SIGA Technologies Inc.

SIGA APPLAUDS EFFORTS TO PROMOTE PRIVATE SECTOR PARTICIPATION IN SMALLPOX BIODEFENSE

Monday 03 November 2008

Government Declaration Provides Liability Protection for Smallpox Countermeasures

NEW YORK, November 3, 2008 – SIGA Technologies, Inc. (Nasdaq: SIGA),

specializing in the development of pharmaceutical agents to fight bio-warfare pathogens, today

lauded the U.S. Department of Health and Human Services (HHS) for its declaration this month

recognizing the serious threat that smallpox and other orthopoxviruses pose to the general

population if used as a weapon during a terrorist attack. As part of this declaration, HHS used its

authority under federal law to grant targeted liability protections for eventual providers like SIGA

of countermeasures to be used in the event of a smallpox-related public health emergency.

Under the HHS declaration, in the event of a declared emergency, the provider of any

vaccine or antiviral used to identify, prevent or treat smallpox or other orthopoxviruses will be

held harmless for certain liabilities as defined under section 319F–3 of the Public Health Service

Act (codified at title 42 of the U.S. Code, section 247d–6d). The immunity will cover, among

other things, any activities, and present or future Federal contracts, cooperative agreements,

grants, interagency agreements, or memoranda of understanding involving countermeasures that

are used and administered in accordance with the declaration.

SIGA’s Chief Executive Officer, Dr. Eric A. Rose, applauded this step, “Harnessing the

considerable potential of the private biotech sector has helped the United States government meet

many of the challenges set forth under Project Bioshield after September 11. By limiting the

liabilities that may arise from developing and supplying a treatment for a threat like smallpox that

can have an immense, crippling affect on the United States, the government will allow for

increased participation by private sector suppliers like SIGA. This action encourages further

innovation and support for developing solutions in the fight against bio-terrorism, and recognizes

the importance of the role of the private sector in doing so.”

More information on the HHS declaration can be found at:

http://edocket.access.gpo.gov/2008/pdf/E8-24737.pdf.

a company

About SIGA Technologies, Inc.

SIGA Technologies is applying viral and bacterial genomics and sophisticated computational

modeling in the design and development of novel products for the prevention and treatment of

serious infectious diseases, with an emphasis on products for biological warfare defense. SIGA

believes that it is a leader in the development of pharmaceutical agents to fight potential biowarfare

pathogens. SIGA has antiviral programs targeting smallpox and other Category A

pathogens, including arenaviruses (Lassa fever, Junin, Machupo, Guanarito, Sabia, and

lymphocytic choriomeningitis), dengue virus, and the filoviruses (Ebola and Marburg). For more

information about SIGA, please visit SIGA’s Web site at

http://www.siga.com/.

Forward Looking Statement

This press release contains or implies certain “forward-looking statements” within the meaning of

the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding

the efficacy of potential products, the timelines for bringing such products to market and the

continued development and possible eventual approval of such products. Forward-looking

statements are based on management’s estimates, assumptions and projections, and are subject to

uncertainties, many of which are beyond SIGA’s control. Actual results may differ materially

from those anticipated in any forward-looking statement. Factors that may cause such differences

include the risks that (a) potential products that appear promising to SIGA or its collaborators

cannot be shown to be efficacious or safe in subsequent pre-clinical or clinical trials, (b) SIGA or

its collaborators will not obtain appropriate or necessary governmental approvals to market these

or other potential products, (c) SIGA may not be able to obtain anticipated funding for its

development projects or other needed funding, (d) SIGA may not be able to secure funding from

anticipated government contracts and grants, (e) SIGA may not be able to secure or enforce

sufficient legal rights in its products, including sufficient patent protection for its products,

(f) regulatory approval for SIGA’s products may require further or additional testing that will

delay or prevent approval and (g) SIGA may not qualify for the HHS immunity provided through

the declaration due to various limitations and restrictions contained therein or in the applicable

statutes. More detailed information about SIGA and risk factors that may affect the realization of

forward-looking statements, including the forward-looking statements in this 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, 2007, 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.

Contact:

KCSA Strategic Communications

Todd Fromer / Marybeth Csaby / David Burke

212-896-1215 / 1236 / 1258

Tfromer@kcsa.com / mcsaby@kcsa.com / dburke@kcsa.com