SIGA / SIGA Technologies, Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

SIGA Technologies, Inc.
US ˙ NasdaqGM ˙ US8269171067

Mga Batayang Estadistika
CIK 1010086
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to SIGA Technologies, Inc.
SEC Filings (Chronological Order)
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August 5, 2025 EX-99.1

SIGA Reports Financial Results for Three and Six Months Ended June 30, 2025

Exhibit 99.1 SIGA Reports Financial Results for Three and Six Months Ended June 30, 2025 • Generated Product Revenues of $79 million for the Three Months Ended June 30 • Awarded Additional Development Funding of $27 million under the BARDA 19C Contract during the Three Months Ended June 30 • Corporate Update Conference Call Today at 4:30 PM ET NEW YORK, August 5, 2025 (GLOBENEWSWIRE) - SIGA Techno

August 5, 2025 EX-3.2

CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF SIGA TECHNOLOGIES, INC. Pursuant to Section 242 of the General Corporation Law of the State of Delaware

Exhibit 3.2 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF SIGA TECHNOLOGIES, INC. Pursuant to Section 242 of the General Corporation Law of the State of Delaware SIGA Technologies, Inc., a Delaware corporation (hereinafter called the “Corporation”), does hereby certify as follows: FIRST: The name of the corporation is SIGA Technologies, Inc. The name under wh

August 5, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended June 30, 2025 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-2304

August 5, 2025 8-K

(State or other jurisdiction of incorporation or organization)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 5, 2025 SIGA TECHNOLOGIES, INC.

August 5, 2025 EX-10.1

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.1 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 12 2. AMENDMENT/MODIFICATION NO. P00019 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. AS

June 12, 2025 EX-3.1

AMENDED AND RESTATED SIGA TECHNOLOGIES, INC. A DELAWARE CORPORATION As in effect on June 10, 2025 ARTICLE I OFFICES

Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF SIGA TECHNOLOGIES, INC. A DELAWARE CORPORATION As in effect on June 10, 2025 ARTICLE I OFFICES The registered office shall be in the City of Wilmington, County of New Castle, State of Delaware. The Corporation may also have offices at such other places both within and without the State of Delaware as the board of directors (the “Board”) may from time to

June 12, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 10, 2025 SIGA TECHNOLOGIES, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 10, 2025 SIGA TECHNOLOGIES, INC.

May 8, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended March 31, 2025 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-230

May 8, 2025 EX-10.1

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.1 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 8 2. AMENDMENT/MODIFICATION NO. P00017 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. ASP

May 8, 2025 EX-99.1

SIGA Reports Financial Results for Three Months Ended March 31, 2025

Exhibit 99.1 SIGA Reports Financial Results for Three Months Ended March 31, 2025 • Received $26 Million IV TPOXX Procurement Order from the U.S. Government in March • $94 million in TPOXX Orders (to be Delivered to U.S. Strategic National Stockpile) outstanding as of March 31, 2025 • Corporate Update Conference Call Today at 4:30 PM ET NEW YORK, May 8, 2025 (GLOBENEWSWIRE) - SIGA Technologies, In

May 8, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 8, 2025 SIGA TECHNOLOGIES, INC.

May 8, 2025 EX-10.2

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.2 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 11 2. AMENDMENT/MODIFICATION NO. P00018 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. AS

April 28, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934         Filed by the Registrant ☒     Filed by a Party other than the Registrant  ☐         Check the appropriate box:          ☐     Preliminary Proxy Statement  ☐     Confidential, for Use of the Commission Only (a

April 28, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy St

April 18, 2025 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934         Filed by the Registrant ☒     Filed by a Party other than the Registrant  ☐         Check the appropriate box:         ☒     Preliminary Proxy Statement  ☐     Confidential, for Use of the Commission Only (as

April 8, 2025 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 8, 2025 SIGA TECHNOLOGIES INC (Exact name of registrant as specified in its charter) Delaware 0-23047 13-3864870 (State or other jurisdiction of incorporation or organization) (Commission file number) (I.

March 18, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 17, 2025 SIGA TECHNOLOGIES,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 17, 2025 SIGA TECHNOLOGIES, INC.

March 11, 2025 EX-99.1

SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2024

Exhibit 99.1 SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2024 • Increased Product Sales to $133 Million in 2024 • Generated Pre-tax Operating Income and Net Income of $70 Million and $59 Million, Respectively, in 2024 • Corporate Update Conference Call Today at 4:30 PM ET NEW YORK, Mar. 11, 2025 (GLOBENEWSWIRE) - SIGA Technologies, Inc. (SIGA) (Nasdaq: SIGA), a co

March 11, 2025 EX-19.1

SIGA Technologies, Inc. Insider Trading Compliance Policy and Procedures (as of June 11, 2024)

Exhibit 19.1 SIGA Technologies, Inc. Insider Trading Compliance Policy and Procedures (as of June 11, 2024) Federal and state laws prohibit trading in the securities of a company while in possession of material nonpublic information and in breach of a duty of trust or confidence. These laws also prohibit anyone who is aware of material nonpublic information from providing this information to other

March 11, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2024 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-23047 SI

March 11, 2025 EX-10.NN

SIGA TECHNOLOGIES, INC. 2010 STOCK INCENTIVE PLAN (as amended and restated, effective May 23, 2017) ARTICLE I General

Exhibit 10(nn) SIGA TECHNOLOGIES, INC. 2010 STOCK INCENTIVE PLAN (as amended and restated, effective May 23, 2017) ARTICLE I General 1.1 Purpose The purpose of the SIGA Technologies, Inc. 2010 Stock Incentive Plan (the “Plan”) is to establish a flexible vehicle through which SIGA Technologies, Inc., a Delaware corporation (the “Company”), may offer equity-based compensation incentives to eligible

March 11, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 11, 2025 SIGA TECHNOLOGIES, INC.

December 13, 2024 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 10, 2024 SIGA TECHNOLOGIES, INC.

December 13, 2024 EX-3.1

AMENDED AND RESTATED SIGA TECHNOLOGIES, INC. A DELAWARE CORPORATION As in effect on December 10, 2024 ARTICLE I

Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF SIGA TECHNOLOGIES, INC. A DELAWARE CORPORATION As in effect on December 10, 2024 ARTICLE I OFFICES The registered office shall be in the City of Wilmington, County of New Castle, State of Delaware. The Corporation may also have offices at such other places both within and without the State of Delaware as the board of directors (the “Board”) may from time

December 10, 2024 EX-99.1

Interim Results from STOMP Study of SIGA’s Tecovirimat in Treatment of Mpox Announced

Exhibit 99.1 Interim Results from STOMP Study of SIGA’s Tecovirimat in Treatment of Mpox Announced ◾ Interim analysis shows that tecovirimat did not improve time to lesion resolution compared to placebo in adults with mild to moderate clade II mpox ◾ Study stopped enrolling patients in all study arms ◾ Results affirm tecovirimat’s strong safety profile ◾ Efficacy in patients with more severe disea

December 10, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 10, 2024 SIGA TECHNOLOGIE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 10, 2024 SIGA TECHNOLOGIES, INC.

November 7, 2024 EX-10.7

August 30, 2024

Exhibit 10.7 August 30, 2024 Meridian Medical Technologies, LLC 1945 Craig Road St. Louis, MO 63146 USA Re: Letter Amendment to Promotion Agreement To Whom It May Concern: Reference is hereby made to that certain Promotion Agreement, dated as of May 31, 2019 (as amended prior to the date hereof, the “Agreement”), by and between SIGA Technologies, LLC. (“SIGA”) and Meridian Medical Technologies, In

November 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended September 30, 2024 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0

November 7, 2024 EX-10.6

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIALAND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT #1 to STATEMENT OF WORK #1

Exhibit 10.6 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIALAND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT #1 to STATEMENT OF WORK #1 This Amendment #1 to Statement of Work #1 dated October 19, 2020 (this “Amendment #1”), is entered into and effective September 26, 2024 (“Amendment #1 Effect

November 7, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 7, 2024 SIGA TECHNOLOGIES, INC.

November 7, 2024 EX-10.5

EXHIBIT A STATEMENT OF WORK #1

Exhibit 10.5 EXHIBIT A STATEMENT OF WORK #1 This Statement of Work, details the services that Consultant will provide to SIGA. The services under this Statement of Work shall be conducted under and subject to the terms and conditions of the Consulting Agreement between SIGA and Company dated Month Day, Year, hereinafter (“Agreement”). Scope of Services: Tides Group, LLC will develop and lead a gov

November 7, 2024 EX-10.4

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIALAND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT #1 CONSULTING AGREEMENT

Exhibit 10.4 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIALAND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT #1 CONSULTING AGREEMENT This Amendment #1 to the Consulting Agreement dated October 19, 2020 (this “Amendment”), is entered into and effective September 1, 2022 (“Amendment Effective Da

November 7, 2024 EX-10.3

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIALAND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. CONSULTING AGREEMENT with SIGA Technologies, Inc.

