Participants should call (866) 748-8653 (United States/Canada) or (678) 825-8234 (International) and request the SIGA call or provide confirmation code 25489223. A live broadcast of the call will be available on the Company's website at www.SIGA.com under the 'Events & Presentations' tab in the Investor Relations section.

A replay of the call will be available approximately two hours after the call and will be accessible until 11:59 P.M. ET on December 1, 2011. To listen to the replay, dial (855) 859-2056 (Domestic) or (404) 537-3406 (International) and enter the code 25489223. The webcast of the event will also be archived on the Company's website for two weeks under the 'Events & Presentations' tab in the Investor Relations section.

About SIGA Technologies, Inc.

In the United States and around the world, populations face a serious but unmet need for drugs to protect against potentially catastrophic emerging viral pathogens and biological weapons of mass destruction. SIGA Technologies, Inc. is a pharmaceutical company specializing in the development and commercialization of therapeutic solutions for some of the most lethal disease-causing pathogens in the world, including smallpox, Ebola, dengue, Lassa fever and other dangerous viruses. Our business is to discover, develop and commercialize drugs to prevent and treat these high-priority threats. Our mission is to disarm dreaded viral diseases and create robust, modern biodefense countermeasures. For more information about SIGA, please visit SIGA's web site at www.siga.com .