ENZON INC
SC 13D/A, 1999-11-05
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                  ------------

                                  SCHEDULE 13D
                                 (Rule 13d-101)

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

                              (Amendment No. 1)(1)

                                   ENZON, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.01 Par Value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    29390400
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

      Todd J. Emmerman, Esq., c/o Rosenman & Colin LLP, 575 Madison Avenue,
                            New York, New York 10022
                                 (212) 940-8873
- --------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                   May 1, 1998
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)

      If the filing person has previously filed a statement on Schedule 13G to
report the acquisition that is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box |_|.

            Note. Schedules filed in paper format shall include a signed
      original and five copies of the schedule, including all exhibits. See Rule
      13d-7(b) for other parties to whom copies are to be sent.

                         (Continued on following pages)

                                  Page 1 of 10

- ----------
      (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 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. 29390400                SCHEDULE 13D                Page 2 of 10 Pages
- --------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Clearwater Fund IV Ltd.
      Employer I.D. #[      ]
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |X|
                                                                        (b)  |_|
- --------------------------------------------------------------------------------
3     SEC USE ONLY


- --------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      N/A
- --------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

- --------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      British Virgin Islands
- --------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        0
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            0
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               0
    WITH                --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        0
- --------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      0
- --------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |_|


- --------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      0
- --------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      CO
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

CUSIP No. 29390400                SCHEDULE 13D                Page 3 of 10 Pages
- --------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Clearwater Fund IV, LLC
      Employer I.D. #[      ]
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |X|
                                                                        (b)  |_|
- --------------------------------------------------------------------------------
3     SEC USE ONLY


- --------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
- --------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

- --------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
- --------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        847,271 shares
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            0
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               847,271 shares
    WITH                --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        0
- --------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      847,271 shares
- --------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |_|


- --------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      2.3%
- --------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      OO
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

CUSIP No. 29390400                SCHEDULE 13D                Page 4 of 10 Pages
- --------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Clearwater Offshore Fund, Ltd.
      Employer I.D. #[      ]
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |X|
                                                                        (b)  |_|
- --------------------------------------------------------------------------------
3     SEC USE ONLY


- --------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      N/A
- --------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

- --------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      British Virgin Islands
- --------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        40,300 shares
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            0
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               40,300 shares
    WITH                --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        0
- --------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      40,300 shares
- --------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |_|


- --------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      11%
- --------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      CO
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

This Amendment No. 1 is being filed by Clearwater Fund IV, LLC ("Clearwater
LLC"), Clearwater Offshore Fund Ltd. ("Clearwater Offshore")and Clearwater Fund
IV, Ltd. ("Clearwater Ltd."; and, collectively with Clearwater LLC and
Clearwater Offshore, the "Reporting Persons") pursuant to Rule 13-d(2)
promulgated under the Securities Exchange Act of 1934 (the "Exchange Act") and
amends the Schedule 13D previously filed by Clearwater LLC and Clearwater Ltd.
as of July 22, 1997. This Amendment is being filed to reflect changes in the
beneficial ownership of the Reporting Persons since June 1997. This Amendment is
also being filed to add Clearwater Offshore as a Reporting Person and to reflect
the fact that the Reporting Persons, including Clearwater Offshore, are no
longer the beneficial owners of greater than 5% of the Company's Common Stock.
Terms not otherwise defined herein shall have the meaning ascribed to them in
the Schedule 13D.

Item 2. Identity and Background

      Item 2 is hereby amended and restated to read as follows:

      (a)-(c)

      This statement is being filed by Clearwater Ltd., a corporation organized
      under the laws of the British Virgin Islands, Clearwater Offshore, a
      corporation organized under the laws of the Bahamas and Clearwater LLC, a
      Delaware limited liability company. The Reporting Persons are making this
      single, joint filing because they may be deemed to constitute a "group"
      within the meaning of Section 13 (d) (3) of the Exchange Act.

      Clearwater Ltd. is wholly owned by Clearwater LLC. The principal business
      address of Clearwater LLC is 611 Druid Road East, Suite 200, Clearwater,
      Florida 33756.

