SIGA

SEC source: 0001209191-22-037538 · doc4.xml · derivative · entry 3

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 22,831 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 15, 2021, and fully vested on the date of the Company's 2022 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs were granted on June 15, 2021, and fully vested on the date of the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-22-037538 · doc4.xml · nonDerivative · entry 2

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,982

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 17, 2021. Partial cash-settlement of RSUs under the Board compensation program is designed to address tax obligations in connection with the vesting of RSUs.

F2 · acquired: 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 17, 2021. 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: 0001209191-22-037538 · doc4.xml · nonDerivative · entry 1

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,831

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: 0001209191-22-037535 · doc4.xml · derivative · entry 4

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,620

Underlying: Common Stock, par value $.0001 per share · 14,620 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 4,386 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 2023 annual meeting of stockholders.

F5 · derivative.expiration_date: The RSUs fully vest on the date of the Company's 2023 annual meeting of stockholders.

SEC source: 0001209191-22-037535 · doc4.xml · derivative · entry 3

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 22,831 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 15, 2021, and fully vested on the date of the Company's 2022 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs were granted on June 15, 2021, and fully vested on the date of the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-22-037535 · doc4.xml · nonDerivative · entry 2

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 116,857

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 17, 2021. Partial cash-settlement of RSUs under the Board compensation program is designed to address tax obligations in connection with the vesting of RSUs.

F2 · acquired: 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 17, 2021. 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: 0001209191-22-037535 · doc4.xml · nonDerivative · entry 1

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 123,706

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: 0001209191-21-069114 · doc4.xml · nonDerivative · entry 1

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,875

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold on December 9, 2021 in multiple transactions at prices ranging from $7.75 to $7.98, inclusive. The reporting person undertakes to provide to SIGA Technologies, Inc., any security holder of SIGA Technologies, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4.

SEC source: 0001209191-21-049275 · doc4.xml · derivative · entry 3

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, Par Value $.0001 Per Share · 26,667 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 July 31, 2019 and vested over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021.

F2 · derivative.exercise_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on July 31, 2019 and vested over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021.

F2 · derivative.expiration_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on July 31, 2019 and vested over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021.

SEC source: 0001209191-21-049275 · doc4.xml · nonDerivative · entry 2

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 251,370

F1 · shares: Represents the withholding by SIGA Technologies, Inc. of shares of Common Stock (based on $6.37 per share, the closing stock price on July 30, 2021) to satisfy tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock.

SEC source: 0001209191-21-049275 · doc4.xml · nonDerivative · entry 1

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 265,272

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: 0001209191-21-049274 · doc4.xml · derivative · entry 3

Abrams Robin Elizabeth · CIK 0001671781 · General Counsel and CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, Par Value $.0001 Per Share · 26,667 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 July 31, 2019 and vested over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021.

F2 · derivative.exercise_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on July 31, 2019 and vested over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021.

F2 · derivative.expiration_date: RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on July 31, 2019 and vested over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021.

SEC source: 0001209191-21-049274 · doc4.xml · nonDerivative · entry 2

Abrams Robin Elizabeth · CIK 0001671781 · General Counsel and CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,787

F1 · shares: Represents the withholding by SIGA Technologies, Inc. of shares of Common Stock (based on $6.37 per share, the closing stock price on July 30, 2021) to satisfy tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock.

SEC source: 0001209191-21-049274 · doc4.xml · nonDerivative · entry 1

Abrams Robin Elizabeth · CIK 0001671781 · General Counsel and CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,088

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: 0001209191-21-041495 · doc4.xml · derivative · entry 2

ROSE ERIC A MD · CIK 0001139301 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 15,000 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.

F2 · derivative.exercise_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

SEC source: 0001209191-21-041495 · doc4.xml · nonDerivative · entry 1

ROSE ERIC A MD · CIK 0001139301 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,068,593

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: 0001209191-21-041494 · doc4.xml · derivative · entry 2

CONSTANCE THOMAS E · CIK 0001139307 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 15,000 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.

F2 · derivative.exercise_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

SEC source: 0001209191-21-041494 · doc4.xml · nonDerivative · entry 1

CONSTANCE THOMAS E · CIK 0001139307 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 327,806

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: 0001209191-21-041492 · doc4.xml · derivative · entry 3

Plansky Michael C. · CIK 0001526291 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,831

Underlying: Common Stock, par value $.0001 per share · 22,831 shares

Expires not disclosed

F3 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 6,849 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F4 · derivative.exercise_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

F4 · derivative.expiration_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-21-041492 · doc4.xml · derivative · entry 2

Plansky Michael C. · CIK 0001526291 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 15,000 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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F2 · derivative.exercise_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

SEC source: 0001209191-21-041492 · doc4.xml · nonDerivative · entry 1

Plansky Michael C. · CIK 0001526291 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0001209191-21-041488 · doc4.xml · derivative · entry 3

Marshall Joseph W III · CIK 0001458584 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,831

Underlying: Common Stock, par value $.0001 per share · 22,831 shares

Expires not disclosed

F3 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 6,849 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F4 · derivative.exercise_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

