Filed Under Rule 424(b)(3)
                                                           File Number 333-36682

                    Prospectus Supplement Dated May 25, 2000


                          Prospectus Dated May 24, 2000

                             SIGA TECHNOLOGIES, INC.

            The list of documents we are incorporating by reference in the
section entitled "Where You Can Find More Information" is hereby updated as

                  4.    Our Quarterly Report on Form 10-QSB for the three months
                        ended March 31, 2000 filed on May 15, 2000.