SIGA TECHNOLOGIES INC — Director's Dealing 2013

Mar 4, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SIGA TECHNOLOGIES INC (SIGA)
CIK: 0001010086
Period of Report: 2013-02-28

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-02-28	Common Stock, par value $.0001 per share	M	66666	—	Acquired	423301	Direct
2013-02-28	Common Stock, par value $.0001 per share	F	27314	$4.28	Disposed	395987	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-02-28	Restricted Stock Units	$	M	66666	Disposed		Common Stock, par value $.0001 per share (66666)	Direct

Holdings (Non-Derivative)

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

Footnotes

F1: SIGA Technologies, Inc. (the "Issuer") has certain tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock of the Issuer. This Form 4 reports the surrender to the Issuer by the Reporting Person of 27,314 shares of Common Stock -- granted in the form of RSUs approximately one year ago -- in order to satisfy those withholding tax obligations. The Reporting Person reported the initial grant on March 1, 2012.

F2: Represents vesting of one-third of RSUs granted on February 28, 2012. The second 1/3 of such RSUs vest on February 28, 2014 and the remaining 1/3 of such RSUs vest on February 28, 2015. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis.