shares of common stock that were excluded from diluted net loss per share calculation because of their anti-dilutive effect:

Leases

For its long-term operating leases, the Company recognized an operating lease right-of-use asset and an operating lease liability on its consolidated balance sheets. The lease liability is determined as the present value of future lease payments using an estimated rate of interest that the Company would pay to borrow equivalent funds on a collateralized basis at the lease commencement date. The right-of-use asset is based on the liability adjusted for any prepaid or deferred rent. The Company determines the lease term at the commencement date by considering whether renewal options and termination options are reasonably assured of exercise.

Fixed rent expense for the Company's operating leases is recognized on a straight-line basis over the term of the lease and is included in operating expenses on the consolidated statements of operations. Variable lease payments including lease operating expenses are recorded as incurred.

Stock-Based Compensation

The Company incurs stock-based compensation expense related to service-based RSUs, performance-and market-based RSUs and stock options. The fair value of restricted stock is determined by the closing price of the Company's common stock reported on the Nasdaq Capital Market on the date of grant. The Company estimates the fair value of stock options granted using the Black-Scholes option pricing model. The Black-Scholes option pricing model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of subjective assumptions, including the expected stock price volatility and expected option life. The Company amortizes the fair value of the awards on a straight-line basis over the requisite vesting period of the awards. Expected volatility is based on historical volatility. The expected life of options granted is based on historical expected life. The risk-free interest rate is based on the U.S. Treasury yield in effect at the time of grant. The dividend yield is based on the fact that no dividends have been paid historically and none are currently expected to be paid in the foreseeable future. The Company recognizes forfeitures as they occur.

The weighted average assumptions used in the Black-Scholes model for option grants to employees and directors are presented below:

The weighted average assumptions used in the Black-Scholes model for option grants to non-employees are presented below:

Recent Accounting Pronouncements

The recent accounting pronouncements below may have a significant effect on the Company's financial statements. Recent accounting pronouncements that are not anticipated to have an impact on or are unrelated to the Company's financial condition, results of operations, or related disclosures are not discussed.

ASU No. 2023-07. In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. The ASU expands public entities’ segment disclosures by requiring disclosure of significant segment expenses that are regularly reviewed by the Chief Operating Decision Maker (CODM) and included within each reported measure of segment profit or loss, an amount and description of its composition for other segment items, and interim disclosures of a reportable segment’s profit or loss and assets. The ASU also allows, in addition to the measure that is most consistent with U.S. GAAP, the disclosure of additional measures of segment profit or loss that are used by the CODM in assessing segment performance and deciding how to allocate resources. All disclosure requirements under ASU 2023-07 are also required for public entities with a single reportable segment. The ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, on a retrospective basis, with early adoption permitted. The Company has adopted ASU 2023-07 and included the segment disclosures in Note 16 below.

ASU No. 2023-09. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. ASU 2023-09 requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as information on income taxes paid. ASU 2023-09 is effective for public entities with annual periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact of this guidance its consolidated financial statements.

ASU No. 2024-03. In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. ASU

2024-03 requires public business entities to disaggregate operating expenses into specific categories such as employee compensation, depreciation, and intangible asset amortization, by relevant expense caption on the statement of operations. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027, and may be applied either prospectively or retrospectively. Early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements.

3. Revenue Recognition and Concentration of Credit Risk

During the years ended December 31, 2024 and 2023, the Company recognized revenue from various license and other agreements. The following table indicates the percentage of total revenues in excess of 10% with any single customer:

No revenue recognized during the years ended December 31, 2024 and 2023 was in deferred revenue as of December 31, 2023 and 2022, respectively.

As of December 31, 2024 and 2023, the Company had no accounts receivable balance.

4. Collaborative Agreements

Advaccine Biopharmaceuticals Suzhou Co., Ltd.

In 2020, the Company entered into a Collaboration and License Agreement with Advaccine Biopharmaceuticals Suzhou Co., Ltd. (“Advaccine”), which was amended and restated in 2021 (as amended and restated, the “Advaccine Agreement”). Under the terms of the Advaccine Agreement, the Company granted to Advaccine the exclusive right to develop, manufacture and commercialize the Company’s vaccine candidate INO-4800 within the territories of China, Taiwan, Hong Kong and Macau (referred to collectively as “Greater China”) and 33 additional countries in Asia. The 2021 amendment related to a collaboration between the Company and Advaccine to jointly conduct a global Phase 3 segment of the Company’s clinical trial of INO-4800 that was planned. The parties were jointly participating in the trial and were to equally share the global development costs for the trial, including the Company’s manufacturing costs to supply INO-4800. Advaccine agreed to be fully responsible for conducting the trial in Greater China, including its costs and expenses incurred. The Company has discontinued its internally funded efforts to develop INO-4800 as a COVID-19 heterologous booster vaccine. Advaccine continues to develop INO-4800 with its own resources under the terms of the Advaccine Agreement.

In connection with the 2021 amendment, the Company determined that the global Phase 3 trial component of the agreement was a collaboration and not a contract with a customer and therefore accounts for the 2021 amendment under ASC Topic 808. Reimbursements from Advaccine are recognized as contra-research development expense on the consolidated statement of operations once earned and collectibility is assured. During the years ended December 31,2024 and 2023, the Company received funding of $0 and $3.6 million respectively, from Advaccine that was recorded as contra-research and development expense.

ApolloBio Corporation

In 2017, the Company entered into an Amended and Restated License and Collaboration Agreement (the "ApolloBio Agreement"), with ApolloBio Corporation ("ApolloBio"), which was amended in June 2023. Under the terms of the ApolloBio Agreement, the Company granted to ApolloBio the exclusive right to develop and commercialize VGX-3100, its DNA immunotherapy product candidate designed to treat pre-cancers caused by HPV, within the agreed upon territories.

