SIGA

SEC source: 0000950170-25-093472 · ownership.xml · derivative · entry 3

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 24,193 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on May 11, 2023 and vested over two years, with the first 1/2 of such RSUs vesting on July 1, 2024 and the remaining 1/2 of such RSUs vesting on July 1, 2025.

F2 · derivative.exercise_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on May 11, 2023 and vested over two years, with the first 1/2 of such RSUs vesting on July 1, 2024 and the remaining 1/2 of such RSUs vesting on July 1, 2025.

F2 · derivative.expiration_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on May 11, 2023 and vested over two years, with the first 1/2 of such RSUs vesting on July 1, 2024 and the remaining 1/2 of such RSUs vesting on July 1, 2025.

SEC source: 0000950170-25-093472 · ownership.xml · nonDerivative · entry 2

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 275,064

F1 · shares: Represents the withholding by SIGA Technologies, Inc. of shares of Common Stock (based on $6.49 per share, the closing stock price on July 1, 2025) to satisfy tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock.

SEC source: 0000950170-25-093472 · ownership.xml · nonDerivative · entry 1

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 287,410

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000950170-25-093464 · ownership.xml · derivative · entry 3

Hruby Dennis E · CIK 0001301548 · EVP & Chief Scientific Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 32,258 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on May 11, 2023 and vested over two years, with the first 1/2 of such RSUs vesting on July 1, 2024 and the remaining 1/2 of such RSUs vesting on July 1, 2025.

F2 · derivative.exercise_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on May 11, 2023 and vested over two years, with the first 1/2 of such RSUs vesting on July 1, 2024 and the remaining 1/2 of such RSUs vesting on July 1, 2025.

F2 · derivative.expiration_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on May 11, 2023 and vested over two years, with the first 1/2 of such RSUs vesting on July 1, 2024 and the remaining 1/2 of such RSUs vesting on July 1, 2025.

SEC source: 0000950170-25-093464 · ownership.xml · nonDerivative · entry 2

Hruby Dennis E · CIK 0001301548 · EVP & Chief Scientific Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 191,047

F1 · shares: Represents the withholding by SIGA Technologies, Inc. of shares of Common Stock (based on $6.49 per share, the closing stock price on July 1, 2025) to satisfy tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock.

SEC source: 0000950170-25-093464 · ownership.xml · nonDerivative · entry 1

Hruby Dennis E · CIK 0001301548 · EVP & Chief Scientific Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 201,514

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000950170-25-084876 · ownership.xml · derivative · entry 1

KEANE JOHN M · CIK 0001267719 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,116

Underlying: Common Stock, par value $.0001 per share · 24,116 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 7,235 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F2 · derivative.exercise_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

SEC source: 0000950170-25-084875 · ownership.xml · derivative · entry 4

Ford Harold Eugene Jr. · CIK 0001799464 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,116

Underlying: Common Stock, par value $.0001 per share · 24,116 shares

Expires not disclosed

F4 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 7,235 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F5 · derivative.exercise_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

F5 · derivative.expiration_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

SEC source: 0000950170-25-084875 · ownership.xml · derivative · entry 3

Ford Harold Eugene Jr. · CIK 0001799464 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 19,084 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

SEC source: 0000950170-25-084875 · ownership.xml · nonDerivative · entry 2

Ford Harold Eugene Jr. · CIK 0001799464 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,657

F2 · kind: Reflects RSUs that were cash-settled, per the terms of the compensation program for Board Directors and as noted on the Form 4 filed on June 13, 2024. Partial cash-settlement of RSUs under the Board compensation program is designed to address tax obligations in connection with the vesting of RSUs.

SEC source: 0000950170-25-084875 · ownership.xml · nonDerivative · entry 1

Ford Harold Eugene Jr. · CIK 0001799464 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,382

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0000950170-25-084874 · ownership.xml · derivative · entry 4

Nemirovsky Julian · CIK 0001835535 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,116

Underlying: Common Stock, par value $.0001 per share · 24,116 shares

Expires not disclosed

F4 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 7,235 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F5 · derivative.exercise_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

F5 · derivative.expiration_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

SEC source: 0000950170-25-084874 · ownership.xml · derivative · entry 3

Nemirovsky Julian · CIK 0001835535 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 19,084 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

SEC source: 0000950170-25-084874 · ownership.xml · nonDerivative · entry 2

Nemirovsky Julian · CIK 0001835535 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,873

F2 · kind: Reflects RSUs that were cash-settled, per the terms of the compensation program for Board Directors and as noted on the Form 4 filed on June 13, 2024. Partial cash-settlement of RSUs under the Board compensation program is designed to address tax obligations in connection with the vesting of RSUs.

