================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ---------- FORM 10-Q/A (Amendment No. 1) (Mark One) |X| Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarter Ended September 30, 2006 OR |_| Transition Report Pursuant To Section 13 Or 15(d) Of the Securities Exchange Act of 1934 For the Transition Period from ___________ to _____________ Commission File No. 0-23047 ---------- SIGA Technologies, Inc. (Exact name of registrant as specified in its charter) A Delaware Corporation IRS Employer No. 13-3864870 420 Lexington Avenue, Suite 408, New York, NY 10170 Telephone Number (212) 672-9100 Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes |X| No |_|. Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of "accelerated filer and large accelerated filer" in Rule 12b-2 of the Exchange Act. (Check one): Large Accelerated Filer |_| Accelerated Filer |_| Non-Accelerated Filer |X|. Indicate by check mark whether the registrant is a shell company (as defined in rule 12b-2 of the Exchange Act). Yes |_| No |X|. As of October 31, 2006 the registrant had 31,765,621 shares of common stock outstanding. ================================================================================ EXPLANATORY NOTE This Amendment No. 1 on Form 10-Q/A (this "Amendment") amends the Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2006 filed on November 1, 2006 (the "Original Filing"). We have filed this Amendment solely to include the information required by Part II, Item 6 - Exhibits. This information was inadvertently omitted from the Original Filing. In addition, in connection with the filing of this Amendment and pursuant to the rules of the Securities and Exchange Commission, we are including with this Amendment certain currently dated certifications. Except as described above, no other changes have been made to the Original Filing. This Amendment has not resulted in any changes to our previously reported financial results. This Amendment continues to speak as of the date of the Original Filing, and we have not updated the disclosures contained in this Amendment to reflect any events that occurred at a date subsequent to the Original Filing. 1 Part II Other information Item 6. Exhibits * 10.1 Contract, dated September 29, 2006, between SIGA Technologies, Inc. and the National Institute of Allergy and Infectious Diseases of the National Institutes for Health. * 31 Certification of Chief Financial Officer and Acting Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. * 32 Certification of Chief Financial Officer and Acting Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. * Filed herein 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. SIGA Technologies, Inc. (Registrant) Date: November 13, 2006 By: /s/ Thomas N. Konatich ------------------------ Thomas N. Konatich Chief Financial Officer and Acting Chief Executive Officer 3