The Company is entitled to receive up to an aggregate of $20.0 million, less required income, withholding or other taxes, upon the achievement of specified milestones related to the regulatory approval of VGX-3100 in accordance with the ApolloBio Agreement. In the event that VGX-3100 is approved for marketing, the Company will be entitled to receive royalty payments based on a tiered percentage of annual net sales, with such percentage being in the low- to mid-teens, subject to reduction in the event of generic competition in a particular territory. ApolloBio’s obligation to pay royalties will continue for 10 years after the first commercial sale in a particular territory or, if later, until the expiration of the last-to-expire patent covering the licensed products in the specified territory.

During the years ended December 31, 2024 and 2023, the Company received $218,000 and $245,000, respectively, from the ApolloBio Agreement that was recorded as revenue.

Coalition for Epidemic Preparedness Innovations (CEPI)

The Company previously entered into agreements with CEPI pursuant to which the Company intended to develop vaccine candidates against Lassa fever and MERS. As part of the arrangement between the parties, CEPI agreed to fund up to an aggregate of $56 million of costs over afive-year period for preclinical studies, as well as planned Phase 1 and Phase 2 clinical trials, to be conducted by the Company and collaborators, with funding from CEPI based on the achievement of identified milestones. In 2022, the Company announced that it and CEPI would discontinue the development of these product candidates targeting Lassa fever and MERS, following the initial analysis of data from the studies conducted by the Company and funded by CEPI.

During the year ended December 31, 2024, the Company received funding of $1.6 million in connection with the final close-out of these grants, which was recorded as contra-research and development expense. During the year ended December 31, 2023, the Company received funding of $1.8 million in connection with these grants.

Bill & Melinda Gates Foundation

In 2018, Gates awarded and funded the Company a grant of $2.2 million to advance the development of dMAbs to address issues in infectious disease prevention and therapy. This technology has high relevance for the control of influenza and HIV. This next-generation approach to the delivery of monoclonal antibodies would make the technology accessible to low and middle-income countries. In 2019, Gates funded an additional $1.1 million for the project. During the years ended December 31, 2024 and 2023, the Company recorded $39,000 and $70,000, respectively, as contra-research and development expense related to the Gates dMAb grant.

5. Short-term Investments and Fair Value Measurements

The following is a summary of available-for-sale securities as of December 31, 2024 and 2023:

*No single maturity date.

During the years ended December 31, 2024 and 2023, the Company recorded gross realized gain on investments of $900 and $1,000, respectively, and gross realized loss on investments of $1.9 million and $4.8 million, respectively. During the years ended December 31, 2024 and 2023, the Company recorded net unrealized gain on available-for-sale equity securities of $2.1 million and $5.9 million, respectively. No material balances were reclassified out of accumulated other comprehensive loss for the years ended December 31, 2024 and 2023. Interest and dividends on investments classified as available-for-sale are included in interest income in the consolidated statements of operations. As of December 31, 2024, the Company had 19 available-for-sale securities with an aggregate total unrealized loss of $1.9 million. All of the securities had been in a loss position for longer than 12 months as of December 31, 2024.

The Company periodically reviews its portfolio of available-for-sale debt securities to determine if any investment is impaired due to credit loss or other potential valuation concerns. For the debt securities where the fair value of the investment is less than the amortized cost basis, the Company has assessed at the individual security level for various quantitative factors including, but not limited to, the nature of the investments, changes in credit ratings, interest rate fluctuations, industry analyst reports, and the severity of impairment. Unrealized losses on available-for-sale debt securities as of December 31, 2024 were primarily due to changes in interest rates, and not due to increased credit risks associated with specific securities. Based on the credit quality of the available-for-sale debt securities that are in an unrealized loss position, and the Company’s estimates of future cash flows to be collected from those securities, the Company believes the unrealized losses are not credit losses. Accordingly, at December 31, 2024, the Company did not record an allowance for credit losses related to its available-for-sale debt securities.

The following table presents the Company’s assets and liabilities that were measured at fair value on a recurring basis, determined using the following inputs as of December 31, 2024:

The following table presents the Company’s assets that were measured at fair value on a recurring basis, determined using the following inputs as of December 31, 2023:

Level 1 assets at December 31, 2024 consisted of mutual funds and the Company’s investment in its affiliated entity, PLS. Level 1 assets at December 31, 2023 consisted of mutual funds and U.S. treasury securities held by the Company that are valued at quoted market prices, as well as the Company’s investment in its affiliated entity, PLS. The Company accounts for its investment in 597,808 common shares of PLS based on the closing price of the shares on the Korea New Exchange Market on the applicable balance sheet date. Unrealized gains and losses on the Company's equity securities are reported in the consolidated statement of operations as unrealized gain or loss on available-for-sale equity securitiesor as a gain or loss on investment in affiliated entity.

Level 2 assets at December 31, 2024 and 2023 consisted of certificates of deposit and U.S. agency mortgage-backed securities held by the Company that are initially valued at the transaction price and subsequently valued, at the end of each reporting period, typically utilizing market observable data. The Company obtains the fair value of its Level 2 assets from a professional pricing service, which may use quoted market prices for identical or comparable instruments, or inputs other than quoted prices that are observable either directly or indirectly. The professional pricing service gathers quoted market prices and observable inputs from a variety of industry data providers. The valuation techniques used to measure the fair value of the Company's Level 2 financial instruments were derived from non-binding market consensus prices that are corroborated by observable market data, quoted market prices for similar instruments, or pricing models such as discounted cash flow techniques. The Company validates the quoted market prices provided by the primary pricing service by comparing the service's assessment of the fair values of the Company's investment portfolio balance against the fair values of the Company's investment portfolio balance obtained from an independent source.

There were no Level 3 assets held as of December 31, 2024 or 2023.

Level 3 liabilities held as of December 31, 2024 consisted of liabilities associated with the Warrants to purchase common stock issued in the Company's underwritten public offering that closed in December 2024. See Note 10 for additional information about the liability-classified warrants.

