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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                     FORM 5

               ANNUAL STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,
       Section 17(a) of the Public Utility Holding Company Act of 1935 or
               Section 30(f) of the Investment Company Act of 1940

[_]  Check box if no longer  subject to Section 16. Form 4 or Form 5 obligations
     may continue. See Instruction 1(b).

[_]  Form 3 Holdings Reported

[_]  Form 4 Transactions Reported

________________________________________________________________________________
1.   Name and Address of Reporting Person*

     Thurman                       Randy                     H.

- --------------------------------------------------------------------------------
   (Last)                            (First)              (Middle)

     c/o Enzon, Inc.,  20 Kingsbridge Road

- --------------------------------------------------------------------------------
                                    (Street)

     Piscataway,                New Jersey                 08854
- --------------------------------------------------------------------------------
   (City)                            (State)                (Zip)
________________________________________________________________________________
2.   Issuer Name and Ticker or Trading Symbol

     Enzon, Inc. (ENZN)

________________________________________________________________________________
3.   IRS Identification Number of Reporting Person, if an Entity (Voluntary)



________________________________________________________________________________
4.   Statement for Month/Year

     6/99

________________________________________________________________________________
5.   If Amendment, Date of Original (Month/Year)



________________________________________________________________________________
6.   Relationship of Reporting Person 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
================================================================================


                                                                                                 5.             6.
                                                                 4.                              Amount of      Owner-
                                                                 Securities Acquired (A) or      Securities     ship
                                                                 Disposed of (D)                 Beneficially   Form:     7.
                                                                 (Instr. 3, 4 and 5)             Owned at End   Direct    Nature of
                                      2.            3.           -----------------------------   of Issuer's    (D) or    Indirect
1.                                    Transaction   Transaction               (A)                Fiscal Year    Indirect  Beneficial
Title of Security                     Date          Code            Amount    or     Price       (Instr. 3      (I)       Ownership
(Instr. 3)                            (mm/dd/yy)    (Instr. 8)                (D)                and 4)         (Instr.4) (Instr. 4)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                  

Common Stock                          6/30/99        A              146       A   See footnote 1                D
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock                          3/31/99        A              204       A   See footnote 1                D
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock                          12/31/98       A              263       A   See footnote 1                D
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock                          9/30/98        A              453       A   See footnote 1  26,003        D
- ------------------------------------------------------------------------------------------------------------------------------------

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

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

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

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

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====================================================================================================================================


1)   Securities granted by Enzon, Inc. pursuant to the Independent Directors
     Stock Plan as compensation for service as a member of the Board of
     Directors of Enzon, Inc. and qualified under Rule 16b-3(c).

*    If the form is filed by more than one Reporting Person, see Instruction
     4(b)(v).


                                                                          (Over)
                                                                 SEC 2270 (7-97)

FORM 5 (continued) Table II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) ================================================================================ 9. 10. Number Owner- of ship 2. Deriv- of Conver- 5. 7. ative Deriv- 11. sion Number of Title and Amount Secur- ative Nature or Derivative 6. of Underlying 8. ities Secur- of Exer- Securities Date Securities Price Bene- ity: In- cise 3. Acquired (A) Exercisable and (Instr. 3 and 4) of ficially Direct direct Price Trans- 4. or Disposed Expiration Date ---------------- Deriv- Owned (D) or Bene- 1. of action Trans- of (D) (Month/Day/Year) Amount ative at End In- ficial Title of Deriv- Date action (Instr. 3, ---------------- or Secur- of direct Owner- Derivative ative (Month/ Code 4 and 5) Date Expira- Number ity Year (I) ship Security Secur- Day/ (Instr. ------------ Exer- tion of (Instr. (Instr. (Instr. (Instr. (Instr. 3) ity Year) 8) (A) (D) cisable Date Title Shares 5) 4) 4) 4) - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ ==================================================================================================================================== Explanation of Responses: /s/ Randy Thurman November 11, 1999 - --------------------------------------------- ----------------------- **Signature of Reporting Person 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. Page 2 SEC 2270 (7-97)