Sec Form 4 Filing - Miller Larry R. @ SIGA TECHNOLOGIES INC - 2024-03-25

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Miller Larry R. 2. Issuer Name and Ticker or Trading Symbol SIGA TECHNOLOGIES INC [ SIGA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) General Counsel (Last) (First) (Middle) C/O SIGA TECHNOLOGIES, INC., 31 EAST 62ND STREET 3. Date of Earliest Transaction (MM/DD/YY) 03/25/2024 (Street) NEW YORK, NY10065 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, par value $.0001 per share 03/25/2024 A 49,940 A $ 0 49,940 D Common Stock, par value $.0001 per share 03/25/2024 F 19,040 ( 1 ) D $ 8.35 30,900 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to buy) $ 8.35 03/25/2024 A 61,347 ( 2 ) 03/25/2034 Common Stock, par value $.0001 per share 61,347 $ 0 61,347 D Stock Option (Right to buy) $ 8.35 03/25/2024 A 25,504 ( 3 ) 03/25/2034 Common Stock, par value $.0001 per share 25,504 $ 0 25,504 D Restricted Stock Units ( 4 ) 03/25/2024 A 20,761 ( 4 ) ( 4 ) Common Stock, par value $.0001 per share 20,761 $ 0 20,761 D Performance Stock Units ( 5 ) 03/25/2024 A 20,761 ( 5 ) ( 5 ) Common Stock, par value $.0001 per share 20,761 $ 0 20,761 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Miller Larry R. C/O SIGA TECHNOLOGIES, INC. 31 EAST 62ND STREET NEW YORK, NY10065 General Counsel Signatures /s/ Larry R. Miller 03/27/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents the withholding by SIGA Technologies, Inc. of shares of Common Stock (based on $8.35 per share, the closing stock price on March 25, 2024) to satisfy tax withholding obligations associated with the grant of Common Stock reported herein that immediately vested upon grant. ( 2 )The options vest over two years, one-half on each of the first two anniversaries of the date of grant. ( 3 )The options vest over three years, one-third on each of the first three anniversaries of the date of grant. ( 4 )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. ( 5 )Performance stock units ("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 declared 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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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