The Company reassesses the fair value of the common stock warrant liability at each reporting date utilizing a Black-Scholes pricing model. The following assumptions were used to estimate the fair value of the warrant liability:

Changes in these assumptions as well as fluctuations in the Company's stock price between the valuation dates can have a

significant impact on the fair value of the common stock warrant liability. Expected volatility was based on historical volatility. Historical volatility was computed using daily pricing observations for recent periods. The Company believes this method produced an estimate that was representative of the Company’s expectations of future volatility over the expected term. Expected term is calculated based on the remaining contractual term of the Warrants. The risk-free rate was based on the U.S. Treasury rate that corresponds to the expected term of the Warrants. As a result of these calculations, the Company recorded a decrease in fair value of the liability of $2.8 million on the consolidated statement of operations for the year ended December 31, 2024.

The following table presents the changes in fair value of the Company’s total Level 3 financial liabilities for the year ended December 31, 2024:

6. Certain Balance Sheet Items

Prepaid and other current assets at December 31, 2024 and 2023 consisted of the following:

Accounts payable and accrued expenses at December 31, 2024 and 2023 consisted of the following:

(a)As of December 31, 2024 and 2023, balance included $0 and $1.5 million, respectively, of prepaid manufacturing expenses.

(b)As of December 31, 2024 and 2023, balance included $0 and $4.3 million, respectively, of liability for unused grant funding.

7. Fixed Assets

Fixed assets at December 31, 2024 and 2023 consisted of the following:

Depreciation expense for the years ended December 31, 2024 and 2023 was $1.8 million and $2.6 million, respectively. The Company determined that the carrying value of its fixed assets was not impaired during the periods presented. During the year ended December 31, 2024, the Company sold fixed assets with no net book value for a gain of $59,000 and disposed of fixed assets with a net book value of $37,000. During the year ended December 31, 2023, the Company sold fixed assets with no net book value for a gain of $148,000 and disposed of fixed assets with a net book value of $466,000.

8. Goodwill and Intangible Assets

During 2023, as a result of the sustained decline in the Company’s stock price and related market capitalization, and a general decline in equity values in the biotechnology industry, the Company performed a quantitative impairment assessment of its goodwill and long-lived assets. The goodwill was determined to be fully impaired as of September 30, 2023, and the Company recorded an impairment charge of $10.5 million.

During 2023, the Company also recorded an impairment charge of $2.0 million to research and development expense for the remaining book value of intangible assets acquired in 2016 from Bioject Medical Technologies, as the Company had no plans to further develop or utilize this technology.

9. Convertible Debt

Convertible Senior Notes

In 2019, the Company completed a private placement of $78.5 million aggregate principal amount of its 6.50% convertible senior notes due 2024 (the “Notes”). The Notes were sold in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended. Net proceeds from the offering were $75.7 million.

The Notes were senior unsecured obligations of the Company and accrued interest payable in cash semi-annually in arrears on March 1 and September 1 of each year at a rate of 6.50% per annum. The Notes matured on March 1, 2024 and the Company paid the then remaining $16.9 million obligation in full, including accrued interest.

For the years ended December 31, 2024 and 2023, the Company recognized $178,000 and $1.2 million, respectively, of interest expense related to the Notes, of which $178,000 and $1.1 million, respectively, related to the contractual interest coupon.

10. Stockholders’ Equity

Preferred Stock

The holder of a share or shares of Series C preferred stock has the right at any time, at such holder’s option, to convert all or any lesser portion of such holder’s shares of the preferred stock into fully paid and non-assessable shares of common stock. As of December 31, 2024, the conversion value was $326.40 per share, such that the outstanding shares of Series C preferred stock were convertible into an aggregate of 275 shares of common stock.

Offerings of Common Stock and Warrants

On December 16, 2024, the Company closed the December 2024 Offering (see “Basis of Presentation and Liquidity” in Note 2 above).

Each Warrant issued in the December 2024 Offering has an initial exercise price per share of $3.76, subject to certain adjustments. The Warrants may be exercised at any time, in whole or in part, until expiration on December 16, 2029. In the event there is no effective registration statement covering the shares of common stock underlying a Warrant exercise, the Warrants may be exercised via cashless exercise. A holder (together with its affiliates and other attribution parties) may not exercise any portion of a Warrant to the extent that immediately prior to or after giving effect to such exercise the holder would own more than 4.99% (or, for certain holders who so elected prior to the issuance of the Warrants,9.99%) of the Company’s outstanding Common Stock immediately after exercise, which percentage may be changed at the holder’s election to a lower or higher percentage not in excess of 19.99% upon 61 days’ notice to the Company subject to the terms of the Warrants.

As the Warrants are not indexed to the Company’s common stock, the Company recorded a liability for the Warrants at fair value upon issuance on the Company's consolidated balance sheet. The common stock warrant liability is remeasured to fair value at the end of each reporting period.

As of December 31, 2024, no Warrants issued in the December 2024 Offering had been exercised.

On April 18, 2024, the Company closed the April 2024 Offering (see “Basis of Presentation and Liquidity” in Note 2 above).

Each Pre-Funded Warrant issued in the April 2024 Offering has an initial exercise price per share of $0.001, subject to certain adjustments. The Pre-Funded Warrants may be exercised at any time until exercised in full. A holder (together with its affiliates and other attribution parties) may not exercise any portion of a Pre-Funded Warrant to the extent that immediately prior to or after giving effect to such exercise the holder would own more than 9.99% of the Company’s outstanding Common

Stock immediately after exercise, which percentage may be changed at the holder’s election to a lower or higher percentage not in excess of 19.99% upon 61 days’ notice to the Company subject to the terms of the Pre-Funded Warrants.

