Ownership Submission
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)
__X__ 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)
06/19/2012
(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

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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
Warrant (Right to Buy) $ 2.95 (1) 06/19/2012   J(2)     247,272 (1) 06/19/2008 06/19/2012 Common Stock 247,272 (1) $ 0 0 I Owned through wholly-owned corporation
Warrant (Right to Buy) $ 2.95 (1) 06/19/2012   J(2)   247,272 (1)   06/19/2008 06/19/2014 Common Stock 247,272 (1) $ 0 247,272 I Owned through wholly-owned corporation

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   X    
PERELMAN RONALD O
35 EAST 62ND STREET
NEW YORK, NY 10065		   X   X    
MacAndrews & Forbes LLC
35 EAST 62ND STREET
NEW YORK, NY 10065		   X   X    

Signatures

 /s/ Barry F. Schwartz, Executive Vice Chairman   06/19/2012
**Signature of Reporting Person Date
 /s/ Barry F. Schwartz for Ronald O. Perelman pursuant to a Power of Attorney filed with the Securities and Exchange Commission   06/19/2012
**Signature of Reporting Person Date
 /s/ Barry F. Schwartz, Executive Vice Chairman   06/19/2012
**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) These warrants to purchase shares of the common stock ("Common Stock") of SIGA Technologies, Inc. ("SIGA") were acquired by MacAndrews & Forbes LLC on June 19, 2008 pursuant to a Letter Agreement, by and between SIGA and MacAndrews & Forbes LLC. These warrants were previously reported at the time of acquisition as the right to buy 238,000 shares of Common Stock at an exercise price of $3.06 per share, but, pursuant to the anti-dilution provisions of the warrants, were adjusted to reflect the effects of certain of SIGA's subsequent issuances.
(2) On June 19, 2012, the term of a Warrant Agreement with MacAndrews & Forbes LLC, covering 247,272 shares and initially issued in 2008, was extended to June 19, 2014.
 
Remarks:
Ronald O. Perelman, a joint filer hereunder, beneficially owns 100% of the common stock of MacAndrews & Forbes Holdings Inc., which beneficially owns 100% of the equity interests of MacAndrews & Forbes LLC, a joint filer hereunder. MacAndrews & Forbes LLC beneficially owns the securities described above.

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