SEC source: 0000950170-25-084874 · ownership.xml · nonDerivative · entry 1

Nemirovsky Julian · CIK 0001835535 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,598

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0000950170-25-084873 · ownership.xml · derivative · entry 4

Phillips Holly L. · CIK 0001867723 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,116

Underlying: Common Stock, par value $.0001 per share · 24,116 shares

Expires not disclosed

F4 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 7,235 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F5 · derivative.exercise_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

F5 · derivative.expiration_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

SEC source: 0000950170-25-084873 · ownership.xml · derivative · entry 3

Phillips Holly L. · CIK 0001867723 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 19,084 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

SEC source: 0000950170-25-084873 · ownership.xml · nonDerivative · entry 2

Phillips Holly L. · CIK 0001867723 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,873

F2 · kind: Reflects RSUs that were cash-settled, per the terms of the compensation program for Board Directors and as noted on the Form 4 filed on June 13, 2024. Partial cash-settlement of RSUs under the Board compensation program is designed to address tax obligations in connection with the vesting of RSUs.

SEC source: 0000950170-25-084873 · ownership.xml · nonDerivative · entry 1

Phillips Holly L. · CIK 0001867723 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,598

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0000950170-25-084872 · ownership.xml · derivative · entry 4

Marshall Joseph W III · CIK 0001458584 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,116

Underlying: Common Stock, par value $.0001 per share · 24,116 shares

Expires not disclosed

F4 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 7,235 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F5 · derivative.exercise_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

F5 · derivative.expiration_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

SEC source: 0000950170-25-084872 · ownership.xml · derivative · entry 3

Marshall Joseph W III · CIK 0001458584 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 19,084 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

SEC source: 0000950170-25-084872 · ownership.xml · nonDerivative · entry 2

Marshall Joseph W III · CIK 0001458584 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 229,642

F2 · kind: Reflects RSUs that were cash-settled, per the terms of the compensation program for Board Directors and as noted on the Form 4 filed on June 13, 2024. Partial cash-settlement of RSUs under the Board compensation program is designed to address tax obligations in connection with the vesting of RSUs.

SEC source: 0000950170-25-084872 · ownership.xml · nonDerivative · entry 1

Marshall Joseph W III · CIK 0001458584 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 235,367

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0000950170-25-084871 · ownership.xml · derivative · entry 4

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,116

Underlying: Common Stock, par value $.0001 per share · 24,116 shares

Expires not disclosed

F4 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 7,235 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F5 · derivative.exercise_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

F5 · derivative.expiration_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

SEC source: 0000950170-25-084871 · ownership.xml · derivative · entry 3

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 19,084 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

SEC source: 0000950170-25-084871 · ownership.xml · nonDerivative · entry 2

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,873

F2 · kind: Reflects RSUs that were cash-settled, per the terms of the compensation program for Board Directors and as noted on the Form 4 filed on June 13, 2024. Partial cash-settlement of RSUs under the Board compensation program is designed to address tax obligations in connection with the vesting of RSUs.

SEC source: 0000950170-25-084871 · ownership.xml · nonDerivative · entry 1

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,598

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0000950170-25-084856 · ownership.xml · derivative · entry 4

Nabel Gary J. · CIK 0001867450 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,116

Underlying: Common Stock, par value $.0001 per share · 24,116 shares

Expires not disclosed

F4 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 7,235 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F5 · derivative.exercise_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

F5 · derivative.expiration_date: The RSUs fully vest on the date of the Company's 2026 annual meeting of stockholders.

SEC source: 0000950170-25-084856 · ownership.xml · derivative · entry 3

Nabel Gary J. · CIK 0001867450 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 19,084 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs were granted on June 11, 2024, and fully vested on the date of the Company's 2025 annual meeting of stockholders.