As the Pre-Funded Warrants issued in the April 2024 Offering are indexed to the Company's own shares of common stock (and otherwise meet the requirements to be classified in equity), the Company recorded the consideration received from the issuance of the Pre-Funded Warrants as additional paid-in capital on the Company's condensed consolidated balance sheet as of December 31, 2024.

As of December 31, 2024, no Pre-Funded Warrants had been exercised.

At-The-Market Sales Agreements

On August 13, 2024, the Company entered into an Equity Distribution Agreement (the "2024 Sales Agreement") with an outside sales agent (the "Sales Agent") for the offer and sale of its common stock for an aggregate offering price of up to $60.0 million. The 2024 Sales Agreement provides that the Sales Agent is entitled to compensation in an amount equal to up to 3.0% of the gross sales proceeds of any common stock sold through the Sales Agent under the 2024 Sales Agreement, and the Company has provided the Sales Agent with certain indemnification rights.

During the year ended December 31, 2024, the Company sold 133,900 shares of its common stock under the 2024 Sales Agreement. The sales were made at a weighted average price of $7.02 per share, resulting in aggregate net proceeds of $925,000. As of December 31, 2024, there was $59.1 million of remaining capacity under the 2024 Sales Agreement.

On November 9, 2021, the Company entered into an ATM Equity Offering Sales Agreement (the “2021 Sales Agreement”) with outside sales agents for the offer and sale of its common stock for an aggregate offering price of up to $300.0 million. The 2021 Sales Agreement provides that the sales agents were entitled to compensation in an amount equal to up to 3.0% of the gross sales proceeds of any common stock sold under the 2021 Sales Agreement. During the three months ended March 31, 2024, the Company sold 543,620 shares of its common stock under the 2021 Sales Agreement at a weighted average price of $9.76 per share, resulting in aggregate net proceeds of $5.2 million. During the year ended December 31, 2023, the Company sold 875,305 shares of its common stock under the 2021 Sales Agreement at a weighted average price of $6.33 per share, resulting in aggregate net proceeds of $5.5 million. The 2021 Sales Agreement was terminated in August 2024 in connection with the entry into the 2024 Sales Agreement described above.

Other Issuances of Common Stock

During the three months ended March 31, 2023, the Company issued 760,083 shares of common stock pursuant to a securities class action litigation settlement, as described in Note 11.

Stock Options and Restricted Stock Units

The Board of Directors adopted the 2023 Omnibus Incentive Plan (the “2023 Plan”) on March 24, 2023, pursuant to which the Company may grant stock options, restricted stock awards, RSUs and other stock-based awards or short-term cash incentive awards to employees, directors and consultants.

The 2023 Plan was approved by stockholders on May 16, 2023. The aggregate number of shares of the Company’s common stock that may be issued under the 2023 Plan will not exceed the sum of 1,166,666 shares plus any shares that may return from time to time from the 2016 Omnibus Incentive Plan (as amended, the “2016 Plan”) as a result of expirations, terminations or forfeitures of awards outstanding under the 2016 Plan as of May 16, 2023. At December 31, 2024, the Company had 800,526 shares of common stock available for future grant under the 2023 Plan,188,082 shares underlying outstanding but unvested RSUs and 282,579 shares underlying options outstanding to purchase common stock under the 2023 Plan. The awards granted and available for future grant under the 2023 Plan generally vest over three years and have a maximum contractual term often years. The 2023 Plan terminates by its terms on March 24, 2033.

Following adoption of the 2023 Plan, no further awards may be made under the 2016 Plan, but outstanding awards continue to be governed by their existing terms. At December 31, 2024, the Company had 129,000 shares underlying outstanding but unvested RSU and options outstanding to purchase 904,669 shares of common stock under the 2016 Plan. The outstanding awards granted under the 2016 Plan generally vest over three years and have a maximum contractual term often years.

On June 24, 2022, the Company's board of directors adopted a stock-based incentive plan (the "2022 Inducement Plan"), which provides for the discretionary grant of nonstatutory stock options, stock appreciation rights, restricted stock awards, RSU awards, performance awards, and other awards to individuals as a material inducement to entering into employment with the Company. The aggregate number of shares of the Company’s common stock that may be issued under the 2022 Inducement Plan will not exceed 166,666 shares. At December 31, 2024 the Company had 84,328 shares of common stock available for future grant under the 2022 Inducement Plan,20,829 shares underlying outstanding but unvested RSUs and options outstanding to purchase 53,684 shares of common stock under the 2022 Inducement Plan. The 2022 Inducement Plan can be terminated by the Company's board of directors at any time.

The Amended and Restated 2007 Omnibus Incentive Plan (the "2007 Incentive Plan") was adopted on March 31, 2007 and terminated by its terms on March 31, 2017. At December 31, 2024, the Company had options outstanding to purchase 96,296 shares of common stock under the 2007 Incentive Plan. The awards granted under the 2007 Incentive Plan generally vested over three years and have a maximum contractual term often years.

Total employee and director stock-based compensation expense recognized in the consolidated statements of operations for the years ended December 31, 2024 and 2023 was $6.4 million and $10.4 million, respectively, of which $2.8 million and $4.5 million was included in research and development expenses and $3.6 million and $5.9 million was included in general and administrative expenses, respectively.

At December 31, 2024 and 2023, there was $2.1 million and $4.3 million, respectively, of total unrecognized compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 1.5 years and 1.3 years, respectively.

At December 31, 2024 and 2023, there was $2.0 million and $3.5 million, respectively, of total unrecognized compensation expense related to unvested RSUs, which is expected to be recognized over a weighted-average period of 1.6 years and 1.5 years, respectively.

The fair value of stock options granted to non-employees was estimated using the Black-Scholes pricing model. Total stock-based compensation expense for stock options and RSUs granted to non-employees for the years ended December 31, 2024 and 2023 was $226,000 and $669,000, respectively. As of December 31, 2024, options to purchase 66,056 shares of common stock granted to non-employees remained outstanding.