Exhibit 10.3 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIALAND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. CONSULTING AGREEMENT with SIGA Technologies, Inc. This Agreement is made and entered into as of the date of date of last signature below (the “Effective Date”), by and between SIGA Technologies,

November 7, 2024 EX-99.1

SIGA Reports Financial Results for Three and Nine Months Ended September 30, 2024

Exhibit 99.1 SIGA Reports Financial Results for Three and Nine Months Ended September 30, 2024 • Product Revenues for the Three and Nine months Ended September 30, 2024 were $9 million and $53 million, respectively • Received $122 Million of Procurement Orders from the U.S. Government in the Third Quarter • Corporate Update Conference Call Today at 4:30 PM ET NEW YORK - SIGA Technologies, Inc. (SI

October 4, 2024 EX-10.2

SECOND AMENDMENT TO THIRD AMENDED AND RESTATED EMPLOYMENT AGREEMENT

Exhibit 10.2 SECOND AMENDMENT TO THIRD AMENDED AND RESTATED EMPLOYMENT AGREEMENT This amendment to the Third Amended and Restated Employment Agreement (the “Amendment”) is made and entered into on this October 1, 2024, by and between SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Dr. Dennis E. Hruby (the “Executive” and, together with the Company, the “Parties”). WHEREAS, the

October 4, 2024 EX-10.1

AMENDMENT TO AMENDED AND RESTATED EMPLOYMENT AGREEMENT

Exhibit 10.1 AMENDMENT TO AMENDED AND RESTATED EMPLOYMENT AGREEMENT This amendment to the Amended and Restated Employment Agreement (the “Amendment”) is made and entered into on this October 1, 2024, by and between SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Daniel J. Luckshire (the “Executive” and, together with the Company, the “Parties”). WHEREAS, the Parties previously

October 4, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 4, 2024 (October 1, 2024)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 4, 2024 (October 1, 2024) SIGA TECHNOLOGIES, INC.

September 23, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 23, 2024 SIGA TECHNOLOGI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 23, 2024 SIGA TECHNOLOGIES, INC.

September 20, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 20, 2024 (September 19, 2024) SIGA TECHNOLOGIES, INC.

August 15, 2024 EX-99.1

Topline Results from PALM 007 Study of SIGA'S Tecovirimat in Treatment of Mpox Released

Exhibit 99.1 Topline Results from PALM 007 Study of SIGA'S Tecovirimat in Treatment of Mpox Released ◾ Preliminary analysis shows the study did not reach statistical significance on its primary endpoint of tecovirimat being superior to placebo in lesion resolution for all patients ◾ Results suggest tecovirimat provides clinical benefit vs. placebo in two important patient populations: those treate

August 15, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 15, 2024 SIGA TECHNOLOGIES,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 15, 2024 SIGA TECHNOLOGIES, INC.

August 1, 2024 EX-10.2

SIGA Technologies, Inc. Restricted Stock Unit Grant Agreement

Exhibit 10.2 SIGA Technologies, Inc. Restricted Stock Unit Grant Agreement THIS AGREEMENT, made as of the [●], day of [●], 20, between SIGA Technologies, Inc. (the “Company”) and [NAME] (the “Participant”). WHEREAS, the Company has adopted and maintains the SIGA Technologies, Inc. 2010 Stock Incentive Plan, as amended (the “Plan”), to establish a flexible vehicle through which the Company may offe

August 1, 2024 EX-10.6

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.6 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 9 2. AMENDMENT/MODIFICATION NO. P00016 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. See

August 1, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 1, 2024 SIGA TECHNOLOGIES, INC.

August 1, 2024 EX-99.1

SIGA Reports Financial Results for Three and Six Months Ended June 30, 2024

Exhibit 99.1 SIGA Reports Financial Results for Three and Six Months Ended June 30, 2024 • Generated Product Sales of $21 Million in the Second Quarter, and $45 Million in the Six Months Ended June 30, 2024 • Received $113 Million Procurement Order from U.S. Government for Oral TPOXX in July • Corporate Update Conference Call Today at 4:30 PM ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: S

August 1, 2024 EX-10.1

SIGA Technologies, Inc. Stock Option Grant Agreement

Exhibit 10.1 SIGA Technologies, Inc. Stock Option Grant Agreement THIS AGREEMENT, made as of the [●], day of [●], 20, between SIGA Technologies, Inc. (the “Company”) and [NAME] (the “Participant”). WHEREAS, the Company has adopted and maintains the SIGA Technologies, Inc. 2010 Stock Incentive Plan, as amended (the “Plan”), to establish a flexible vehicle through which the Company may offer equity-

August 1, 2024 EX-10.3

SIGA Technologies, Inc. Performance-Based Restricted Stock Unit Grant Agreement

Exhibit 10.3 SIGA Technologies, Inc. Performance-Based Restricted Stock Unit Grant Agreement THIS AGREEMENT, made as of [•], between SIGA Technologies, Inc. (the “Company”) and [NAME] (the “Participant”). WHEREAS, the Company has adopted and maintains the SIGA Technologies, Inc. 2010 Stock Incentive Plan, as amended (the “Plan”), to establish a flexible vehicle through which the Company may offer

August 1, 2024 EX-10.5

INDEMNIFICATION AGREEMENT

Exhibit 10.5 INDEMNIFICATION AGREEMENT This Indemnification Agreement (“Agreement”) is made as of [●] by and between SIGA Technologies, Inc., a Delaware corporation (the “Company”), and [NAME], a [director and an officer] of the Company (“Indemnitee”). This Agreement supersedes and replaces any and all previous Agreements between the Company and Indemnitee covering indemnification and advancement.

August 1, 2024 EX-10.4

SIGA Technologies, Inc. Restricted Stock Unit Grant Agreement (Directors)

Exhibit 10.4 SIGA Technologies, Inc. Restricted Stock Unit Grant Agreement (Directors) THIS AGREEMENT, made as of the [●] day of June 2024, between SIGA Technologies, Inc. (the “Company”), and [NAME] (the “Participant”). WHEREAS, the Company has adopted and maintains the SIGA Technologies, Inc. 2010 Stock Incentive Plan, as amended (the “Plan”), to establish a flexible vehicle through which the Co

August 1, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended June 30, 2024 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-2304

July 19, 2024 EX-99.1

SIGA Announces U.S. Government Procurement Order of

Exhibit 99.1 SIGA Announces U.S. Government Procurement Order of $113 Million for Oral TPOXX® Exercise of Procurement Option under Current Contract Reflects Continuing Action to Enhance Orthopoxvirus Preparedness NEW YORK (GLOBE NEWSWIRE) - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today announced that the U.S. Department of Health and Human Services

July 19, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 19, 2024 SIGA TECHNOLOGIES, INC.

June 13, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 13, 2024 (June 11, 2024) SIGA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 13, 2024 (June 11, 2024) SIGA TECHNOLOGIES, INC.

May 7, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 7, 2024 SIGA TECHNOLOGIES, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 7, 2024 SIGA TECHNOLOGIES, INC.

