UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP ( ) Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instructions 1(b). 1. Name and Address of Reporting Person Weiner Michael, M.D. 161 Fort Washington Avenue, 7th Floor New York, NY 10032 2. Issuer Name and Ticker or Trading Symbol Siga Technologies, Inc. -- SIGA 3. IRS or Social Security Number of Reporting Person (Voluntary) 4. Statement for Month/Year August, 2001 5. If Amendment, Date of Original (Month/Year) 6. Relationship of Reporting Person(s) to Issuer (Check all applicable) (X) Director ( ) 10% Owner ( ) Officer (give title below) ( ) Other (specify below) 7. Individual or Joint/Group Filing (Check Applicable Line) (X) Form filed by One Reporting Person ( ) Form filed by More than One Reporting Person ----------------------------------------------------------------------------------------------------------------------------------- Table I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned | -----------------------------------------------------------------------------------------------------------------------------------| 1. Title of Security |2. |3. |4.Securities Acquired (A) |5.Amount of |6.Dir |7.Nature of Indirect | | Transaction | or Disposed of (D) | Securities |ect | Beneficial Ownership | | | | | Beneficially |(D)or | | | | | | | A/| | Owned at |Indir | | | Date |Code|V| Amount | D | Price | End of Month |ect(I)| | -----------------------------------------------------------------------------------------------------------------------------------| -----------------------------------------------------------------------------------------------------------------------------------| | | | | | | | | | | -----------------------------------------------------------------------------------------------------------------------------------| | | | | | | | | | | -----------------------------------------------------------------------------------------------------------------------------------| | | | | | | | | | | -----------------------------------------------------------------------------------------------------------------------------------| Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. * If the form is filed by more than one reporting person, see Instruction 4(b)(v). (Over) SEC 1474 (7-96) Page 1 of 2 ----------------------------------------------------------------------------------------------------------------------------------- Table II -- Derivative Securitites Acquired, Disposed of, or Beneficially Owned | -----------------------------------------------------------------------------------------------------------------------------------| 1.Title of Derivative |2.Con- |3. |4. |5.Number of De |6.Date Exer|7.Title and Amount |8.Price|9.Number |10.|11.Nature of| Security |version |Transaction | rivative Secu |cisable and| of Underlying |of Deri|of Deriva |Dir|Indirect | |or Exer | | | rities Acqui |Expiration | Securities |vative |tive |ect|Beneficial | |cise | | | red(A) or Dis |Date(Month/| |Secu |Securities |(D)|Ownership | |Price of| | | posed of(D) |Day/Year) | |rity |Benefi |or | | |Deriva- | | | |Date |Expir| | |ficially |Ind| | |tive | | | | A/|Exer-|ation| Title and Number | |Owned at |ire| | |Secu- | | | | | D |cisa-|Date | of Shares | |End of |ct | | |rity |Date |Code|V| Amount | |ble | | | |Month |(I)| | -----------------------------------------------------------------------------------------------------------------------------------| -----------------------------------------------------------------------------------------------------------------------------------| Stock Option |$2.50 |8/15/01| A |V| 100,000 |A |8/15/01|5/3/11|Common Stock|100,000| | 100,000 | D | | (Right to buy) | | | | | | | | | | | | | | | -----------------------------------------------------------------------------------------------------------------------------------| | | | | | | | | | | | | | | | -----------------------------------------------------------------------------------------------------------------------------------| Explanation of Responses: /s/ Weiner Michael, M.D. -------------------------------- ** Signature of Reporting Person October 26, 2001 ----------------- Date ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedure. Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number. SEC 1474 (7-96) Page 2 of 2