The following table summarizes total stock options outstanding at December 31, 2024:

At December 31, 2024, the aggregate intrinsic value of options outstanding was $1,000, the aggregate intrinsic value of options exercisable was $0, and the weighted average remaining contractual term of options exercisable was 5.5 years.

At December 31, 2024, the aggregate intrinsic value of unvested RSUs was $618,000 and the aggregate intrinsic value of RSUs which vested during the year ended December 31, 2024 was $1.3 million.

At December 31, 2024, options to purchase 1,337,228 shares of common stock and 337,911 RSUs were expected to vest.

Stock option activity under the Company’s equity incentive plans during the year ended December 31, 2024 was as follows:

Restricted stock unit activity under the Company’s equity incentive plans during the year ended December 31, 2024 was as follows:

The weighted average exercise price per share was $139.02 for the 38,503 options which expired during the year ended December 31, 2024 and $38.86 for the 9,357 options which expired during the year ended December 31, 2023.

The weighted average grant date fair value per share was $6.69 and $11.19 for options granted during the years ended December 31, 2024 and 2023, respectively.

The weighted average grant date fair value was $8.30 and $10.34 per share for RSUs granted during the years ended December 31, 2024 and 2023, respectively.

The Company received $68,000 in proceeds from the exercise of stock options during the years ended December 31, 2024. No stock options were exercised during the year ended December 31, 2023. The aggregate intrinsic value of options exercised was $39,000 during the year ended December 31, 2024.

Performance- and Market-Based RSUs

In May 2024, the Company granted performance- and-market-based RSUs (such performance-based grants, the "PSU Awards") to key employees under the 2023 Plan. Each PSU was expressed as a target number of RSUs. With respect to the PSU Awards, the Company's Board of Directors established specified performance goals and corresponding performance periods over which the goals must be attained, the satisfaction of which are conditions to earning the PSU Awards and vesting of the underlying RSUs. As of December 31, 2024,83,800 performance- and market-based RSUs were outstanding.

Of the target number of RSUs underlying each PSU Award, up to 70% (the "Milestone-based RSUs") will vest based on the achievement of specified milestones relating to the development, regulatory status and commercialization of the Company’s lead product candidate INO-3107 (each, a "Milestone," and collectively, the "Milestones"). Each Milestone has a specified deadline for achievement ranging between the end of 2025 and the end of 2027.

The remaining 30% of the target number of RSUs underlying each PSU Award (the "Market-based RSUs") will be eligible to vest based on the Company’s achievement of total stockholder return relative to a peer group consisting of companies in the Russell 2000 Biotechnology Subsector index (the “Relative TSR”) over the period beginning on June 1, 2024 and ending on December 31, 2027 (the “Performance Period”), expressed as a percentile ranking.

The number of Market-based RSUs, if any, actually earned based on the achievement of the Relative TSR goal may range from 50% of the target number of RSUs for performance at a specified threshold percentile, to 100% of the target number of RSUs for performance at the target percentile, and up to 150% of the target number of RSUs for performance at or above a specified maximum percentile. In the event that actual Relative TSR performance is between the threshold and target levels or between the target and maximum levels, the number of RSUs earned based on Relative TSR will be determined based on linear interpolation between the specified percentiles. If the Company’s actual Relative TSR performance is below the threshold percentile, then no RSUs would be earned based on Relative TSR. The number of RSUs earned based on Relative TSR may not exceed the target number of RSUs eligible to vest based on Relative TSR if the Company’s total stockholder return is negative for the Performance Period.

The Company valued the Milestone-based RSUs based on the grant date closing price per share. The Company recognizes stock-based compensation expense over the performance period, if it is probable that the performance condition will be achieved. Adjustments to stock-based compensation expense are made, as needed, each reporting period based on changes in the Company's estimate of the number of units that are probable of vesting.

The Company valued the Market-based RSUs on the grant date using the Monte Carlo simulation method, a generally accepted statistical technique used to simulate a range of possible future stock prices for the Company and the peer group. The determination of fair value was affected by the Company's stock price and a number of assumptions including the expected volatility and the risk-free interest rate. The Company will recognize stock-based compensation expense ratably over the performance period of the award. The market-based RSUs will cliff-vest at the end of thethree-year period ranging from zero to 150% of the target number of awards granted.

The significant assumptions used in the Monte Carlo simulation method were as follows:

The grant date fair value of the Milestone-based RSUs was $643,000 based on the grant date closing price per share of $10.96. As of December 31, 2024, the underlying performance milestones of the Milestone-based RSUs were determined to be not probable of achievement, andno stock-based compensation expense was recognized for the year then ended.

The grant date fair value of the Market-based RSUs was $269,000 based on the fair value of $10.69 per share as determined using the Monte Carlo simulation method. For the year ended December 31, 2024, the Company recognized $44,000 in stock-based compensation for the Market-based RSUs.

December 2024 Performance-Based Awards

In December 2024, the Company granted performance-based stock options and RSUs (such performance-based grants, the "December 2024 Awards") to key employees under the 2023 Plan. Each award was expressed as a target number of stock options and RSUs. With respect to the December 2024 Awards, the Company's Board of Directors established specified performance goals and a corresponding performance period over which the goals must be attained, the satisfaction of which are conditions to earning the December 2024 Awards and vesting of the underlying stock options and RSUs. As of December 31, 2024, December 2024 Awards were outstanding covering 25,686 shares of common stock underlying stock options and 19,314 shares of common stock underlying RSUs.

The grant date fair value of the performance-based RSUs was $34,000 based on the grant date closing price per share of $1.78. The grant date fair value of the performance-based stock options was $38,000 based on the Black-Scholes per share value of $1.46. As of December 31, 2024, the underlying performance milestones of the December 2024 Awards were determined to be not probable of achievement, andno stock-based compensation expense was recognized for the year then ended.