May 7, 2024 EX-10.3

AMENDMENT #1 TO THE PROMOTION AGREEMENT

Exhibit 10.3 EXECUTION VERSION AMENDMENT #1 TO THE PROMOTION AGREEMENT This AMENDMENT #1 TO THE PROMOTION AGREEMENT (“Amendment No. 1”) is entered into and made effective as of September 10, 2020 (the “Amendment No. 1 Effective Date”) between SIGA Technologies, Inc., a Delaware corporation, having an address at 31 East 62nd Street, New York, NY 10065 (“SIGA”), and Meridian Medical Technologies, In

May 7, 2024 EX-10.2

EMPLOYMENT AGREEMENT

Exhibit 10.2 EXECUTION VERSION EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT (the “Agreement”) is entered into as of February 26, 2024, between SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Larry Miller (“Executive”). WHEREAS, the Company and Executive desire to enter into an employment agreement providing for Executive to become the General Counsel of the Company and setti

May 7, 2024 EX-10.6

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY “[***],” HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRATANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT #2 TO THE PROMOTION AGREEMENT

Exhibit 10.6 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY “[***],” HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRATANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT #2 TO THE PROMOTION AGREEMENT This AMENDMENT #2 TO THE PROMOTION AGREEMENT (this “Amendment No. 2”) is entered into as of March 27, 2024, between SIGA TECHNOLOGIES, INC., a Delaware

May 7, 2024 EX-10.5

[Signature Page Follows]

Exhibit 10.5 March 26, 2024 Meridian Medical Technologies, LLC 6350 Stevens Forest Road, Suite 301 Columbia, Maryland 21046 Attention: General Manager Re: Letter Amendment to Promotion Agreement To Whom It May Concern: Reference is hereby made to that certain Promotion Agreement, dated as of May 31, 2019 (as amended by Amendment No. 1, dated as of September 10, 2020, and the Letter Amendment, date

May 7, 2024 EX-10.4

[Signature Page Follows]

Exhibit 10.4 February 28, 2024 Meridian Medical Technologies, LLC 6350 Stevens Forest Road, Suite 301 Columbia, Maryland 21046 Attention: General Manager Re: Letter Amendment to Promotion Agreement To Whom It May Concern: Reference is hereby made to that certain Promotion Agreement, dated as of May 31, 2019 (as amended prior to the date hereof, the “Agreement”), by and between SIGA Technologies, I

May 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended March 31, 2024 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-230

May 7, 2024 EX-99.1

SIGA Reports Financial Results for Three Months Ended March 31, 2024

Exhibit 99.1 SIGA Reports Financial Results for Three Months Ended March 31, 2024 • Generated Product Sales of $24 Million and Pre-tax Operating Income of $11 Million • Corporate Update Conference Call Today at 4:30 PM ET NEW YORK, May 7, 2024 - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today reported financial results for the three months ended Marc

April 26, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy St

April 26, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ D

April 1, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 1, 2024 (March 27, 2024) SIG

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 1, 2024 (March 27, 2024) SIGA TECHNOLOGIES, INC.

March 12, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2023 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-23047 SI

March 12, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 12, 2024 SIGA TECHNOLOGIES, INC.

March 12, 2024 EX-10.NNN

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10(nnn) CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

March 12, 2024 EX-97.1

SIGA TECHNOLOGIES, INC. CLAWBACK POLICY

Exhibit 97.1 SIGA TECHNOLOGIES, INC. CLAWBACK POLICY The Compensation Committee (the “Committee”) of the Board of Directors (the “Board”) of SIGA Technologies, Inc. (the “Company”) believes that it is appropriate for the Company to adopt this Clawback Policy (the “Policy”) to be applied to the Executive Officers of the Company and adopts this Policy November 15, 2023 to be effective as of the Effe

March 12, 2024 EX-99.1

SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2023

Exhibit 99.1 SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2023 • Increased Product Sales to $131 Million in 2023 • Grew Pre-tax Operating Income to $84 Million in 2023 • Declared Today a Special Cash Dividend of $0.60 per Share • Corporate Update Conference Call Today at 4:30 PM ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmac

March 12, 2024 EX-10.MMM

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10(mmm) CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

January 22, 2024 EX-99.1

SIGA Announces Appointment of Diem Nguyen, Ph.D., MBA, as New Chief Executive Officer

Exhibit 99.1 SIGA Announces Appointment of Diem Nguyen, Ph.D., MBA, as New Chief Executive Officer January 22, 2024 at 7:30 AM EST NEW YORK, Jan. 22, 2024 (GLOBE NEWSWIRE) - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, today announced that Diem Nguyen, Ph.D., will join the Company as chief executive officer (CEO), e

January 22, 2024 EX-10.1

EMPLOYMENT AGREEMENT

Exhibit 10.1 EXECUTION VERSION EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT (the “Agreement”) is entered into as of January 19, 2024, between SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Diem Nguyen (“Executive”). WHEREAS, the Company and Executive desire to enter into an employment agreement providing for Executive to become the Chief Executive Officer of the Company set

January 22, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 22, 2024 (January 16, 2024

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 22, 2024 (January 16, 2024) SIGA TECHNOLOGIES, INC.

January 2, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 2, 2024 (January 1, 2024)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 2, 2024 (January 1, 2024) SIGA TECHNOLOGIES, INC.

January 2, 2024 EX-10.1

AMENDMENT TO AMENDED & RESTATED TRANSITION AGREEMENT

Exhibit 10.1 AMENDMENT TO AMENDED & RESTATED TRANSITION AGREEMENT This amendment to the Amended and Restated Transition Agreement (the “Amendment”) is made and entered into on this January 1, 2024, by and between SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Phillip Louis Gomez, III (the “Executive” and, together with the Company, the “Parties”). WHEREAS, the Parties previou

November 7, 2023 EX-10.1

EMPLOYMENT AGREEMENT

Exhibit 10.1 EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT (the “Agreement”) is entered into as of July 26, 2023, between SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Dr. Jay K. Varma, M.D. (“Executive”). WHEREAS, Executive currently serves as a member of the Board of Directors of the Company (the “Board”); WHEREAS, the Company and Executive desire to enter into an employm

November 7, 2023 EX-10.2

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.2 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 2 2. AMENDMENT/MODIFICATION NO. P00024 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable) ASPR-22-00229 6. ISSUED BY HHS/OS/ASPR/BARDA 330 Independence Ave., S.W. Room 640-G Washington DC 20201 CODE HHS/OS/ASPR/BARDA 7. ADMINISTERED BY (If other than Item

November 7, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended September 30, 2023 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0

November 7, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 7, 2023 SIGA TECHNOLOGIES, INC.

November 7, 2023 EX-99.1

SIGA Reports Financial Results for Three and Nine Months Ended September 30, 2023 - In Third Quarter, SIGA Received U.S. Government Orders for Approximately $113 Million of Oral TPOXX and $25 Million of IV TPOXX® – - In October, Joint Procurement Fra

Exhibit 99.1 SIGA Reports Financial Results for Three and Nine Months Ended September 30, 2023 - In Third Quarter, SIGA Received U.S. Government Orders for Approximately $113 Million of Oral TPOXX and $25 Million of IV TPOXX® – - In October, Joint Procurement Framework Contract was signed by European Commission with Anticipated Initial Orders by Participating Countries of Approximately $18 Million

September 6, 2023 EX-99.1

SIGA Technologies Names Dr. Jay K. Varma as EVP and Chief Medical Officer

Exhibit 99.1 SIGA Technologies Names Dr. Jay K. Varma as EVP and Chief Medical Officer NEW YORK, September 6, 2023 (GLOBE NEWSWIRE) - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, today announced that Dr. Jay K. Varma has joined SIGA as Executive Vice President and Chief Medical Officer (CMO). He will also continue t

September 6, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 6, 2023 SIGA TECHNOLOGIE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 6, 2023 SIGA TECHNOLOGIES, INC.

August 8, 2023 EX-10.2

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.2 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 8 2. AMENDMENT/MODIFICATION NO. P00013 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. See

August 8, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 8, 2023 SIGA TECHNOLOGIES, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 8, 2023 SIGA TECHNOLOGIES, INC.

August 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended June 30, 2023 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-2304

August 8, 2023 EX-99.1

SIGA Reports Financial Results for Three and Six Months Ended June 30, 2023 - In July, SIGA Received U.S. Government Orders for Approximately $113 Million of Oral TPOXX and $25 Million of IV TPOXX® -

Exhibit 99.1 SIGA Reports Financial Results for Three and Six Months Ended June 30, 2023 - In July, SIGA Received U.S. Government Orders for Approximately $113 Million of Oral TPOXX and $25 Million of IV TPOXX® - - Corporate Update Conference Call Today at 4:30 PM ET August 8, 2023, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, toda

August 8, 2023 EX-10.1

CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.1 CERTAIN INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. Dr. Dennis E. Hruby [***] Dear Dr. Hruby: This letter sets forth a proposal for the amendment of your employment agreement with SIGA Technologies, Inc., dated as of January 22, 2007, as amended

July 28, 2023 EX-99.1

SIGA Announces U.S. Government Procurement Orders of Approximately $138 Million for Oral and IV TPOXX®

EXHIBIT 99.1 SIGA Announces U.S. Government Procurement Orders of Approximately $138 Million for Oral and IV TPOXX® Exercise of Procurement Options of Approximately $113 Million for Oral TPOXX and Approximately $25 Million for IV TPOXX under Current Contract reflects continuing global action to enhance smallpox preparedness NEW YORK, (GLOBE NEWSWIRE) - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA)

July 28, 2023 EX-10.1

AMENDED & RESTATED TRANSITION AGREEMENT

EXHIBIT 10.1 AMENDED & RESTATED TRANSITION AGREEMENT THIS AMENDED & RESTATED TRANSITION AGREEMENT (the “Agreement”), dated July 26, 2023, is entered into by SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Phillip Louis Gomez, III (“Executive”). Capitalized terms used and not otherwise defined herein shall have the meaning set forth in the Employment Agreement, dated October 13

July 28, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 26, 2023 SIGA TECHNOLOGIES, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 26, 2023 SIGA TECHNOLOGIES, INC.

