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OMB APPROVAL
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OMB Number 3235-0287
Expires: September 30, 1998
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U.S. 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 this box if no longer subject to Section 16. Form 4 or Form 5
obligations may continue. See Instruction 1(b).
(Print or Type Responses)
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1. Name and Address of Reporting Person*
MacKinnon A.M. "Don"
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(Last) (First) (Middle)
c/o Enzon, Inc. 20 Kingsbridge Road
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(Street)
Piscataway NJ 08854
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(City) (State) (Zip)
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2. Issuer Name and Ticker or Trading Symbol
Enzon, Inc. (ENZN)
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3. IRS Identification Number of Reporting Person, if an entity (Voluntary)
________________________________________________________________________________
4. Statement for Month/Year
March 1999
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5. If Amendment, Date of Original (Month/Year)
________________________________________________________________________________
6. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
[X] Director [_] 10% Owner
[_] Officer (give title below) [_] Other (specify below)
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7. Individual or Joint/Group Filing (Check Applicable Line)
[X] Form filed by One Reporting Person
[_] Form filed by More than One Reporting Person
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Table I -- Non-Derivative Securities Acquired, Disposed of,
or Beneficially Owned
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<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)
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<S> <C> <C> <C> <C> <C> <C> <C> <C> <C>
Common Stock 3/16/99 M 20,000 A $2.0625
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Common Stock 3/16/99 M 40,000 A $2.9375
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Common Stock 3/16/99 M 40,000 A $5.375
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Common Stock 3/16/99 G(1) 50,000 D 67,816 D
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61,800 I by wife
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</TABLE>
<PAGE>
FORM 4 (continued)
Table II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
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<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)
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<S> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C>
Stock Option Common
(right to buy)(2) $2.0625 3/16/99 M 20,000 8/21/95 2/21/05 Stock 20,000 D
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Stock Option Common
(right to buy)(2) $2.9375 3/16/99 M 40,000 (3) 1/2/07 Stock 20,000 D
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Stock Option Common
(right to buy)(2) $5.375 3/16/99 M 40,000 (4) 12/31/03 Stock 40,000 D
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</TABLE>
Explanation of Responses:
(1) The reporting person gifted an aggregate of 50,000 shares of the
registrant's common stock to his wife.
(2) Options granted under the registrant's non-qualified stock option plan and
qualified under Rule 16b-3.
(3) Options vested in two tranches of 20,000 shares each on January 1, 1998 and
January 1, 1999.
(4) Options vested in two tranches of 20,000 shares each on December 31, 1994
and December 31, 1995.
/s/ A.M. "DON" MACKINNON 4/8/99
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**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 perosns who are to respond to the colleciton of information contained
in this form are not required to respond unless the form displays a currently
valid OMB Number.
Page 2
SEC 1474 (7-97)
