SIGA TECHNOLOGIES INC — Director's Dealing 2011

May 20, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SIGA TECHNOLOGIES INC (SIGA)
CIK: 0001010086
Period of Report: 2011-05-19

Reporting Person: ROSE ERIC A MD (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-19	Common Stock, par value $.0001 per share	S	41500	$13.65	Disposed	562180	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $.0001 per share	13300	Indirect

Footnotes

F1: 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.

F2: 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.