July 28, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 27, 2023 SIGA TECHNOLOGIES, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 27, 2023 SIGA TECHNOLOGIES, INC.

June 15, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 13, 2023 SIGA TECHNOLOGIES, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 13, 2023 SIGA TECHNOLOGIES, INC.

May 4, 2023 EX-99.1

SIGA Reports Financial Results for Three Months Ended March 31, 2023 - Corporate Update Conference Call Today at 4:30 PM ET -

Exhibit 99.1 SIGA Reports Financial Results for Three Months Ended March 31, 2023 - Corporate Update Conference Call Today at 4:30 PM ET - May 4, 2023, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today reported financial results for the three months ended March 31, 2023. “First quarter product revenues primarily reflect the sale o

May 4, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 4, 2023 SIGA TECHNOLOGIES INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 4, 2023 SIGA TECHNOLOGIES INC.

May 4, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 4, 2023 SIGA TECHNOLOGIES, INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 4, 2023 SIGA TECHNOLOGIES, INC.

May 4, 2023 EX-99.1

SIGA Declares Special Cash Dividend of $0.45 Per Share

Exhibit 99.1 SIGA Declares Special Cash Dividend of $0.45 Per Share May 4, 2023, 7:30 am ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today announced that the Board of Directors declared a special cash dividend of $0.45 per share on the common stock of the Company. The special cash dividend is payable on June 1, 2023 to shareholders of rec

May 4, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended March 31, 2023 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-230

April 26, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-

March 2, 2023 EX-99.1

SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2022 - Approximately $71 Million of International Product Sales in 2022 – - Corporate Update Conference Call Today at 4:30 PM ET -

Exhibit 99.1 SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2022 - Approximately $71 Million of International Product Sales in 2022 – - Corporate Update Conference Call Today at 4:30 PM ET - March 2, 2023, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today reported financial results for the three and

March 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 2, 2023 SIGA TECHNOLOGIES, IN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 2, 2023 SIGA TECHNOLOGIES, INC.

March 2, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2022 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-23047 SI

February 14, 2023 SC 13G/A

SIGA / SIGA Technologies, Inc. / D. E. SHAW & CO, L.P. - SC 13G/A Passive Investment

SC 13G/A 1 tm235349-16sc13g.htm SC 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Amendment No. 1) Under the Securities Exchange Act of 1934 SIGA Technologies, Inc. (Name of Issuer) Common stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the follo

February 14, 2023 EX-99.2

JOINT FILING AGREEMENT

EX-99.2 3 tm235349-16ex2.htm EXHIBIT 2 Exhibit 2 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, each of the undersigned Reporting Persons hereby agrees to the joint filing, along with all other such Reporting Persons, on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common

February 14, 2023 EX-99.1

POWER OF ATTORNEY FOR CERTAIN REGULATORY FILINGS INCLUDING CERTAIN FILINGS UNDER THE SECURITIES EXCHANGE ACT OF 1934 AND THE INVESTMENT ADVISERS ACT OF 1940

EX-99.1 2 tm235349-16ex1.htm EXHIBIT 1 Exhibit 1 POWER OF ATTORNEY FOR CERTAIN REGULATORY FILINGS INCLUDING CERTAIN FILINGS UNDER THE SECURITIES EXCHANGE ACT OF 1934 AND THE INVESTMENT ADVISERS ACT OF 1940 I, David E. Shaw, hereby make, constitute, and appoint each of: Edward Fishman, Julius Gaudio, Martin Lebwohl, Maximilian Stone, David Sweet, Nathan Thomas, and Eric Wepsic, acting individually,

January 17, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 13, 2023 SIGA TECHNOLOGIES, INC.

January 17, 2023 EX-10.1

TRANSITION AGREEMENT

Exhibit 10.1 EXECUTION VERSION TRANSITION AGREEMENT THIS TRANSITION AGREEMENT (the “Agreement”), dated January 13, 2023 is entered into by SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Phillip Louis Gomez, III (“Executive”). Capitalized terms used and not otherwise defined herein shall have the meaning set forth in the Employment Agreement, dated October 13, 2016, by and bet

January 17, 2023 EX-99.1

SIGA Technologies Announces Planned Retirement of CEO Phil Gomez in 2023

Exhibit 99.1 SIGA Technologies Announces Planned Retirement of CEO Phil Gomez in 2023 SIGA Board of Directors has initiated search for new CEO; Dr. Gomez expected to remain in position as CEO until the search is completed to support the transition to a new CEO in 2023. NEW YORK, Jan. 17, 2023 (GLOBE NEWSWIRE) - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical compan

November 14, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 10, 2022 SIGA TECHNOLOGIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 10, 2022 SIGA TECHNOLOGIES, INC.

November 3, 2022 EX-10.6

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.6 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 2 2. AMENDMENT/MODIFICATION NO. P00022 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. OS302885 5. PROJECT NO. (If applicable) 6. ISSUED BY CODE ASPR-BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 20201 8. NAME AN

November 3, 2022 EX-10.2

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.2 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 2 2. AMENDMENT/MODIFICATION NO. P00010 3. EFFECTIVE DATE See Block 16C 4.REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable) ASPR-21-02282 6. ISSUED BY CODE ASPR-BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 20201 8. NAM

November 3, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 3, 2022 SIGA TECHNOLOGIES,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 3, 2022 SIGA TECHNOLOGIES, INC.

November 3, 2022 EX-10.4

CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.4 CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 5 2. AMENDMENT/MODIFICATION NO. P00012 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO

November 3, 2022 EX-10.5

CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.5 CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 3 2. AMENDMENT/MODIFICATION NO. P00021 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO

November 3, 2022 EX-99.1

SIGA Reports Financial Results for Three and Nine Months Ended September 30, 2022 - Approximately $61 Million of International Sales in the Third Quarter –

Exhibit 99.1 SIGA Reports Financial Results for Three and Nine Months Ended September 30, 2022 - Approximately $61 Million of International Sales in the Third Quarter – - Corporate Update Conference Call Today at 4:30 PM ET November 3, 2022, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today reported financial results for the three

November 3, 2022 EX-10.3

PAGE OF PAGES

Exhibit 10.3 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 2 2. AMENDMENT/MODIFICATION NO. P00011 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable) 6. ISSUED BY CODE ASPR-BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 20201 8. NAME AND ADDRESS

November 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended September 30, 2022 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0

November 3, 2022 EX-10.1

CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.1 CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 2 2. AMENDMENT/MODIFICATION NO. P00009 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO

August 9, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 9, 2022 SIGA TECHNOLOGIES, INC.

August 9, 2022 EX-99.0

SIGA Announces BARDA Exercise of Procurement Options Valued at Approximately $26 Million for IV TPOXX® – IV TPOXX is an Important Option for Those Unable to Swallow – – Option to Fund Post-Marketing Field Study for IV TPOXX also Exercised –

Exhibit 99.1 SIGA Announces BARDA Exercise of Procurement Options Valued at Approximately $26 Million for IV TPOXX? ? IV TPOXX is an Important Option for Those Unable to Swallow ? ? Option to Fund Post-Marketing Field Study for IV TPOXX also Exercised ? NEW YORK, Aug. 9, 2022 (GLOBE NEWSWIRE) - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today announce

August 4, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 31, 2022 SIGA TECHNOLOGIES, INC.

August 4, 2022 EX-99.1

SIGA Reports Financial Results for Three and Six Months Ended June 30, 2022 - Approximately $9 Million of Product Sales in the Second Quarter, including First Oral TPOXX® Sale to the U.S. Department of Defense and Approximately $5 Million of Internat

Exhibit 99.1 SIGA Reports Financial Results for Three and Six Months Ended June 30, 2022 - Approximately $9 Million of Product Sales in the Second Quarter, including First Oral TPOXX? Sale to the U.S. Department of Defense and Approximately $5 Million of International Sales ? - Received Approximately $60 Million of International Orders for Oral TPOXX? Year to Date, from Ten Jurisdictions under New

August 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended June 30, 2022 Or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-2304

July 12, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 12, 2022 SIGA TECHNOLOGIES, INC.