      Clearwater Ltd. is currently in the process of winding up its activities.
      The principal business address of Clearwater Ltd. is CITCO Building,
      Wickhams Cay, P.O. Box 662, Road Town, Tortola, British Virgin Islands.

      The Directors of Clearwater Ltd. are Tortola Corporation Company Ltd.
      ("Tortola"), Hans Frederic Heye and Inter Caribbean Services Ltd. ("Inter
      Caribbean"). The President of Clearwater Ltd. is W. Weber.

      The principal business address of Mr. Weber and Inter Caribbean Services
      Ltd. is c/o CITCO Fund Services (Curacao) N.V., Kaya Flamboyan 9, P.O. Box
      812, Curacao, Netherland Antilles. The principal business address of
      Tortola is Wickhams Cay, P.O. Box 662, Road Town, Tortola, British Virgin
      Islands. Mr. Heye's principal business address is 611 Druid Road East,
      Suite 200, Clearwater, Florida, 33756.

      Tortola principally functions as a corporate director for offshore funds.
      Mr. Heye is principally employed as the President of Clearwater Futures,
      Inc., the general partner or trading manager of several private investment
      funds. Inter Caribbean principally functions as a corporate director for
      offshore funds. Mr. Weber is principally


                                  Page 5 of 10
<PAGE>

      employed as the Account Manager of CITCO Fund Services (Curacao) N.V., a
      provider of administrative services for offshore funds

      The principal business address of Clearwater Offshore is c/o New World
      Trustees (Bahamas) Limited, Euro-Canadian Centre, Marlboro Street, P.O.
      Box N-4465, Nassau, Bahamas. The trading manager of Clearwater Offshore is
      Clearwater Futures, Inc., the President of which is Mr. Heye. The address
      of Clearwater Futures is 611 Druid Road East, Suite 200, Clearwater,
      Florida 33756. The Directors of Clearwater Offshore are Silkwood Nominees
      Ltd., a Bahamian corporation and Manning Consultant Ltd., a Bahamian
      corporation, each of which principally functions as a provider of
      administrative services for offshore funds. The principal business
      activity of Clearwater Offshore is investing in equity securities.

      The principal business activity of Clearwater LLC is investing in equity
      private placements. The principal business address of Clearwater LLC is
      611 Druid Road East, Suite 200, Clearwater, Florida 33756. Mr. Heye is the
      Managing Member of Clearwater LLC.

Item 3. Source and Amount of Funds or Other Consideration.

      Item 3 is hereby amended as follows:

      The aggregate amount of funds used by Clearwater LLC to purchase shares of
      the Company's Common Stock since June 30, 1997 was $214,828.

      The aggregate amount of funds used by Clearwater Offshore to purchase
      shares of the Company's Common Stock reported herein was $562,790.

      The aggregate amount of funds used by Clearwater Ltd. to purchase shares
      of the Company's Common Stock on February 27, 1998 was $28,388.

Item 5. Interest in Securities of the Issuer.

      Item 5 is hereby amended and restated as follows:

      (a)-(b)

      Item 5(a) and (b) is hereby amended and restated as follows:

      The percentage of the Company's outstanding Common Stock reported herein
      owned by each Reporting Person is based upon information contained in the
      Company's Statement on Form 10-Q for the period ended March 31, 1999.
      Clearwater LLC beneficially owns 847,271 shares of the Company's Common
      Stock (including warrants to purchase 638,686 shares of the Company's
      Common Stock at $4.11 per share), comprising approximately 2.3% of the
      Company's Common Stock outstanding.


                                  Page 6 of 10
<PAGE>

      Clearwater LLC has the sole power to vote and dispose of all such shares.

      Clearwater Offshore beneficially owns 40,300 shares of the Company's
      Common Stock, comprising approximately .11% of the Company's Common Stock
      outstanding.

      Clearwater Offshore has the sole power to vote and dispose of all such
      shares.

      Clearwater Ltd. owns no shares of the Company's Common Stock.