F4 · derivative.expiration_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-21-041488 · doc4.xml · derivative · entry 2

Marshall Joseph W III · CIK 0001458584 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 15,000 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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F2 · derivative.exercise_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

SEC source: 0001209191-21-041488 · doc4.xml · nonDerivative · entry 1

Marshall Joseph W III · CIK 0001458584 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 172,769

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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0001209191-21-041491 · doc4.xml · derivative · entry 1

Nemirovsky Julian · CIK 0001835535 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,831

Underlying: Common Stock, par value $.0001 per share · 22,831 shares

Expires not disclosed

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, of which up to 6,849 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, and immediately prior to, the Company's 2022 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-21-041487 · doc4.xml · derivative · entry 3

Kane Julie · CIK 0001640728 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,831

Underlying: Common Stock, par value $.0001 per share · 22,831 shares

Expires not disclosed

F3 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 6,849 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F4 · derivative.exercise_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

F4 · derivative.expiration_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-21-041487 · doc4.xml · derivative · entry 2

Kane Julie · CIK 0001640728 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 15,000 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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F2 · derivative.exercise_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

SEC source: 0001209191-21-041487 · doc4.xml · nonDerivative · entry 1

Kane Julie · CIK 0001640728 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,500

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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0001209191-21-041483 · doc4.xml · derivative · entry 3

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,831

Underlying: Common Stock, par value $.0001 per share · 22,831 shares

Expires not disclosed

F3 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 6,849 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F4 · derivative.exercise_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

F4 · derivative.expiration_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-21-041483 · doc4.xml · derivative · entry 2

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 15,000 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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F2 · derivative.exercise_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

SEC source: 0001209191-21-041483 · doc4.xml · nonDerivative · entry 1

DURNAN JAYMIE A · CIK 0001187313 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0001209191-21-041479 · doc4.xml · derivative · entry 3

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,831

Underlying: Common Stock, par value $.0001 per share · 22,831 shares

Expires not disclosed

F3 · derivative.exercise_price: RSUs represent contingent rights to receive common stock of the Company on a one-for-one basis, of which up to 6,849 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F4 · derivative.exercise_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

F4 · derivative.expiration_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-21-041479 · doc4.xml · derivative · entry 2

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.0001 per share · 15,000 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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

F2 · derivative.exercise_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

F2 · derivative.expiration_date: The RSUs were granted on June 16, 2020, and fully vested on the date of, and immediately prior to, the Company's 2021 annual meeting of stockholders.

SEC source: 0001209191-21-041479 · doc4.xml · nonDerivative · entry 1

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 130,875

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 unit ("RSUs") represent contingent rights to receive common stock of SIGA Technologies, Inc. (the "Company") on a one-for-one basis.

SEC source: 0001209191-21-041472 · doc4.xml · derivative · entry 2

Phillips Holly L. · CIK 0001867723 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,831

Underlying: Common Stock, par value $.0001 per share · 22,831 shares

Expires not disclosed

F2 · 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, of which up to 6,849 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F3 · derivative.exercise_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-21-041472 · doc4.xml · derivative · entry 1

Phillips Holly L. · CIK 0001867723 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,000

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

Expires 2031-06-15

F1 · derivative.exercise_date: The options vest immediately upon the grant of such options.

SEC source: 0001209191-21-041458 · doc4.xml · derivative · entry 2

Nabel Gary J. · CIK 0001867450 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,831

Underlying: Common Stock, par value $.0001 per share · 22,831 shares

Expires not disclosed

F2 · 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, of which up to 6,849 RSUs are expected to settle in cash value thereof but may be settled in shares at the discretion of the board of directors.

F3 · derivative.exercise_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

F3 · derivative.expiration_date: The RSUs fully vest on the date of, and immediately prior to, the Company's 2022 annual meeting of stockholders.

SEC source: 0001209191-21-041458 · doc4.xml · derivative · entry 1

Nabel Gary J. · CIK 0001867450 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,000

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

Expires 2031-06-15

F1 · derivative.exercise_date: The options vest immediately upon the grant of such options.

SEC source: 0001140361-20-028181 · form4.xml · derivative · entry 1

Nemirovsky Julian · CIK 0001835535 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,000

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

Expires 2030-12-10

F1 · derivative.exercise_date: The options vest immediately upon the grant of such options.

SEC source: 0001140361-20-019334 · form4.xml · nonDerivative · entry 1

Antal James · CIK 0001315696 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 115,875

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold on August 27, 2020 in multiple transactions at prices ranging from $7.06 to $7.219, inclusive. The reporting person undertakes to provide to SIGA Technologies, Inc., any security holder of SIGA Technologies, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4.

SEC source: 0001140361-20-017846 · form4.xml · derivative · entry 2

Taibi Edward P. · CIK 0001820265 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,000

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

Expires 2030-08-06

F3 · derivative.exercise_date: The options vest immediately upon the grant of such options.

