SIGA PHARMACEUTICALS INC
SC 13G, 2000-02-16
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   ----------

                                  SCHEDULE 13G
                                 (Rule 13d-102)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED
                           PURSUANT TO RULE 13d-2(b)

                              (Amendment No. __)(1)

                             SIGA TECHNOLOGIES, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                        Common Stock, $.0001 par valuee
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  82 6917-10-6
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                February 1, 2000
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

      Check the appropriate box to designate the rule pursuant to which
this Schedule is filed:

      |_| Rule 13d-1 (b)
      |X| Rule 13d-1 (c)
      |_| Rule 13d-1 (d)

- ----------
      (1) The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

      The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
<PAGE>

CUSIP No. 82 6917-10-6            SCHEDULE 13G                 Page 2 of 7 Pages
- --------------------------------------------------------------------------------
1     NAME OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

      Donald G. Drapkin
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
- --------------------------------------------------------------------------------
3     SEC USE ONLY


- --------------------------------------------------------------------------------
4     CITIZENSHIP OR PLACE OF ORGANIZATION

      USA
- --------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        716,522 (see Note A)
                  --------------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
    SHARES
 BENEFICIALLY           N/A
   OWNED BY       --------------------------------------------------------------
     EACH         7     SOLE DISPOSITIVE POWER
  REPORTING
    PERSON              716,522 (see Note A)
     WITH         --------------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        N/A
- --------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      716,522 (see Note A)
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
      CERTAIN SHARES*

                                                                             |_|
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      9.8% (see Note A)
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

ITEM 1            (a)      NAME OF ISSUER

                           SIGA TECHNOLOGIES, INC.

                  (b)      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES

                           420 Lexington Avenue,
                           Suite 620
                           New York, NY 10170.

ITEM 2            (a)      NAME OF PERSON FILING

                           Donald G. Drapkin

                  (b)      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE,
                           RESIDENCE

                           35 E. 62nd St.
                           New York, NY 10021


                  (c)      CITIZENSHIP

                           USA

                  (d)      TITLE OF CLASS OF SECURITIES

                           Common Stock, $.0001 par value

                  (e)      CUSIP NUMBER

                           82 6917-10-6

<PAGE>

ITEM 3            If This Statement is Filed Pursuant to Rule 13d-1(b), or
                  13d-2(b) or (c), Check Whether the Person Filing is a:

         (a)      [ ] Broker or dealer registered under section 15 of the Act

         (b)      [ ] Bank as defined in section 3(a)(6) of the Act

         (c)      [ ] Insurance company as defined in section 3(a)(19) of the
                  Act

         (d)      [ ] Investment company registered under section 8 of the
                  Investment Company Act of 1940

         (e)      [ ] An investment adviser in accordance with Rule
                  13d-1(b)(1)(ii)(E)

         (f)      [ ] An employee benefit plan or endowment fund in accordance
                  with Rule 13d-1(b)(1)(ii)(F)

         (g)      [ ] A parent holding company or control person in accordance
                  with Rule 13d-1(b)(1)(ii)(G)

         (h)      [ ] A savings association as defined in section 3(b) of the
                  Federal Deposit Insurance Act

         (i)      [ ] A church plan that is excluded from the definition of an
                  investment company under section 3(c)(14) of the Investment
                  Company Act of 1940

         (j)      [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J)

         If this statement is filed pursuant to Rule 13d-1(c), check this
box [x]

ITEM 4            OWNERSHIP

         (a)      Amount beneficially owned:

                  716,522 (see Note A)

         (b)      Percent of class:

                  9.8% (see Note A)

<PAGE>

         (c)      Number of shares as to which the person has:

                  (i) Sole power to vote or to direct the vote:

                  716,522 (see Note A)

                  (ii) Shared power to vote or to direct the vote:

                  N/A

                  (iii) Sole power to dispose or to direct the disposition of:

                  716,522 (see Note A)

                  (iv) Shared power to dispose or to direct the disposition of:

                  N/A

ITEM 5            OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

         If this statement is being filed to report the fact that as of the date
         hereof the reporting person has ceased to be the beneficial owner of
         more than five percent of the class of securities, check the following
         [ ]

ITEM 6            OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                  PERSON

                  N/A

ITEM 7            IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
                  ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT
                  HOLDING COMPANY

                  N/A

ITEM 8            IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

                  N/A

ITEM 9            NOTICE OF DISSOLUTION OF GROUP

                  N/A

ITEM 10           CERTIFICATION

                  By signing below I certify that, to the best of my knowledge
                  and belief, the securities referred to above were not acquired
                  are not being held for the purpose of or with the effect of
                  changing or influencing the control of the issuer of the
                  securities and were not acquired and are not held in
                  connection with or as a participant in any transaction having
                  that purpose or effect.

<PAGE>

                                    SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

                                                        February 11 , 2000
                                                    -------------------------
                                                            (Date)


                                                      s/Donald G. Drapkkin
                                                    -------------------------
                                                          (Signature)


                                                      Donald G. Drapkin
                                                    -------------------------
                                                         (Name/Title)

<PAGE>

                                     NOTE A

Based on information provided by the Issuer, there are currently outstanding
6,602,712 shares of the Common Stock of the Issuer.

Reporting Person currently owns no shares of the Common Stock of the Issuer.

Reporting Person holds $500,000 principal amount of the Issuer's 6% Convertible
Debenture Due January 31, 2002 (the "Maturity Date"). Under its terms, the
Debenture is generally convertible into shares of Common Stock of the Issuer,
where conversions are effected at a fixed conversion rate (the "Conversion
Price") equal to $1.4375 or 347,826 shares. If interest on the Debentures
through the first anniversary of the issuance (which is more than sixty days
from the date of this Schedule 13G) were paid (at the option of the Issuer) in
Common Stock based on the same Conversion Price, the Reporting Person would
receive an additional 20,870 shares of Common Stock.

In addition, the Reporting Person holds five year warrants to purchase 347,826
shares of Common Stock (the "Warrant") at an exercise price of $3.4059 per
share.

The Debenture and the Warrant, may not be convertible or exercisable into shares
of Common Stock of the Issuer by the holder, because Section 4(C) of the
Debenture and the terms of the Warrant restrict the rights of Reporting Person
to convert or exercise if, as a result of such conversion or exercise (but
without giving effect to shares issuable upon conversions or exercises not yet
submitted), the Reporting Person and its affiliates would have actual ownership
of more than 9.99% of the outstanding shares of the Common Stock of the Issuer

If all of the Debentures were currently fully convertible and converted, if the
interest on the entire principal of the Debentures through the first anniversary
of their issuance were paid in Common Stock at the same Conversion Price and if
the Warrant were fully exercised, the Reporting Person's total shares of Common
Stock would be 716,522 shares (9.8%).

The Reporting Person disclaims any beneficial interest in or voting rights in
the shares of Common Stock of the Issuer held by or issuable upon the exercise
of any conversion or other rights held by any other holder of shares or such
rights of the Issuer.



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