SEC Form 3

FORM 3

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

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1. Name and Address of Reporting Person* MAFCO HOLDINGS INC (Last) (First) (Middle) 35 East 62nd Street (Street) New York NY 10021 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 08/13/2003	3. Issuer Name and Ticker or Trading Symbol SIGA TECHNOLOGIES INC [ SIGA ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock(1)	1,181,912(2)	I	Owned through wholly-owned corporation

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Warrant (right to buy)	08/13/2003	08/13/2010	Common Stock	341,493(2)	2	I	Owned through wholly-owned corporation
Option (right to buy)	08/13/2003	10/13/2003	Common Stock	6,146,875(3)	1.44	I	Owned through wholly-owned corporation
Option (right to buy)	08/13/2003	10/13/2003	Warrant	3,073,438(3)	(3)	I	Owned through wholly-owned corporation

1. Name and Address of Reporting Person* MAFCO HOLDINGS INC (Last) (First) (Middle) 35 East 62nd Street (Street) New York NY 10021 (City) (State) (Zip)

1. Name and Address of Reporting Person* PERELMAN RONALD O (Last) (First) (Middle) 35 East 62nd Street (Street) New York NY 10021 (City) (State) (Zip)

1. Name and Address of Reporting Person* MACANDREWS & FORBES HOLDINGS INC (Last) (First) (Middle) 35 EAST 62ND STREET (Street) NEW YORK NY 10021 (City) (State) (Zip)

Explanation of Responses:

1. Common Stock, par value $0.0001 per share ("Common Stock").

2. MacAndrews & Forbes Holdings Inc. ("Holdings"), a wholly owned subsidiary of Mafco Holdings Inc. and a joint filer hereunder, acquired from SIGA Technologies, Inc. (the "Company") in a private placement, pursuant to a Securities Purchase Agreement (the "Purchase Agreement") by and between the Company and Holdings, dated August 13, 2003, 682,986 shares of Common Stock at a per share purchase price of $1.44 and a warrant to purchase 341,493 shares of Common Stock, exercisable for $2.00 per share, for no additional consideration. Holdings had previously acquired 498,926 shares of Common Stock in a privately negotiated transaction.

3. Pursuant to the Purchase Agreement, Holdings acquired an option to purchase (a) up to 6,146,875 shares of Common Stock ("Tranche B Shares") at a per share purchase price of $1.44 and (b) a warrant to purchase a number of shares of Common Stock equal to 50% of the number of Tranche B Shares, exercisable for $2.00 per share, for no additional consideration.

Remarks:

Ronald O. Perelman, a joint filer hereunder, beneficially owns 100% of the common stock of Mafco Holdings Inc., which beneficially owns 100% of the common stock of MacAndrews & Forbes Holdings Inc. MacAndrews & Forbes Holdings Inc. has beneficial ownership of the securities described in Tables I and II hereof.

	By: /s/ Barry F. Schwartz Name: Barry F. Schwartz Title: Executive Vice President and General Counsel	08/21/2003
	Barry F. Schwartz for Ronald O. Perelman, pursuant to a Power of Attorney filed with the Securities and Exchange Commission	08/20/2003
	Barry F. Schwartz, Executive Vice President and General Counsel	08/21/2003
	** Signature of Reporting Person	Date
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