ENZON INC
4, 1998-09-03
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                                  OMB Number:          3235-0287
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                                                  hours per response ....... 0.5
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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                     FORM 4

                  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 of Section 16. Form 4 or Form 5 obligations
     may continue. See Instruction 1(b).

________________________________________________________________________________
1.   Name and Address of Reporting Person*

Zuerblis                        Kenneth                     J.
- --------------------------------------------------------------------------------
   (Last)                           (First)             (Middle)

20 Kingsbridge Road
- --------------------------------------------------------------------------------
                                    (Street)

Piscataway                           NJ                    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


July/1998
________________________________________________________________________________
5.   If Amendment, Date of Original (Month/Year)


================================================================================
6.   Relationship of Reporting Person to Issuer
     (Check all applicable)

     [_]  Director                             [_]  10% Owner
     [X]  Officer (give title below)           [_]  Other (specify below)

     Vice President, Finance and Chief Financial Officer
________________________________________________________________________________
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
================================================================================
<TABLE>
<CAPTION>
                                                                                                                6.
                                                                 4.                              5.             Owner-
                                                                 Securities Acquired (A) or      Amount of      ship
                                                    3.           Disposed of (D)                 Securities     Form:     7.
                                                    Transaction  (Instr. 3, 4 and 5)             Beneficially   Direct    Nature of
                                      2.            Code         ------------------------------- Owned at End   (D) or    Indirect
1.                                    Transaction   (Instr. 8)                   (A)             of Month       Indirect  Beneficial
Title of Security                     Date          ------------     Amount      or     Price    (Instr. 3      (I)       Ownership
(Instr. 3)                            (mm/dd/yy)     Code     V                  (D)             and 4)         (Instr.4) (Instr. 4)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                   <C>            <C>      <C>    <C>         <C>    <C>      <C>            <C>       <C>


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

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

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

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

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

====================================================================================================================================
</TABLE>
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).

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 conrol number.

                                                                          (Over)
                                                                 SEC 1474 (7-97)
<PAGE>


FORM 4 (continued)

Table II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned
         (e.g., puts, calls, warrants, options, convertible securities)

================================================================================
<TABLE>
<CAPTION>
                                                                                                                    10.     
                                                                                                          9.        Owner-  
                                                                                                          Number    ship    
                                                                                                          of        Form
                    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-             4.       Securities    Date              Securities        Price    Bene-     ity:     In-    
                    cise     3.       Trans-   Acquired (A)  Exercisable and   (Instr. 3 and 4)  of       ficially  Direct   direct 
                    Price    Trans-   action   or Disposed   Expiration Date   ----------------  Deriv-   Owned     (D) or   Bene-  
1.                  of       action   Code     of(D)         (Month/Day/Year)            Amount  ative    at End    In-      ficial 
Title of            Deriv-   Date     (Instr.  (Instr. 3,    ----------------            or      Secur-   of        direct   Owner- 
Derivative          ative    (Month/  8)       4 and 5)      Date     Expira-            Number  ity      Month     (I)      ship   
Security            Secur-   Day/     ------   ------------  Exer-    tion               of      (Instr.  (Instr.   (Instr.  (Instr.
(Instr. 3)          ity      Year)    Code V    (A)   (D)    cisable  Date     Title     Shares  5)       4)        4)       4)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                 <C>      <C>      <C>  <C>  <C>   <C>    <C>      <C>      <C>       <C>     <C>      <C>       <C>      <C>

Stock Option                                                                   Common 
(right to buy)(a)   $6.50    7/21/98  A    V    70,000       (b)      7/21/08  Stock     70,000           260,000    D
- ------------------------------------------------------------------------------------------------------------------------------------

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

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

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

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

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

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

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

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

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

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

====================================================================================================================================
</TABLE>
Explanation of Responses:


/S/ KENNETH J. ZUERBLIS                                          9/1/98
- ---------------------------------------------            -----------------------
      **Signature of Reporting Person                             Date

(a)  Granted under the Company's  Non-qualified  Stock Option Plan and qualified
     under Rule 16b-3.

(b)  Options  vest in two  tranches  of 35,000  shares each on July 21, 1999 and
     July 21, 2000.

**     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 conrol number.

                                                                          Page 2
                                                                 SEC 1474 (7-97)




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