July 12, 2022 EX-99.1

SIGA Announces Approximately $28 Million of International Procurement Orders for Oral TPOXX® (Tecovirimat)

Exhibit 99.1 SIGA Announces Approximately $28 Million of International Procurement Orders for Oral TPOXX? (Tecovirimat) - Approximately $26 Million of Orders Received from Canada under Existing Procurement Contracts ? - Approximately $2 Million of Orders Received from Two New Jurisdictions - NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused

June 24, 2022 SC 13G

SIGA / SIGA Technologies, Inc. / D. E. SHAW & CO, L.P. - SC 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 SIGA Technologies, Inc. (Name of Issuer) Common stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) June 14, 2022 (Date of Event Which Requires Filing of this Statement) Check the following box to designate the rule pursuant to which the Schedule i

June 24, 2022 EX-99.2

JOINT FILING AGREEMENT

Exhibit 2 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, each of the undersigned Reporting Persons hereby agrees to the joint filing, along with all other such Reporting Persons, on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common stock, par value $0.

June 24, 2022 EX-99.1

POWER OF ATTORNEY FOR CERTAIN REGULATORY FILINGS INCLUDING CERTAIN FILINGS UNDER THE SECURITIES EXCHANGE ACT OF 1934 AND THE INVESTMENT ADVISERS ACT OF 1940

EX-99.1 2 tm2219342d1ex1.htm EXHIBIT 1 Exhibit 1 POWER OF ATTORNEY FOR CERTAIN REGULATORY FILINGS INCLUDING CERTAIN FILINGS UNDER THE SECURITIES EXCHANGE ACT OF 1934 AND THE INVESTMENT ADVISERS ACT OF 1940 I, David E. Shaw, hereby make, constitute, and appoint each of: Edward Fishman, Julius Gaudio, Martin Lebwohl, Maximilian Stone, David Sweet, Nathan Thomas, and Eric Wepsic, acting individually,

June 16, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 14, 2022 SIGA TECHNOLOGIES, INC.

June 16, 2022 EX-3.1

AMENDED AND RESTATED CERTIFICATE OF INCORPORATION SIGA TECHNOLOGIES, INC. Pursuant to Sections 242 and 245 of the General Corporation Law of the State of Delaware

Exhibit 3.1 AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF SIGA TECHNOLOGIES, INC. Pursuant to Sections 242 and 245 of the General Corporation Law of the State of Delaware The undersigned, Daniel J. Luckshire, certifies that he is the Executive Vice President and Chief Financial Officer of SIGA Technologies, Inc., a corporation organized and existing under the laws of the State of Delaware (

May 5, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended March 31, 2022 Or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-230

May 5, 2022 EX-99.1

SIGA Declares Special Dividend of $0.45 Per Share

Exhibit 99.1 SIGA Declares Special Dividend of $0.45 Per Share May 5, 2022, 7:30 am ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today announced that the Board of Directors declared a special dividend of $0.45 per share on the common stock of the Company. The special dividend is payable on June 2, 2022 to shareholders of record at the clos

May 5, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 5, 2022 SIGA TECHNOLOGIES, INC.

May 5, 2022 EX-99.1

SIGA Reports Financial Results for Three Months Ended March 31, 2022 - First Sale of Intravenous (IV) TPOXX® to U.S. Government under the 19C BARDA Contract – - Contract with a New International Jurisdiction for an Initial Order of Approximately $3 M

Exhibit 99.1 SIGA Reports Financial Results for Three Months Ended March 31, 2022 - First Sale of Intravenous (IV) TPOXX? to U.S. Government under the 19C BARDA Contract ? - Contract with a New International Jurisdiction for an Initial Order of Approximately $3 Million of Oral TPOXX - - Corporate Update Conference Call Today at 4:30 PM ET - May 5, 2022, 4:05 pm ET NEW YORK - SIGA Technologies, Inc

May 5, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 5, 2022 SIGA TECHNOLOGIES, INC.

May 5, 2022 EX-10.1

CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

Exhibit 10.1 CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY "[***]," HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 4 2. AMENDMENT/MODIFICATION NO. P00023 3. EFFECTIVE DATE 01/14/2022 4. REQUISITION/PURCHASE REQ. NO. O

April 27, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ? ? ? Filed by a Party other than the Registrant ?? Check the appropriate box: ?? ? ? Preliminary Proxy Statement ?? ? ? Confidential, for Use of the Commission Only (as permitted

April 13, 2022 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934

PRE 14A 1 ny20002649x1pre14a.htm PRE 14A TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box: ☒ Preliminary Proxy Statement  ☐ Confidential, for Use of the Co

March 24, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 18, 2022 SIGA TECHNOLOGIES, INC.

March 3, 2022 EX-10.UU

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10(uu) AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 2 2. AMENDMENT/MODIFICATION NO. P00008 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable) ASPR-21-02282 6. ISSUED BY CODE ASPR?BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 20201 8.

March 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 3, 2022 SIGA TECHNOLOGIES, INC.

March 3, 2022 EX-10.VV

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10(vv) AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 2 2. AMENDMENT/MODIFICATION NO. P00020 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable) 6. ISSUED BY CODE ASPR?BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 20201 8. NAME AND ADDRE

March 3, 2022 EX-10.WW

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10(ww) AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 2 2. AMENDMENT/MODIFICATION NO. P00022 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable) ASPR-20-02608 6. ISSUED BY CODE HHS/OS/ASPR/BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR?BARDA02 HHS/OS/ASPR/BARDA 330 Independence Ave., S.W. Room 64

March 3, 2022 EX-10.TT

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10(tt) Certain information marked with ?[***]? has been excluded from this exhibit because such information both (i) is not material and (ii) is the type that the registrant treats as private or confidential.

March 3, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ? Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2021 Or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-23047 SI

March 3, 2022 EX-99.1

SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2021 - Approximately $113 Million of U.S. Product Sales in 2021 – - Approximately $13 Million of International Product Sales in 2021 – - Corporate Update Conference Call To

Exhibit 99.1 SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2021 - Approximately $113 Million of U.S. Product Sales in 2021 ? - Approximately $13 Million of International Product Sales in 2021 ? - Corporate Update Conference Call Today at 4:30 PM ET - March 3, 2022, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical

December 15, 2021 EX-3.1

AMENDED AND RESTATED SIGA TECHNOLOGIES, INC. A DELAWARE CORPORATION As in effect on December 9, 2021 ARTICLE I

Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF SIGA TECHNOLOGIES, INC. A DELAWARE CORPORATION As in effect on December 9, 2021 ARTICLE I OFFICES The registered office shall be in the City of Wilmington, County of New Castle, State of Delaware. The Corporation may also have offices at such other places both within and without the State of Delaware as the board of directors (the ?Board?) may from time

December 15, 2021 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 9, 2021 SIGA TECHNOLOGIES, INC.

November 22, 2021 SC 13D/A

SIGA / SIGA Technologies, Inc. / ESOPUS CREEK VALUE SERIES FUND LP - SERIES A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (RULE 13D - 101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a) (Amendment No. 2)* SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) Martin Sklar Kleinberg

November 22, 2021 EX-99.1

SCHEDULE A Transactions in the Common Stock of the Issuer by Reporting Persons During the Past 60 Days

SCHEDULE A Transactions in the Common Stock of the Issuer by Reporting Persons During the Past 60 Days Date Buy/Sell Security Approximate Price Per Share1 Amount of Shares Bought/(Sold) Hutch Master Fund Ltd. 09/20/2021 BUY Common Stock $6.64 2,500 1 Including any brokerage fees

November 4, 2021 EX-99.1

SIGA Reports Financial Results for Third Quarter and Nine Months Ended September 30, 2021 - Up to Approximately $113 Million of Oral TPOXX® Targeted for Delivery to the U.S. Government in the Fourth Quarter - - Approximately $13 Million of Internatio

Exhibit 99.1 SIGA Reports Financial Results for Third Quarter and Nine Months Ended September 30, 2021 - Up to Approximately $113 Million of Oral TPOXX? Targeted for Delivery to the U.S. Government in the Fourth Quarter - - Approximately $13 Million of International Sales for the First Nine Months of 2021 - - Corporate Update Conference Call Today at 4:30 PM ET November 4, 2021, 4:05 pm ET NEW YOR

November 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended September 30, 2021 Or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0

November 4, 2021 EX-10.1

PAGE OF PAGES

Exhibit 10.1 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 3 2.AMENDMENT/MODIFICATION NO. P00007 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. OS281784 5. PROJECT NO. (if applicable) ASPR-21-02282 6. ISSUED BY CODE ASPR-BARDA 7. ADMINISTERED BY (if other than Item 6) CODE ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 202

November 4, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 4, 2021 SIGA TECHNOLOGIES, INC.

