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Thomas N. Konatich SIGA Technologies, Inc. Chief Financial Officer (212) 672-9100 SIGA REPORTS RESIGNATION OF CHIEF EXECUTIVE OFFICER New York

Key Takeaway: REPORTS RESIGNATION OF CHIEF EXECUTIVE OFFICER April 3, 2006 - In anticipation of the closing of the proposed merger with Pharmathene, Inc., announced March 14, 2006, SIGA SIGA) and Dr. Bernard L. Kasten, its Chief Executive Officer, announced Dr. Kasten's agreement to resign

Full Press Release Details

REPORTS RESIGNATION OF CHIEF EXECUTIVE OFFICER
April 3, 2006 - In anticipation of the closing of the proposed merger with
Pharmathene, Inc., announced March 14, 2006, SIGA
SIGA) and Dr. Bernard L.
Kasten, its Chief Executive Officer, announced Dr. Kasten's agreement to resign
his employment with SIGA effective the earlier of April, 30 2006 or Dr. Kasten's
obtaining new employment. Effective immediately upon Dr. Kasten's resignation,
Thomas N. Konatich, currently SIGA's Chief Financial Officer, will be appointed
to serve in an additional capacity as Acting Chief Executive Officer of SIGA
until such point as the board of directors of SIGA shall select a permanent
Chief Executive Officer.
SIGA Technologies, Inc.
Technologies is applying viral and bacterial genomics and sophisticated
computational modeling in the design and development of novel products for
prevention and treatment of serious infectious diseases, with an emphasis on
products for biological warfare defense. SIGA has the potential to become
a significant force in the discovery of vaccine and pharmaceutical agents to
fight emerging pathogens. SIGA's product development programs emphasize
the increasingly serious problem of drug resistant bacteria. In addition
to smallpox, SIGA has antiviral programs targeting other Category A viral
pathogens, including arenaviruses (Lassa Fever Virus, Junin, Macupo, Guanarito,
and Sabia), Lymphocytic choriomeningitis virus (LCMV), Dengue, the filoviruses,
Ebola and Marburg. For more information about SIGA, please visit SIGA's
Web site at www.siga.com.
Looking Statement Disclosure
press release contains certain "forward-looking statements'' within the meaning
of the Private Securities Litigation Reform Act of 1995, as amended.
Forward-looking statements are based on management's estimates, assumptions and
projections, and are subject to uncertainties, many of which are beyond the
control of SIGA. Actual results may differ materially from those
anticipated in any forward-looking statement.
detailed information about SIGA and risk factors that may affect the realization
of forward-looking statements, including the forward-looking statements in
press release is set forth in SIGA's filings with the Securities and Exchange
Commission, including SIGA's Annual Report on Form 10-K for the fiscal year
ended December 31, 2005,
and in other documents that SIGA has filed with the Commission. SIGA urges
investors and security holders to read those documents free of charge at the
Commission's Web site at http://www.sec.gov. Interested parties may also
obtain those documents free of charge from SIGA. Forward-looking
statements speak only as to the date they are made, and except for any
obligation under the U.S. federal securities laws, SIGA undertakes no obligation
to publicly update any forward-looking statement as a result of new information,
future events or otherwise.
Last updated: Apr 3, 2006