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 OF SECURITIES 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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(Print or Type Responses)

1. Name and Address of Reporting Person * MacAndrews & Forbes Holdings Inc.   2. Issuer Name and Ticker or Trading Symbol SIGA TECHNOLOGIES INC [SIGA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 35 EAST 62ND STREET 3. Date of Earliest Transaction (Month/Day/Year) 07/30/2009 (Street) NEW YORK, NY 10065 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 07/30/2009   P   1,000,000 (1) A $ 6.24 5,635,235 I Owned through wholly-owned corporation Common Stock, par value $.0001 per share               2,472,222 I Owned through partially-owned corporation (2)

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MacAndrews & Forbes Holdings Inc. 35 EAST 62ND STREET NEW YORK, NY 10065		X
PERELMAN RONALD O 35 EAST 62ND STREET NEW YORK, NY 10065		X
MacAndrews & Forbes LLC 35 EAST 62ND STREET NEW YORK, NY 10065		X

Signatures

/s/ Barry F. Schwartz, Executive Vice Chairman		08/03/2009
**Signature of Reporting Person		Date
/s/ Barry F. Schwartz, pursuant to a Power of Attorney filed with the Securities and Exchange Commission		08/03/2009
**Signature of Reporting Person		Date
/s/ Barry F. Schwartz, Executive Vice Chairman		08/03/2009
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	On July 30, 2009, MacAndrews & Forbes LLC, a joint filer hereunder, acquired 1,000,000 shares of Common Stock, par value $.0001 per share, in a privately negotiated purchase from TransTech Pharma, Inc. ("TTP"), a corporation in which Ronald O. Perelman, a joint filer hereunder, has a direct ownership interest.
(2)	Represents securities held by TTP. Mr. Perelman disclaims beneficial ownership of the securities reported on the Form 4 as owned by TTP, except to the extent of his pecuniary interest therein. Neither MacAndrews & Forbes Holdings Inc. nor MacAndrews & Forbes LLC has any pecuniary interest in securities held by TTP.
Remarks: Ronald O. Perelman beneficially owns 100% of the common stock of MacAndrews & Forbes Holdings Inc., which beneficially owns 100% of the equity interests of MacAndrews & Forbes LLC. MacAndrews & Forbes LLC beneficially owns the securities described above as owned through wholly-owned corporation.

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