11. Commitments and Contingencies

Leases

The Company leases approximately 56,600 square feet of office, laboratory, and manufacturing space in San Diego, California and approximately 57,400 square feet of office space in Plymouth Meeting, Pennsylvania under various non-cancellable operating lease agreements with remaining lease terms as of December 31, 2024 of 2.4 to 5.0 years, which represent the non-cancellable periods of the leases. The Company has excluded the extension options from its lease terms in the calculation of future lease payments as they are not reasonably certain to be exercised. The Company's lease payments consist primarily of fixed rental payments for the right to use the underlying leased assets over the lease terms as well as payments for common area maintenance and administrative services. The Company has received customary incentives from its landlords, such as reimbursements for tenant improvements and rent abatement periods, which effectively reduce the total lease payments owed for these leases.

The base rent adjusts periodically throughout the term of the leases. Rent payments under the leases include base rent with annual increases of approximatelytwo tothree percent, and additional monthly fees to cover the Company's share of certain facility expenses, including utilities, property taxes, insurance and maintenance.

The Company performed an evaluation of its contracts with customers and suppliers in accordance with ASC Topic 842 and determined that, except for the real estate leases described above and various copier leases, none of its other contracts contain a right-of-use asset.

Operating lease right-of-use assets and liabilities on the consolidated balance sheet represents the present value of the remaining lease payments over the remaining lease terms. Payments for additional monthly fees to cover the Company's share of certain facility expenses are not included in operating lease right-of-use assets and liabilities. The Company uses its incremental borrowing rate to calculate the present value of its lease payments, as the implicit rates in the leases are not readily determinable.

As of December 31, 2024, the maturities of the Company's operating lease liabilities were as follows:

Lease costs included in operating expenses in the consolidated statements of operations for the years ended December 31, 2024 and 2023 were $2.6 million and $3.5 million, respectively. Operating lease costs consisting of the fixed lease payments included in operating lease liabilities are recorded on a straight-line basis over the lease terms. Variable lease costs are recorded as incurred.

In 2023, the Company entered into agreements to sublease a total of approximately 11,400 square feet in its Plymouth Meeting headquarters with sublease terms through December 31, 2026.

During 2024, the Company amended the sublease agreements for its Plymouth Meeting headquarters to extend one sublease term through December 31, 2027 and the other through December 31, 2029.

In the normal course of business, the Company is a party to a variety of agreements pursuant to which it may be obligated to indemnify the other party. It is not possible to predict the maximum potential amount of future payments under these types of agreements due to the conditional nature of the Company's obligations and the unique facts and circumstances involved in each particular agreement. Historically, payments made by the Company under these types of agreements have not had a material effect on its business, consolidated results of operations or financial condition.

Legal Proceedings

Securities Litigation

In 2020, a purported shareholder class action complaint was filed naming the Company and its former President and Chief Executive Officer as defendants and alleging that the Company made materially false and misleading statements in violation of certain federal securities laws. In 2022 the parties negotiated an agreement in principle to settle the shareholder class action complaint, which was approved by the court in January 2023. Under the settlement, the Company agreed to pay $30.0 million in cash and issued 760,083 shares of its common stock, with a value of $14.0 million at the time, to settle all outstanding claims. The Company's insurance carriers paid the $30.0 million cash component of the settlement.

Shareholder Derivative Litigation

In 2020, a purported shareholder derivative complaint was filed naming eight current and former directors of the Company as defendants. The lawsuit asserted state and federal claims and was based on the same alleged misstatements as the shareholder class action complaint described above. The lawsuit accused the Company’s board of directors of failing to exercise reasonable and prudent supervision over the Company’s management, policies, practices, and internal controls. The plaintiff sought unspecified monetary damages on behalf of the Company as well as governance reforms.

Between 2020 and 2022, additional shareholder derivative complaints were filed.

In June 2023, the court entered an order preliminarily approving a proposed settlement of the derivative claims, in accordance with a Stipulation of Settlement. The Stipulation of Settlement contemplated that, following the settlement hearing and the final approval of the settlement by the court, the Company would implement certain corporate governance reforms described in the Stipulation of Settlement. The preliminary order also approved the form and manner of the notice of the Settlement. As part of the Settlement, in July 2023 the Company paid $1.2 million to plaintiffs’ counsel for their fees and expenses. In October 2023, the court entered an order and final judgment approving the Settlement, which became effective in November 2023. The Company has implemented the corporate governance reforms in response to the provisions of the Stipulation of Settlement.

VGXI Litigation

In June 2020, the Company filed a complaint in the Court of Common Pleas of Montgomery County, Pennsylvania against VGXI, Inc. and GeneOne Life Science, Inc., or GeneOne, and together with VGXI, Inc. collectively referred to as VGXI, alleging that VGXI had materially breached the Company’s supply agreement with them. The complaint seeks declaratory judgments, specific performance of the agreement, injunctive relief, an accounting, damages, attorneys’ fees, interest, costs and other relief from VGXI. In June 2020, the Company filed a petition for preliminary injunction, which was denied.

Following an appeal by the Company, in July 2020, VGXI filed counterclaims against the Company, alleging that the Company had breached the supply agreement, as well as misappropriation of trade secrets and unjust enrichment. The counterclaims seek injunctive relief, damages, attorneys’ fees, interest, costs and other relief from the Company. VGXI also filed a third-party complaint against Ology Bioservices, Inc., a contract manufacturing organization that the Company had engaged to provide services similar to those that were being provided by VGXI, but VGXI later discontinued its third-party claims. The Company filed an answer to VGXI’s counterclaims, disputing the allegations and the claims raised in VGXI’s filing. In October 2020, the Company filed a notice of discontinuance of appeal with the Pennsylvania Superior Court. A trial date for the litigation has not been set.

The Company intends to aggressively prosecute the claims set forth in its complaint against VGXI and to vigorously defend itself against VGXI’s counterclaims.