September 17, 2021 SC 13D/A

SIGA / SIGA Technologies, Inc. / MacAndrews & Forbes Inc. - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 15) SIGA Technologies, Inc. (Name of issuer) Common Stock, par value $0.0001 per share (Title of class of securities) 826917-10-6 (CUSIP number) Shiri Ben-Yishai Executive Vice President and Chief Legal Officer MacAndrews & Forbes Incorporated 31 East 62nd S

September 15, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 14, 2021 SIGA TECHNOLOGIES, INC.

September 9, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 7, 2021 SIGA TECHNOLOGIES, INC.

August 17, 2021 SC 13D/A

SIGA / SIGA Technologies, Inc. / ESOPUS CREEK VALUE SERIES FUND LP - SERIES A Activist Investment

SC 13D/A 1 siga13da1-081721.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (RULE 13D - 101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a) (Amendment No. 1)* SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSI

August 17, 2021 SC 13D/A

SIGA / SIGA Technologies, Inc. / ESOPUS CREEK VALUE SERIES FUND LP - SERIES A - EXHIBIT 99.3 Activist Investment

begin 644 siga13da1-081721.pdf M)5!$1BTQ+C,-,2 P(&]B:@T\/"]4>7!E("]83V)J96-T("]3=6)T>7!E("]) M;6%G92 O3F%M92 O26TQ("]7:61T:" Q-S P("](96EG:'0@,C(P," O3&5N M9W1H(#,X-#,S-B]#;VQO'1H<'" D+B<@(BPC'!PH-RDL,#$T-#0?)SD].#(\+C,T,O; $,! M"0D)# L,& T-&#(A'"$R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R M,C(R,C(R,C(R,C(R,C(R,C(R,O !$(")@&I ,!(@ "$0$#$0'Q ? ! M!0$! 0$! 0 0(#! 4&!P@)"@OQ "U$ " 0,# @0#!04$! M 7T! @

August 5, 2021 EX-99.1

SIGA Reports Financial Results for Three and Six Months Ended June 30, 2021 - Approximately $7 Million in International Sales of Oral TPOXX® in the Second Quarter - - Authorization of Additional $50 Million Share Repurchase Program -

Exhibit 99.1 SIGA Reports Financial Results for Three and Six Months Ended June 30, 2021 - Approximately $7 Million in International Sales of Oral TPOXX? in the Second Quarter - - Authorization of Additional $50 Million Share Repurchase Program - - Corporate Update Conference Call Today at 4:30 PM ET August 5, 2021, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-

August 5, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 5, 2021 SIGA TECHNOLOGIES, INC.

August 5, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended June 30, 2021 Or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-2304

June 17, 2021 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 15, 2021 SIGA TECHNOLOGIES, INC.

May 6, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 6, 2021 SIGA TECHNOLOGIES, INC.

May 6, 2021 EX-99.1

SIGA Reports Financial Results for Three Months Ended March 31, 2021 - Approximately $3 Million in International Sales of Oral TPOXX® in the First Quarter – - Approximately $7 Million in International Sales of Oral TPOXX® in April –

Exhibit 99.1 SIGA Reports Financial Results for Three Months Ended March 31, 2021 - Approximately $3 Million in International Sales of Oral TPOXX? in the First Quarter ? - Approximately $7 Million in International Sales of Oral TPOXX? in April ? - Corporate Update Conference Call Today at 4:30 PM ET May 6, 2021, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stag

May 6, 2021 10-Q

Quarterly Report - FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended March 31, 2021 Or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-230

April 27, 2021 DEF 14A

- DEF 14A

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION ? PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ????Filed by a Party other than the Registrant ??? Check the appropriate box: ?? Preliminary Proxy Statement ?? Confidential, for Use of the Commission Only (as permitted by Rule

March 4, 2021 10-K

Annual Report - FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ? Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2020 Or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-23047 SI

March 4, 2021 EX-99.1

SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2020 - Approximately 363,000 Courses of Oral TPOXX® Delivered to U.S. Government in 2020 – - International Contracts for the Purchase of up to Approximately $47 Million of

Exhibit 99.1 SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2020 - Approximately 363,000 Courses of Oral TPOXX? Delivered to U.S. Government in 2020 ? - International Contracts for the Purchase of up to Approximately $47 Million of Oral TPOXX? Since April 2020 ? - Corporate Update Conference Call Today at 4:30 PM ET - March 4, 2021, 4:05 pm ET NEW YORK - SIGA Technol

March 4, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 4, 2021 SIGA TECHNOLOGIES, INC.

February 23, 2021 SC 13D

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (RULE 13D - 101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a) (Amendment No. ___)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (RULE 13D - 101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a) (Amendment No. )* SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) Martin Sklar Kleinberg,

February 23, 2021 EX-99.2

JOINT FILING AGREEMENT

EXHIBIT 99.2 JOINT FILING AGREEMENT The undersigned hereby agree that the statement on Schedule 13D with respect to the Common stock, par value $0.0001 per share, of SIGA Technologies, Inc. dated as of the date hereof is, and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rul

February 23, 2021 SC 13D

EXHIBIT 99.1

SIGA Technologies Proposed Recapitalization February 2021 FOR DISCUSSION PURPOSES ONL Y .

January 22, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 20, 2021 SIGA TECHNOLOGIES, INC.

January 22, 2021 EX-10.1

THIRD AMENDED AND RESTATED EMPLOYMENT AGREEMENT

Exhibit 10.1 THIRD AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AMENDED AND RESTATED EMPLOYMENT AGREEMENT (the “Agreement”), made in New York, New York as of January 20, 2021 (the “Effective Date”), between SIGA Technologies, Inc., a Delaware corporation (the “Company”), and Robin E. Abrams (“Executive”). WHEREAS, the Company and the Executive are parties to that certain Employment Agreement mad

January 13, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 13, 2021 SIGA TECHNOLOGIES, INC.

January 13, 2021 EX-99.1

SIGA Announces Public Health Agency of Canada Contract Award to Purchase Up To Approximately $33 Million of Oral

Exhibit 99.1 SIGA Announces Public Health Agency of Canada Contract Award to Purchase Up To Approximately $33 Million of Oral TPOXX® Second Contract by a Canadian Governmental Agency for the Procurement of Oral TPOXX January 13, 2021 NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, today announced that the Pu

January 4, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G (RULE 13d - 102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b) (Amendment No. 1)* SIGA Technol

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G (RULE 13d - 102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b) (Amendment No. 1)* SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) December 31, 2020 (Date

December 11, 2020 EX-10.1

THIRD AMENDED AND RESTATED EMPLOYMENT AGREEMENT

Exhibit 10.1 Execution Version THIRD AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS THIRD AMENDED AND RESTATED AGREEMENT (the "Agreement"), made in New York, New York as of December 10, 2020 between SIGA Technologies, Inc., a Delaware corporation (the "Company"), and Dr. Dennis E. Hruby ("Executive"). WHEREAS, the Company and Executive entered into an Employment Agreement dated January 22, 2007 (t

December 11, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 10, 2020 SIGA TECHNOLOGIES INC.

November 5, 2020 10-Q

Quarterly Report - FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended September 30, 2020 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0

November 5, 2020 EX-10.2

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.2 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 4 2. AMENDMENT/MODIFICATION NO. P00019 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable) 6. ISSUED BYCODE ASPR-BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 20201 8. NAME AND ADDRESS

November 5, 2020 EX-10.1

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.1 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF 1 PAGES 4 2. AMENDMENT/MODIFICATION NO. P00021 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. OS260888 5. PROJECT NO. (if applicable) ASPR-20-02608 6. ISSUED BYCODE HHS/OS/ASPR/BARDA 7. ADMINISTERED BY (if other than item 6) CODE ASPR-BARDA02 HHS/OS/ASPR/BARDA 330 Independence Ave., S.W. R

November 5, 2020 EX-99.1

SIGA Reports Financial Results for Three and Nine Months Ended September 30, 2020 - Third Quarter includes Delivery of Approximately 134,000 Courses of TPOXX® to U.S. Government – - In October, the Public Health Agency of Canada Announced its Intent

Exhibit 99.1 SIGA Reports Financial Results for Three and Nine Months Ended September 30, 2020 - Third Quarter includes Delivery of Approximately 134,000 Courses of TPOXX® to U.S. Government – - In October, the Public Health Agency of Canada Announced its Intent to Purchase up to 33,300 Courses of Oral TPOXX® – - Corporate Update Conference Call Today at 4:30 PM ET - November 5, 2020, 4:05 pm ET N

November 5, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 5, 2020 SIGA TECHNOLOGIES, INC.

