Sec Form 4 Filing - ROSE ERIC A MD @ SIGA TECHNOLOGIES INC - 2018-08-20

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 ROSE ERIC A MD 2. Issuer Name and Ticker or Trading Symbol SIGA TECHNOLOGIES INC [ SIGA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Executive Chairman (Last) (First) (Middle) C/O SIGA TECHNOLOGIES, INC., 31 EAST 62ND STREET 3. Date of Earliest Transaction (MM/DD/YY) 08/20/2018 (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 08/20/2018 M 400,000 ( 1 ) A $ 2.49 1,133,267 D Common Stock, par value $.0001 per share 08/20/2018 F 234,277 ( 1 ) D $ 7.98 898,990 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) $ 2.49 08/20/2018 M 400,000 ( 2 ) 11/14/2018 Common Stock, par value $.0001 per share 400,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other ROSE ERIC A MD C/O SIGA TECHNOLOGIES, INC. 31 EAST 62ND STREET NEW YORK, NY10065 X Executive Chairman Signatures /s/ Eric A Rose, M.D. 08/22/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 4 reports the exercise of options for 400,000 shares of common stock of SIGA Technologies, Inc. (the "Issuer") and the related surrender to the Issuer of 234,277 shares of common stock of the Issuer by the Reporting Person in order to (i) effect the option exercise and (ii) satisfy certain tax withholding obligations of the Issuer associated with the exercise of options and the consequent issuance of common stock of the Issuer. No shares of common stock of the Issuer were sold by the Reporting Person in a market transaction. ( 2 )The options with respect to 100,000 shares vested pro rata on the first, second and third anniversaries of the date of grant. The options with respect to the remaining 300,000 shares vested upon achievement of certain milestones.

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).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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