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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1010086	Siga Technologies Inc	SIGA	Pharmaceutical Preparations (2834)	133864870

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1139301	Md A Eric Rose	C/O Siga Technologies, Inc. 35 East 62Nd Street New York NY 10065	Chief Executive Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $.0001 Per Share	Disposition	2011-05-19	41,500	$13.65	562,180	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock, Par Value $.0001 Per Share	13,300	Indirect	By Spouse

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.54 to $13.81, inclusive. The reporting person undertakes to provide to SIGA Technologies, Inc. (the "Issuer"), any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
The proceeds from sales reported on this Form 4 are anticipated to be used to pay the taxes that have accrued in connection with the recent equity grants made to Dr. Rose under the Issuer's 2010 Stock Incentive Plan.