October 2, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 30, 2020 SIGA TECHNOLOGIES, INC.

August 6, 2020 EX-99.1

SIGA Technologies, Inc. Reports Financial Results for Three and Six Months Ended June 30, 2020 - Second Quarter includes Deliveries to SNS and First International Delivery -

Exhibit 99.1 SIGA Technologies, Inc. Reports Financial Results for Three and Six Months Ended June 30, 2020 - Second Quarter includes Deliveries to SNS and First International Delivery - - Corporate Update Conference Call Today at 4:30 PM ET - August 6, 2020, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health securit

August 6, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 6, 2020 SIGA TECHNOLOGIES, INC.

August 6, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 6, 2020 SIGA TECHNOLOGIES, INC.

August 6, 2020 EX-10.1

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

EX-10.1 2 ex194496.htm EXHIBIT 10.1 Exhibit 10.1 Certain portions of this exhibit have been omitted pursuant to Rule 601(b)(10) of Regulation S-K. The omitted information is (i) not material and (ii) would likely cause competitive harm to the registrant if publicly disclosed. Information that has been omitted has been noted in this document with a placeholder identified by the term “{redacted}”. A

August 6, 2020 10-Q

Quarterly Report - FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended June 30, 2020 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-2304

June 26, 2020 CORRESP

-

June 26, 2020 Christine Allen Torney Securities and Exchange Commission Division of Corporation Finance Office of Life Science 100 F Street, N.

June 26, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 23, 2020 SIGA TECHNOLOGIES, INC.

June 18, 2020 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 16, 2020 SIGA TECHNOLOGIES, INC.

June 1, 2020 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a‑6(e)(2)) ☐ Definitive Proxy State

May 14, 2020 SC 13D/A

SIGAQ / SIGA Technologies, Inc. / Esopus Creek Value Series Fund Lp - Series A Activist Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) (Amendment No.

May 14, 2020 SC 13G

SIGAQ / SIGA Technologies, Inc. / Esopus Creek Value Series Fund Lp - Series A - MAY 14, 2020 Passive Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G (RULE 13d - 102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b) (Amendment No. )* SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) May 14, 2020 (Date of Ev

May 6, 2020 EX-99.1

SIGA Technologies, Inc. Reports Financial Results for the First Quarter of 2020 - Company Recently Announced Exercise of Contract Options Totaling $101.3 million - - Corporate Update Conference Call Today at 4:30 PM ET -

Exhibit 99.1 SIGA Technologies, Inc. Reports Financial Results for the First Quarter of 2020 - Company Recently Announced Exercise of Contract Options Totaling $101.3 million - - Corporate Update Conference Call Today at 4:30 PM ET - May 6, 2020, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, tod

May 6, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 6, 2020 SIGA TECHNOLOGIES, INC.

May 6, 2020 10-Q

Quarterly Report - FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended March 31, 2020 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-230

May 6, 2020 EX-10.1

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.1 Certain portions of this exhibit have been omitted pursuant to Rule 601(b)(10) of Regulation S-K. The omitted information is (i) not material and (ii) would likely cause competitive harm to the registrant if publicly disclosed. Information that has been omitted has been noted in this document with a placeholder identified by the term “{redacted}”. AMENDMENT OF SOLICITATION/MODIFICATIO

April 29, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 29, 2020 SIGA TECHNOLOGIES, INC.

April 29, 2020 EX-99.1

SIGA Announces BARDA Exercise of Contract Options Valued at $101.3 Million for the Procurement of Oral Deliveries to Maintain National Security Expected to Start in Second Quarter 2020

Exhibit 99.1 SIGA Announces BARDA Exercise of Contract Options Valued at $101.3 Million for the Procurement of Oral TPOXX® Deliveries to Maintain National Security Expected to Start in Second Quarter 2020 April 29, 2020 NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, today announced the exercise of options u

April 28, 2020 DEF 14A

- DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒   Filed by a Party other than the Registrant   ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defi

March 10, 2020 8-K

Termination of a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 9, 2020 SIGA TECHNOLOGIES, INC.

March 6, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 5, 2020 SIGA TECHNOLOGIES, INC.

March 5, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 5, 2020 SIGA TECHNOLOGIES, INC.

March 5, 2020 EX-4.B

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 DESCRIPTION OF CAPITAL STOCK

EXHIBIT 4(b) DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 DESCRIPTION OF CAPITAL STOCK The Amended and Restated Certificate of Incorporation (“Certificate of Incorporation”) of SIGA Technologies, Inc.

March 5, 2020 EX-10.RR

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10(rr) Certain portions of this exhibit have been omitted pursuant to Rule 601(b)(10) of Regulation S-K.

March 5, 2020 EX-99.1

SIGA Technologies, Inc. Reports Financial Results for Fiscal Year 2019 - Announces Expectations for Product Delivery to BARDA - - Announces $50 Million Share Repurchase Program - - Corporate Update Conference Call Today at 4:30 PM ET -

Exhibit 99.1 SIGA Technologies, Inc. Reports Financial Results for Fiscal Year 2019 - Announces Expectations for Product Delivery to BARDA - - Announces $50 Million Share Repurchase Program - - Corporate Update Conference Call Today at 4:30 PM ET - March 5, 2020, 4:05 pm ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health sec

March 5, 2020 EX-10.SS

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10(ss) Certain portions of this exhibit have been omitted pursuant to Rule 601(b)(10) of Regulation S-K.

March 5, 2020 10-K

SIGA / SIGA Technologies, Inc. 10-K - Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) x Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2019 Or o Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-23047 SI

February 25, 2020 EX-99.1

Please see PDF attached for document reference

EX-99.1 2 sigatech13da2-ex993-022420.htm Please see PDF attached for document reference

February 25, 2020 SC 13D/A

SIGAQ / SIGA Technologies, Inc. / Esopus Creek Value Series Fund Lp - Series A Activist Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) (Amendment No.

February 25, 2020 EX-99.1

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February 13, 2020 SC 13D/A

SIGAQ / SIGA Technologies, Inc. / Esopus Creek Value Series Fund Lp - Series A - AMENDMENT NO. 1 TO THE SCHEDULE 13D Activist Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) (Amendment No. 1)1 SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) Martin Sklar, Kleinberg, Kap

February 13, 2020 EX-99.1

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February 13, 2020 EX-99.2

JOINT FILING AGREEMENT

EXHIBIT 99.2 JOINT FILING AGREEMENT The undersigned hereby agree that the statement on Schedule 13D with respect to the Common stock, par value $0.0001 per share, of SIGA Technologies, Inc. dated as of the date hereof is, and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rul

February 13, 2020 EX-99.1

Please see attached pdf.

Please see attached pdf.

February 13, 2020 SC 13D

SIGAQ / SIGA Technologies, Inc. / Esopus Creek Value Series Fund Lp - Series A - FEBRUARY 12, 2020 Activist Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) (Amendment No. )1 SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) Martin Sklar, Kleinberg, Kapl

February 13, 2020 EX-99.1

SCHEDULE A Transactions in the Common Stock of the Issuer by Reporting Persons During the Past 60 Days

SCHEDULE A Transactions in the Common Stock of the Issuer by Reporting Persons During the Past 60 Days Date Buy/Sell Security Approximate Price Per Share1 Amount of Shares Bought/(Sold) Hutch Master Fund Ltd.