SEC source: 0001140361-20-017846 · form4.xml · derivative · entry 1

Taibi Edward P. · CIK 0001820265 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Common Stock, par value $.0001 per share · 15,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") converts into one share of common stock of SIGA Technologies, Inc. (the "Company") on a one for one basis.

F2 · derivative.exercise_date: The RSUs vest on the date of and immediately prior to the 2021 annual meeting of the Company's shareholders.

F2 · derivative.expiration_date: The RSUs vest on the date of and immediately prior to the 2021 annual meeting of the Company's shareholders.

SEC source: 0001140361-20-017491 · form4.xml · derivative · entry 3

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,667

Underlying: Common Stock, par value $.0001 per share · 26,667 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: Represents vesting of certain RSUs granted on July 31, 2019 and the consequent issuance of Common Stock of the Issuer to the Reporting Person. The RSUs vest over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021. The shares of Common Stock reported in this Form 4 were issued in respect of the RSUs that vested on July 31, 2020. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis.

F2 · derivative.exercise_date: Represents vesting of certain RSUs granted on July 31, 2019 and the consequent issuance of Common Stock of the Issuer to the Reporting Person. The RSUs vest over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021. The shares of Common Stock reported in this Form 4 were issued in respect of the RSUs that vested on July 31, 2020. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis.

F2 · derivative.expiration_date: Represents vesting of certain RSUs granted on July 31, 2019 and the consequent issuance of Common Stock of the Issuer to the Reporting Person. The RSUs vest over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021. The shares of Common Stock reported in this Form 4 were issued in respect of the RSUs that vested on July 31, 2020. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis.

SEC source: 0001140361-20-017491 · form4.xml · nonDerivative · entry 2

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 238,605

F1 · shares: SIGA Technologies, Inc. (the "Issuer") has certain tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock of the Issuer. This Form 4 reports the surrender to the Issuer by the Reporting Person of 13,005 shares of Common Stock -- granted in the form of RSUs on July 31, 2019 -- in order to satisfy those withholding tax obligations.

SEC source: 0001140361-20-017491 · form4.xml · nonDerivative · entry 1

Luckshire Daniel J · CIK 0001512677 · Executive VP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 251,610

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: 0001140361-20-017485 · form4.xml · derivative · entry 3

Abrams Robin Elizabeth · CIK 0001671781 · General Counsel and CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,667

Underlying: Common Stock, par value $.0001 per share · 26,667 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: Represents vesting of certain RSUs granted on July 31, 2019 and the consequent issuance of Common Stock of the Issuer to the Reporting Person. The RSUs vest over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021. The shares of Common Stock reported in this Form 4 were issued in respect of the RSUs that vested on July 31, 2020. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis.

F2 · derivative.exercise_date: Represents vesting of certain RSUs granted on July 31, 2019 and the consequent issuance of Common Stock of the Issuer to the Reporting Person. The RSUs vest over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021. The shares of Common Stock reported in this Form 4 were issued in respect of the RSUs that vested on July 31, 2020. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis.

F2 · derivative.expiration_date: Represents vesting of certain RSUs granted on July 31, 2019 and the consequent issuance of Common Stock of the Issuer to the Reporting Person. The RSUs vest over two years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021. The shares of Common Stock reported in this Form 4 were issued in respect of the RSUs that vested on July 31, 2020. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis.

SEC source: 0001140361-20-017485 · form4.xml · nonDerivative · entry 2

Abrams Robin Elizabeth · CIK 0001671781 · General Counsel and CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,421

F1 · shares: SIGA Technologies, Inc. (the "Issuer") has certain tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock of the Issuer. This Form 4 reports the surrender to the Issuer by the Reporting Person of 14,138 shares of Common Stock -- granted in the form of RSUs on July 31, 2019 -- in order to satisfy those withholding tax obligations.

SEC source: 0001140361-20-017485 · form4.xml · nonDerivative · entry 1

Abrams Robin Elizabeth · CIK 0001671781 · General Counsel and CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,559

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: 0001140361-20-014223 · form4.xml · derivative · entry 1

SAVAS PAUL G · CIK 0001275756 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Common Stock, par value $.0001 per share · 15,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") converts into one share of common stock of SIGA Technologies, Inc. (the "Company") on a one for one basis.

F2 · derivative.exercise_date: The RSUs vest on the date of, and immediately prior to, the 2021 annual meeting of the Company's stockholders.

F2 · derivative.expiration_date: The RSUs vest on the date of, and immediately prior to, the 2021 annual meeting of the Company's stockholders.

SEC source: 0001140361-20-014221 · form4.xml · derivative · entry 1

ROSE ERIC A MD · CIK 0001139301 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Common Stock, par value $.0001 per share · 15,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") converts into one share of common stock of SIGA Technologies, Inc. (the "Company") on a one for one basis.

F2 · derivative.exercise_date: The RSUs vest on the date of, and immediately prior to, the 2021 annual meeting of the Company's stockholders.

F2 · derivative.expiration_date: The RSUs vest on the date of, and immediately prior to, the 2021 annual meeting of the Company's stockholders.