      (c)

      Item 5(c) is hereby amended as follows:

      On February 27, 1998, Clearwater Ltd. purchased 5,000 shares of the
      Company's Common Stock on the open market for $5.6775 per share. On May 1,
      1998, Clearwater Ltd. distributed in kind the 2,364,108 shares of the
      Company's Common Stock beneficially owned by it (including 473,723 Common
      Stock Purchase Warrants) to Clearwater LLC, and, as a result, ceased to be
      the beneficial owner of any shares of the Company's Common Stock.

      Between June 30, 1997 and April 28, 1998, Clearwater LLC purchased an
      aggregate of 44,000 shares of the Company's Common Stock in open market
      transactions at prices ranging between $2.3525 and $6.8838 per share.

      On October 5, 1998, Clearwater LLC sold its warrants to purchase 200,000
      shares of the Company's Common Stock at an exercise price of $5.625 per
      share for an aggregate amount of $200,000.

      Between June 30, 1999 and October 1, 1999, Clearwater LLC sold an
      aggregate of 1,556,089 shares of the Company's Common Stock in open market
      transactions.

      Between July 1, 1999 and October 1, 1999, Clearwater LLC distributed an
      aggregate of 235,211 shares of the Company's Common Stock to an investor
      in Clearwater LLC as redemptions-in-kind at prices ranging between
      $20.0981 and $34.4508.

      Between September 24, 1997 and April 30, 1999, Clearwater Offshore
      purchased an aggregate of 102,300 shares of the Company's Common Stock in
      open market transactions at prices ranging between $4.1025 and $5.9985 per
      share.

      Between November 13, 1998 and November 19, 1998 Clearwater Offshore sold
      an aggregate of 62,000 shares of the Company's Common Stock in open market
      transactions at prices ranging between $9.98 and $10.0575 per share.


                                  Page 7 of 10
<PAGE>

      (e)

      Item 5(e) is hereby amended and restated as follows:

      On September 7, 1999, the Reporting Persons ceased to be the beneficial
      owner of more than five percent of the Company's Common Stock.

Item 7. Material to be Filed as Exhibits.

      Item 7 is hereby amended and restated as follows:

      Exhibit 1: Agreement Pursuant to Rule 13d-1(k).


                                  Page 8 of 10
<PAGE>

                                    SIGNATURE

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

      Dated: October 6, 1999

                                       CLEARWATER FUND IV LTD.

                                       /s/ Hans Frederic Heye
                                       -----------------------------------------
                                       By:  Hans Frederic Heye
                                       Title: Director


                                       CLEARWATER FUND IV, LLC

                                       /s/ Hans Frederic Heye
                                       -----------------------------------------
                                       By: Hans Frederic Heye
                                       Title: Managing Member


                                       CLEARWATER OFFSHORE FUND LTD.

                                       By: Manning Consultant Ltd., Director

                                       By: Falkirk, S.A., its attorney-in-fact

                                       /s/ Lindsey Cancino
                                       -----------------------------------------
                                       By: Lindsey Cancino
                                       Title: Director


                                  Page 9 of 10



                                    EXHIBIT 1

                JOINT FILING AGREEMENT PURSUANT TO RULE 13D-1(k)

            In accordance with Rule 13d-1(k) promulgated under the Securities
Exchange Act of 1934, as amended, each of the undersigned agrees to the filing
on behalf of each of a Statement on Schedule 13D, and all amendments thereto,
with respect to the shares of common stock, $.01 par value, of Enzon, Inc.


                                       CLEARWATER FUND IV LTD.

                                       /s/ Hans Frederic Heye
                                       -----------------------------------------
                                       By: Hans Frederic Heye
                                       Title: Director


                                       CLEARWATER FUND IV, LLC

                                       /s/ Hans Frederic Heye
                                       -----------------------------------------
                                       By: Hans Frederic Heye
                                       Title: Managing Member


                                       CLEARWATER OFFSHORE FUND LTD.

                                       By: Manning Consultant Ltd., Director

                                       By: Falkirk, S.A., its attorney-in-fact

                                       /s/ Lindsey Cancino
                                       -----------------------------------------
                                       By: Lindsey Cancino
                                       Title: Director


                                 Page 10 of 10



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