February 13, 2020 EX-99.2

JOINT FILING AGREEMENT

EXHIBIT 99.2 JOINT FILING AGREEMENT The undersigned hereby agree that the statement on Schedule 13D with respect to the Common stock, par value $0.0001 per share, of SIGA Technologies, Inc. dated as of the date hereof is, and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rul

January 2, 2020 SC 13G/A

SIGAQ / SIGA Technologies, Inc. / Esopus Creek Value Series Fund Lp - Series A - AMENDMENT NO. 2 TO THE SCHEDULE 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G (RULE 13d - 102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b) (Amendment No. 2)* SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) December 31, 2019 (Date

November 5, 2019 10-Q

SIGA / SIGA Technologies, Inc. 10-Q - Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended September 30, 2019 Or ¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0

November 5, 2019 EX-10.1

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.1 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 5 2. AMENDMENT/MODIFICATION NO P00003 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ NO. OS243619 5. PROJECT NO (If applicable) ASPR-19-03461 6. ISSUED BY CODE ASPR-BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 20201

August 6, 2019 EX-10.2

Continuation Sheet Block 14

Contract No. HHSO100201100023C Modification No. 19 Continuation Sheet Block 14 Page 3 of 4 FUNDS ALLOTTED PRIOR TO MOD #19 $ 36,804,565.90 FUNDS ALLOTTED WITH MOD #19 $ 2,114,660.00 TOTAL FUNDS ALLOTTED TO DATE $ 38,919,225.90 (Changed) CONTRACT EXPIRATION DATE: December 30, 2020 (Unchanged) CLIN 0002 POP 18Feb2018 (Unchanged) CLIN 0003 POP 30Dec2019 (Unchanged) CLIN 0004 POP 30Dec2020 (Unchanged)

August 6, 2019 EX-10.4

FOURTH AMENDMENT TO LOAN AND SECURITY AGREEMENT

Exhibit 10.4 FOURTH AMENDMENT TO LOAN AND SECURITY AGREEMENT This FOURTH AMENDMENT (this “Amendment”) dated as of July 24, 2019 in respect of that certain Loan and Security Agreement dated as of September 2, 2016 (as amended by that First Amendment dated as of September 27, 2016, as further amended by that Second Amendment dated as of June 25, 2018, as further amended by that Third Amendment dated

August 6, 2019 10-Q

SIGA / SIGA Technologies, Inc. 10-Q - Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended June 30, 2019 Or ¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-2304

July 2, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 2, 2019 SIGA TECHNOLOGIES, INC.

June 3, 2019 EX-10.1

PROMOTION AGREEMENT by and between SIGA TECHNOLOGIES, INC. MERIDIAN MEDICAL TECHNOLOGIES, INC., a Pfizer company

Exhibit 10.1 Certain portions of this exhibit have been omitted pursuant to Rule 601(b)(10) of Regulation S-K. The omitted information is (i) not material and (ii) would likely cause competitive harm to the Company if publicly disclosed. Information that has been omitted has been noted in this document with a placeholder identified by the mark “[***]”. EXECUTION COPY PROMOTION AGREEMENT by and bet

June 3, 2019 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 31, 2019 SIGA TECHNOLOGIES, INC.

June 3, 2019 EX-99.1

SIGA Announces TPOXX® Promotion Agreement with Meridian Medical Technologies, Inc. (A Pfizer Company) for International Markets

Exhibit 99.1 SIGA Announces TPOXX® Promotion Agreement with Meridian Medical Technologies, Inc. (A Pfizer Company) for International Markets June 3, 2019, 7:30 am ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, today announced that it has entered into an international promotion agreement with Meridian Med

May 22, 2019 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 21, 2019 SIGA TECHNOLOGIES, INC.

May 20, 2019 EX-99.1

SIGA Announces Exercise of Option for the Purchase of Raw Materials for Oral TPOXX® Manufacturing Totaling $11 Million Raw Materials expected to be used to Support Manufacture of 363,070 Courses of Oral TPOXX

Exhibit 99.1 SIGA Announces Exercise of Option for the Purchase of Raw Materials for Oral TPOXX® Manufacturing Totaling $11 Million Raw Materials expected to be used to Support Manufacture of 363,070 Courses of Oral TPOXX May 20, 2019 NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, today announced the exerci

May 20, 2019 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 17, 2019 SIGA TECHNOLOGIES, INC.

May 20, 2019 EX-10.1

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

Exhibit 10.1 Certain portions of this exhibit have been omitted pursuant to Rule 601(b)(10) of Regulation S-K. The omitted information is (i) not material and (ii) would likely cause competitive harm to the Company if publicly disclosed. Information that has been omitted has been noted in this document with a placeholder identified by the mark “[***]”. AMENDMENT OF SOLICITATION/MODIFICATION OF CON

May 10, 2019 8-K

Entry into a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 6, 2019 SIGA TECHNOLOGIES, INC.

May 2, 2019 10-Q

SIGA / SIGA Technologies, Inc. 10-Q Quarterly Report 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended March 31, 2019 Or ¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-230

April 29, 2019 DEF 14A

SIGA / SIGA Technologies, Inc. DEF 14A DEF 14A

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  o Check the appropriate box:  o Preliminary Proxy Statement  o Confidential, for Use of the Commission Only (as permitted by Rule 14a-

March 6, 2019 10-K

SIGA / SIGA Technologies, Inc. 10-K (Annual Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) x Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2018 Or o Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-23047 Ta

March 6, 2019 EX-10.2

COMMERCIAL MANUFACTURING AGREEMENT

COMMERCIAL MANUFACTURING AGREEMENT This COMMERCIAL MANUFACTURING AGREEMENT (this “Agreement”) is entered into effective as of October 1, 2018 (the “Effective Date”), by and between SIGA Technologies, Inc.

March 6, 2019 EX-10.1

1. CONTRACT ID CODE PAGE OF PAGES AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1 2 2. AMENDMENT/MODIFICATION NO. 0001 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. OS235415 5. PROJECT NO. (If applicable) 6. ISSUED BY CODE HHS

1. CONTRACT ID CODE PAGE OF PAGES AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1 2 2. AMENDMENT/MODIFICATION NO. 0001 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. OS235415 5. PROJECT NO. (If applicable) 6. ISSUED BY CODE HHS/OS/ASPR/BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDAO1 US DEPT OF HEALTH & HUMAN SERVICES ASST SEC OF PREPAREDNESS & RESPONSE ACQ

February 14, 2019 SC 13G/A

SIGAQ / SIGA Technologies, Inc. / JET CAPITAL INVESTORS L P - SIGA TECHNOLOGIES, INC. Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 6)* SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 826917106 (CUSIP Number) December 31, 2018 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the rule pursu

February 13, 2019 SC 13G/A

SIGAQ / SIGA Technologies, Inc. / Nantahala Capital Management, LLC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* SIGA Technologies, Inc. (Name of Issuer) Common Stock, par value $.0001, per share (Title of Class of Securities) 826917106 (CUSIP Number) December 31, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate th

November 6, 2018 EX-10.7

CHECK ONE

Exhibit 10.7 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 3 2. AMENDMENT/MODIFICATION NO 0018 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ NO 5. PROJECT NO. (if applicable.), 6. ISSUED BY CODE HHS/OS/ASPR/BARDA 330 Independence Ave., S.W. Room 640-G Washington DC 20201 HHS/OS/ASPR/BARDA 7 ADMINISTERED BY (if other than Item 6) CODE ASPR-BARD

November 6, 2018 EX-10.6

CHECK ONE

Exhibit 10.6 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 15 2. AMENDMENT/MODIFICATION NO 0017 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ NO 5. PROJECT NO. (if applicable.), 6. ISSUED BY CODE ASPR - BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 20201 ASPR - BARDA 7 ADMINISTERED BY (if other than Item 6) CODE ASPR-BARDA 330 Ind

November 6, 2018 10-Q

SIGA / SIGA Technologies, Inc. 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended September 30, 2018 Or ¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0

November 6, 2018 EX-10.5

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 | 2 2 AMENDMENT/MODIFICATION NO. 0016 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. OS227396 5. PROJECT NO. (If applicable) 6. ISSUED BY CODE AS

Exhibit 10.5 AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES 1 | 2 2 AMENDMENT/MODIFICATION NO. 0016 3. EFFECTIVE DATE See Block 16C 4. REQUISITION/PURCHASE REQ. NO. OS227396 5. PROJECT NO. (If applicable) 6. ISSUED BY CODE ASPR-BARDA 7. ADMINISTERED BY (If other than Item 6) CODE ASPR-BARDA02 ASPR-BARDA 200 Independence Ave., S.W. Room 640-G Washington DC 2020

November 1, 2018 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 31, 2018 SIGA TECHNOLOGIES, INC.

November 1, 2018 EX-99.1

SIGA Announces Priority Review Voucher Transaction Totaling $80 Million

Exhibit 99.1 SIGA Announces Priority Review Voucher Transaction Totaling $80 Million November 1, 2018, 7:30am ET NEW YORK - SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, today announced that it has entered into an agreement to sell its medical countermeasures priority review voucher (PRV) for a lump sum payment of $8

November 1, 2018 EX-2.1

Asset Purchase Agreement by and between SIGA Technologies, Inc. Eli Lilly and Company October 31, 2018 Asset Purchase Agreement

Exhibit 2.1 EXECUTION VERSION Asset Purchase Agreement by and between SIGA Technologies, Inc. and Eli Lilly and Company October 31, 2018 Asset Purchase Agreement This Asset Purchase Agreement (this “Agreement”) is made and entered into as of October 31, 2018 (the “Effective Date”), by and between Eli Lilly and Company (“Buyer”) and SIGA Technologies, Inc. (“Seller”). Buyer and Seller may hereinaft

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