GeneOne Litigation

In December 2020, GeneOne filed a complaint in the Court of Common Pleas of Montgomery County, Pennsylvania against the Company, alleging that the Company had breached the CELLECTRA Device License Agreement, or the Agreement, between the Company and GeneOne. The Company terminated the Agreement in October 2020. The complaint asserts claims for breach of contract, declaratory judgment, unfair competition, and unjust enrichment. The complaint seeks injunctive relief, an accounting, damages, disgorgement of profits, attorneys’ fees, interest, and other relief from the Company. The Company filed preliminary objections to the complaint, which were overruled by the court. In September 2021, the Company filed an answer to the complaint, new matter, and counterclaims. The Company’s counterclaims allege that GeneOne breached the Agreement and assert claims for breach of contract and declaratory judgment. The counterclaims seek damages, interest, expenses, attorney’s fees, and costs. In October 2021, GeneOne filed its answer to the Company’s counterclaims and new matter. On February 29, 2024, the Company filed a motion for summary judgment. On April 1, 2024, GeneOne filed an opposition to the Company’s motion for summary judgment. On June 28, 2024, the court denied the motion for summary judgment. A trial date for this litigation has not been set.

The Company intends to aggressively prosecute the claims set forth in its counterclaims against GeneOne and to vigorously defend itself against the claims in GeneOne’s complaint.

Other Matters

From time to time, the Company may be involved in disputes, including litigation, relating to claims arising out of operations in the normal course of its business. Any of these claims could subject the Company to costly legal expenses and, while the Company generally believes that it has adequate insurance to cover many different types of liabilities, its insurance carriers may deny coverage or its policy limits may be inadequate to fully satisfy any damage awards or settlements. If this were to happen, the payment of any such awards could have a material adverse effect on the Company's consolidated results of operations and financial position. Additionally, any such claims, whether or not successful, could damage the Company's reputation and business. Except as described above, the Company is not a party to any legal proceedings, the adverse outcome of which, in management’s opinion, individually or in the aggregate, would be reasonably expected to have a material adverse effect on the Company’s consolidated results of operations or financial position.

12. Income Taxes

In accordance with the guidance pursuant to accounting for income taxes, a deferred tax asset or liability is determined based on the difference between the financial statement and tax basis of assets and liabilities as measured by the enacted tax rates which will be in effect when these differences reverse. The Company provides a valuation allowance against net deferred tax assets unless, based upon the available evidence, it is more likely than not that the deferred tax asset will be realized.

The components of pretax loss from operations are as follows:

There wasno provision for or benefit from income taxes for the years ended December 31, 2024 and 2023.

The reconciliation of income taxes attributable to continuing operations computed at the statutory tax rates to income tax benefit, using a 21% statutory tax rate for December 31, 2024 and 2023, is as follows:

Significant components of the Company’s deferred tax assets and liabilities as of December 31, 2024 and 2023 are shown below:

As of December 31, 2024, the Company had federal, California and other state tax net operating loss (NOL) carryforwards of $1.1 billion, $259.9 million and $88.6 million, respectively, net of the net operating losses that will expire due to IRC Section 382 limitations. The aggregate federal net operating losses generated in 2018 and after for the amount of $801.9 million will carryforward indefinitely and be available to offset up to 80% of future taxable income each year. The federal NOL carryforward began to expire in 2025, and the California and other state NOL carryforwards will begin and have begun to expire in 2028 and 2025, respectively, unless previously utilized.

The Company also had Korean NOL carryforward of $1.0 million as of December 31, 2024. The Korean NOLs are available to offset up to 60% of future taxable income and will begin to expire in 2035, unless previously utilized.

In addition, as of December 31, 2024, the Company had federal and state research and development (R&D) tax credit carryforwards of $46.1 million and $7.9 million, respectively. The federal tax credit carryforwards will begin to expire in 2029. The California research tax credits do not expire.

Based upon statute, federal and state losses and credits are expected to expire as follows (in millions):

Pursuant to Internal Revenue Code (IRC) Sections 382 and 383, annual use of the Company’s NOL and R&D credit carryforwards may be limited in the event that a cumulative change in ownership of more than 50% occurs within a three-year period. The Company has completed an IRC Section 382/383 analysis regarding the limitation of NOL and R&D credit carryforwards as of December 31, 2024. As a result of the analysis, the Company estimates that approximately $5.3 million of tax benefits related to NOL and R&D carryforwards will expire unused. Accordingly, the related NOL and R&D credit carryforwards have been removed from deferred tax assets, accompanied by a corresponding reduction of the valuation allowance. Due to the existence of the valuation allowance, limitations created by current and future ownership changes, if any, related to the Company's operations in the United States will not impact its effective tax rate. Any additional ownership changes, could further limit the ability to use the NOL and R&D carryforwards.

The Tax Cuts and Jobs Act of 2017 subjects a U.S. stockholder to tax on Global Intangible Low-Taxed Income (GILTI) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. The Company has elected to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. For 2024 and 2023, the Company did not generate any GILTI due to losses earned by its foreign subsidiary.

The following table summarizes the activity related to the Company's unrecognized tax benefits:

The amount of unrecognized tax benefits that, if recognized and realized, would affect the effective tax rate was $22.9 million and $20.5 million as of December 31, 2024 and 2023, respectively, subject to valuation allowances. The Company has not recorded any interest and penalties on the unrecognized tax positions as the Company has continued to generate net operating losses after accounting for the unrecognized tax benefits. The Company does not anticipate that the total amount of unrecognized tax benefits will significantly increase or decrease within twelve months of the reporting date.

The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax in multiple state and foreign jurisdictions. With few exceptions, the Company is no longer subject to United States federal income tax examinations for years before 2021 and state and local income tax examinations before 2020. However, to the extent allowed by law, the tax authorities may have the right to examine prior periods where net operating losses were generated and carried forward, and make adjustments up to the amount of the NOL carryforward amount. The Company is not to its knowledge currently under Internal Revenue Service (“IRS”), state, local or foreign tax examination.

