FORM10-K (Mark One) ☒Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934For the fiscal year endedDecember 31, 2024Or☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934For the transition period from ________ to ___________ Commission File No.0-23047 SIGA Technologies, Inc.(Exact name of registrant as specified in its charter) 13-3864870(IRS Employer Identification. No.) Registrant’s telephone number, including area code: (212)672-9100 Securities registered pursuant to Section 12(b) of the Act: Securities registered pursuant to Section 12(g) of the Act:None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes☐No☒. Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes☐No☒. Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities ExchangeAct of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) hasbeen subject to such filing requirements for the past 90 days.Yes☒No☐. Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant toRule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant wasrequired to submit such files).Yes☒No☐. Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reportingcompany or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company”and “emerging growth company” in Rule 12b-2 of the Exchange Act: Large accelerated filer☐Accelerated filer☒Non-acceleratedfiler☐Smaller reporting company☐Emerging growth company☐. If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section 13 (a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness ofits internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered publicaccounting firm that prepared or issued its audit report.☒ Table of Contents If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrantincluded in the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-basedcompensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act) Yes☐No☒. The aggregate market value of the voting and non-voting common stock held by non-affiliates of the registrant, based upon the closing saleprice of the common stock on June 30,2024 as reported on The Nasdaq Global Market was approximately $351,132,884. As of February 14,2025, the registrant had outstanding71,436,927shares of common stock. DOCUMENTS INCORPORATED BY REFERENCE The following document is incorporated herein by reference: DocumentProxy Statement for the Company’s 2025 AnnualMeeting of Stockholders Parts Into Which IncorporatedPart III SIGA TECHNOLOGIES, INC.FORM 10-K Table of Contents PART IItem 1. Item 1A.Item 1B.Item 1C.Item 2.Item 3.Item 4. BusinessRisk FactorsUnresolved Staff CommentsCybersecurityPropertiesLegal ProceedingsMine Safety Disclosures Market For Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of EquitySecurities[Reserved]Management’s Discussion and Analysis of Financial Condition and Results of OperationsQuantitative and Qualitative Disclosures About Market RiskFinancial Statements and Supplementary DataChanges in and Disagreements with Accountants on Accounting and Financial DisclosureControls and ProceduresOther InformationDisclosure Regarding Foreign Jurisdictions that Prevent Inspections Item 6.Item 7.Item 7A.Item 8.Item 9.Item 9A.Item 9B.Item 9C. Item 10.Directors, Executive Officers and Corporate GovernanceItem 11.Executive CompensationItem 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder MattersItem 13.Certain Relationships and Related Transactions, and Director IndependenceItem 14.Principal Accounting Fees and Services Exhibits, Financial Statement SchedulesForm 10-K Summary Item 15.Item 16.