SEC source: 0000950170-25-084856 · ownership.xml · nonDerivative · entry 2

Nabel Gary J. · CIK 0001867450 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,873

F2 · kind: Reflects RSUs that were cash-settled, per the terms of the compensation program for Board Directors and as noted on the Form 4 filed on June 13, 2024. Partial cash-settlement of RSUs under the Board compensation program is designed to address tax obligations in connection with the vesting of RSUs.

SEC source: 0000950170-25-084856 · ownership.xml · nonDerivative · entry 1

Nabel Gary J. · CIK 0001867450 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,598

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0000950170-25-056371 · ownership.xml · derivative · entry 5

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,841

Underlying: Common Stock, par value $.0001 per share · 13,841 shares

Expires not disclosed

F3 · derivative.exercise_price: PSUs represent contingent rights to receive Common Stock on a one-for-one basis.

F1 · kind: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

F1 · derivative.exercise_date: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

F1 · derivative.expiration_date: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

SEC source: 0000950170-25-056371 · ownership.xml · derivative · entry 4

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 13,841 shares

Expires not disclosed

F3 · derivative.exercise_price: PSUs represent contingent rights to receive Common Stock on a one-for-one basis.

F1 · kind: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

F1 · derivative.exercise_date: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

F1 · derivative.expiration_date: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

SEC source: 0000950170-25-056371 · ownership.xml · derivative · entry 3

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,841

Underlying: Common Stock, par value $.0001 per share · 6,920 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: PSUs represent contingent rights to receive Common Stock on a one-for-one basis.

F1 · kind: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

F1 · derivative.exercise_date: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

F1 · derivative.expiration_date: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

SEC source: 0000950170-25-056371 · ownership.xml · nonDerivative · entry 2

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,444

F2 · shares: Represents the withholding by SIGA Technologies, Inc. of shares of Common Stock (based on $5.99 per share, the closing stock price on April 17, 2025) to satisfy tax withholding obligations associated with the vesting of PSUs and the consequent issuance of Common Stock.

SEC source: 0000950170-25-056371 · ownership.xml · nonDerivative · entry 1

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,976

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: On April 18, 2025, the Issuer's Board of Directors approved an amendment of the outstanding performance stock units ("PSUs") previously granted to the reporting person on March 25, 2024, to account for the Issuer's payment of a special cash dividend of $0.60 per share in April 2024 that would have applied to such PSUs based on the reporting person's actual period of service with the Issuer. As modified, the relevant stock price hurdles for these PSUs were each lowered by $0.60 such that (a) 6,920 PSUs vested immediately, (b) 6,920 PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends declared during the measurement date) (the "Stock Price") is at or above $7.40, and (c) 6,921 PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.40.

SEC source: 0000950170-25-045413 · ownership.xml · derivative · entry 3

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,841

Underlying: Common Stock, par value $.0001 per share · 6,920 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on March 25, 2024 and vest over three years, one-third on each of the first three anniversaries of the date of grant.

F2 · derivative.exercise_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on March 25, 2024 and vest over three years, one-third on each of the first three anniversaries of the date of grant.

F2 · derivative.expiration_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on March 25, 2024 and vest over three years, one-third on each of the first three anniversaries of the date of grant.

SEC source: 0000950170-25-045413 · ownership.xml · nonDerivative · entry 2

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,056

F1 · shares: Represents the withholding by SIGA Technologies, Inc. of shares of Common Stock (based on $5.89 per share, the closing stock price on March 25, 2025) to satisfy tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock.

SEC source: 0000950170-25-045413 · ownership.xml · nonDerivative · entry 1

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,820

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000950170-25-042138 · ownership.xml · derivative · entry 1

KEANE JOHN M · CIK 0001267719 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,000

Underlying: Common Stock, par value $.0001 per share · 25,000 shares

Expires 2035-03-17

F1 · derivative.exercise_date: The options were fully vested upon grant.

