-------------------------------
OMB APPROVAL
-------------------------------
OMB Number: 3235-0362
Expires: September 30, 1998
Estimated average burden
hours per response ........ 1.0
-------------------------------
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*
MacKinnon A.M. "Don"
- --------------------------------------------------------------------------------
(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 171 A See footnote 1 D
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock 3/31/99 A 204 A See footnote 1 D
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock 12/31/98 A 226 A See footnote 1 D
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock 9/30/98 A 378 A See footnote 1 D
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock 6/15/99 M 5,000 A $6.625 79,295 D
- ------------------------------------------------------------------------------------------------------------------------------------
78,300 I By wife
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
====================================================================================================================================
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)
- ------------------------------------------------------------------------------------------------------------------------------------
Stock Option (2) Common
(Right to Buy) $6.625 6/15/99 M 5,000 12/31/94 12/31/99 Stock 5,000 0 D
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
====================================================================================================================================
Explanation of Responses:
(2) Granted under the Company's Non-Qualified Stock Option Plan and qualified
under Rule 16b-3
/s/ A.M. "Don" MacKinnon 11/9/99
- --------------------------------------------- -----------------------
**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)