13.401(k) Plan

The Company has adopted a 401(k) Profit Sharing Plan covering substantially all of its employees. The defined contribution plan allows the employees to contribute a percentage of their compensation each year. The Company currently matches 50% of its employees’ contributions, up to 6% of their annual compensation. The Company’s contributions are recorded as expense in the accompanying consolidated statements of operations and totaled $961,000 and $1.4 million for the years ended December 31, 2024 and 2023, respectively.

14. Related Party Transactions

Plumbline Life Sciences, Inc.

The Company owned 597,808 shares of common stock in PLS as of December 31, 2024 and 2023, representing a 17.3% and 17.8% ownership interest, respectively. The Company's investment in PLS is recorded as investment in affiliated entity on the consolidated balance sheet as of December 31,2024 and 2023, and was valued at $1.6 million and $2.8 million, respectively, based on the closing price of the shares on the Korea New Exchange Market at the applicable balance sheet date. Oneof the Company's directors, Dr. David B. Weiner, acts as a consultant to PLS.

The Wistar Institute

Dr. Weiner is a director of the Vaccine Center of The Wistar Institute ("Wistar") and an Executive Vice President of Wistar.

In 2016, the Company entered into collaborative research agreements with Wistar for preventive and therapeutic DNA-based immunotherapy applications and products developed by Dr. Weiner and Wistar for the treatment of cancers and infectious diseases. Under the terms of the agreement, the Company reimbursed Wistar for all direct and indirect costs incurred in the conduct of the collaborative research, not to exceed $3.1 million during thefive-year term of the agreement. In 2021, upon expiration of the 2016 agreements, the Company entered into new collaborative research agreements with Wistar with the same terms. The Company has the exclusive right to in-license new intellectual property developed under this agreement.

In 2020, the Company received a $10.7 million sub-grant through Wistar, which was amended in 2021 to $13.6 million, for the preclinical development and translational studies of dMAbs as countermeasures for COVID-19. In August 2024, the sub-grant was amended to a total of $12.5 million in funding through September 2025.

In 2022, the Company received a $1.2 million sub-grant through Wistar, which was amended in 2024 to $2.4 million with funding through November 2024, with an option for an additional $4.2 million in funding that extends the sub-grant through November 2027. The Company will support the Wistar lead consortium in the research and development of synthetic DNA-launched nanoparticles (dLNPs) for vaccination against HIV infection.

Deferred grant funding recognized from Wistar and recorded as contra-research and development expense is related to work performed by the Company on the research sub-contract agreements. For the years ended December 31, 2024 and 2023, the Company recorded $482,000 and $1.0 million, respectively, as contra-research and development expense from Wistar.

Research and development expenses recorded from Wistar relate primarily to the collaborative research agreements. Research and development expenses recorded from Wistar for the years ended December 31, 2024 and 2023 were $1.5 million and $1.8 million, respectively. At December 31, 2024 and 2023, the Company had an accounts receivable balance of $1.2 million and $2.4 million, respectively, and an accounts payable and accrued liability balance of $1.4 million and $1.1 million, respectively, related to Wistar. As of December 31, 2024 and 2023, the Company had a prepaid expense balance of $0 and $20,000, respectively, and recorded $0 and $22,000, respectively, as deferred grant funding on its consolidated balance sheet related to Wistar.

15. Geneos Therapeutics, Inc.

In 2016, the Company formed Geneos Therapeutics ("Geneos") to develop and commercialize neoantigen-based personalized cancer therapies. The Company's Chief Scientific Officer Dr. Laurent Humeau is on the Board of Directors of Geneos. The Company's director Dr. David B. Weiner is the Chairman of the Scientific Advisory Board of Geneos.

As of December 31, 2024, the Company held 23% of the outstanding equity of Geneos, on an as-converted to common stock basis. The Company accounts for its common stock investment in Geneos as an equity method investment under ASC 323. Due to continuing net losses of Geneos, the Company’s investment had been reduced to $0 as of each of December 31, 2024 and 2023. The Company has not made any further investment in Geneos. The Company will not reduce its investment below $0 and will not record its share of further net losses of Geneos, as the Company has no obligation to fund Geneos.

The Company continues to exclusively license its immunotherapy platform and CELLECTRA technology to Geneos to be used in the field of personalized, neoantigen-based therapy for cancer. The license agreement provides for potential royalty payments to the Company in the event that Geneos commercializes any products using the licensed technology. The Company is not obligated to use any of its assets to fund the future operations of Geneos.

16. Segment Information

The Company operates asone reportable segment in the United States, which includes all activities related to the development and commercialization of its DNA medicines to help treat and protect people from HPV-associated diseases, cancer and infectious diseases.

The Company's Chief Executive Officer (CEO) is its Chief Operating Decision Maker (CODM), responsible for allocating resources and assessing Company performance using aggregated financial information. Utilizing aggregated financial information enables the CODM to determine the most appropriate resource allocation across the organization, research and development projects or other initiatives consistent with the Company's corporate objectives. The CODM primarily uses total net loss as reported on the statements of operations and comprehensive loss to measure segment loss, supplemented by certain additional significant expense details reflected in the table below. The measure of segment assets is reported on the consolidated balance sheet as total assets.

Detailed information regarding the Company's single operating segment's revenues, expenses and operating loss are as follows:

(a) Net of contributions received from grant agreements and recorded as contra-research and development expense.

(b) Includes impairment of intangible assets of $2.0 million recorded in 2023.

17. Subsequent Events

From January 1, 2025 through the date of these financial statements, the Company sold 512,518 shares of common stock under the 2024 Sales Agreement at a weighted average price of $2.16 per share, for net proceeds of $1.1 million.