SEC source: 0000950170-25-039560 · ownership.xml · derivative · entry 1

Nguyen Diem · CIK 0001814338 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 255,137

Underlying: Common Stock, par value $.0001 per share · 255,137 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F1 · derivative.exercise_date: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F1 · derivative.expiration_date: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

SEC source: 0000950170-25-039559 · ownership.xml · derivative · entry 1

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,511

Underlying: Common Stock, par value $.0001 per share · 34,511 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F1 · derivative.exercise_date: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F1 · derivative.expiration_date: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

SEC source: 0000950170-25-039557 · ownership.xml · derivative · entry 1

Hruby Dennis E · CIK 0001301548 · EVP & Chief Scientific Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,336

Underlying: Common Stock, par value $.0001 per share · 34,336 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F1 · derivative.exercise_date: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F1 · derivative.expiration_date: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

SEC source: 0000950170-25-039556 · ownership.xml · derivative · entry 1

Miller Larry R. · CIK 0002016490 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,784

Underlying: Common Stock, par value $.0001 per share · 63,784 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F1 · derivative.exercise_date: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F1 · derivative.expiration_date: Restricted stock units ("RSUs") represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

SEC source: 0000950170-25-010569 · ownership.xml · derivative · entry 3

Nguyen Diem · CIK 0001814338 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,805

Underlying: Common Stock, par value $.0001 per share · 55,902 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F3 · derivative.exercise_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

F3 · derivative.expiration_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

SEC source: 0000950170-25-010569 · ownership.xml · nonDerivative · entry 2

Nguyen Diem · CIK 0001814338 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,653

F2 · shares: Represents the withholding by the Issuer of shares of Common Stock (based on $6.34 per share, the closing stock price on January 27, 2025) to satisfy tax withholding obligations associated with the vesting of RSUs and the consequent issuance of Common Stock.

SEC source: 0000950170-25-010569 · ownership.xml · nonDerivative · entry 1

Nguyen Diem · CIK 0001814338 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,297

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Represents the acquisition of Common Stock from the vesting of one-third of the restricted stock units ("RSUs") granted on January 27, 2024.

SEC source: 0000950170-24-118340 · ownership.xml · derivative · entry 3

Nguyen Diem · CIK 0001814338 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 118,577

Underlying: Common Stock, par value $.0001 per share · 59,288 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: PSUs represent contingent rights to receive Common Stock on a one-for-one basis. These PSUs vest as follows: (a) one-third of these PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends issued during the measurement date) (the "Stock Price") is at or above $7.00, (b) one-third of these PSUs vest, if during any period of 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.00, and (c) one-third of these PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $9.00. On March 12, 2024, the Board of Directors of the Issuer declared a special dividend of $0.60 per share of Common Stock, and each applicable Stock Price hurdle was lowered by $0.60 accordingly.

F3 · derivative.exercise_date: PSUs represent contingent rights to receive Common Stock on a one-for-one basis. These PSUs vest as follows: (a) one-third of these PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends issued during the measurement date) (the "Stock Price") is at or above $7.00, (b) one-third of these PSUs vest, if during any period of 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.00, and (c) one-third of these PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $9.00. On March 12, 2024, the Board of Directors of the Issuer declared a special dividend of $0.60 per share of Common Stock, and each applicable Stock Price hurdle was lowered by $0.60 accordingly.

F3 · derivative.expiration_date: PSUs represent contingent rights to receive Common Stock on a one-for-one basis. These PSUs vest as follows: (a) one-third of these PSUs vest if, during any period of 90 consecutive trading days during the three-year period beginning on the grant date (the "Performance Period"), the Issuer's Common Stock closing stock price (plus the per share value of any dividends issued during the measurement date) (the "Stock Price") is at or above $7.00, (b) one-third of these PSUs vest, if during any period of 90 consecutive trading days during the Performance Period, the Stock Price is at or above $8.00, and (c) one-third of these PSUs vest, if during any 90 consecutive trading days during the Performance Period, the Stock Price is at or above $9.00. On March 12, 2024, the Board of Directors of the Issuer declared a special dividend of $0.60 per share of Common Stock, and each applicable Stock Price hurdle was lowered by $0.60 accordingly.

SEC source: 0000950170-24-118340 · ownership.xml · nonDerivative · entry 2

Nguyen Diem · CIK 0001814338 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,395

F2 · shares: Represents the withholding by the Issuer of shares of Common Stock (based on $6.77 per share, the closing stock price on October 25, 2024) to satisfy tax withholding obligations associated with the vesting of PSUs and the consequent issuance of Common Stock.

SEC source: 0000950170-24-118340 · ownership.xml · nonDerivative · entry 1

Nguyen Diem · CIK 0001814338 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,288

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Represents the acquisition of Common Stock from the vesting of one-third of the performance stock units ("PSUs") granted on January 27, 2024 upon achieving the $7.00 share price target (adjusted for dividends paid).