SIGA TECHNOLOGIES INC — Director's Dealing 2013

May 23, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SIGA TECHNOLOGIES INC (SIGA)
CIK: 0001010086
Period of Report: 2013-05-23

Reporting Person: CONSTANCE THOMAS E (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-23	Common Stock, par value $.0001 per share	M	15000	—	Acquired	170000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-23	Restricted Stock Units	$	M	15000	Disposed		Common Stock, par value $.0001 per share (15000)	Direct

Footnotes

F1: Each restricted stock unit ("RSU") converts into one share of common stock of SIGA Technologies, Inc. on a one for one basis.

F2: The RSUs vest on the first anniversary of the grant date.