SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Schedule 13G

Under the Securities Exchange Act of 1934
(Amendment)

Enzon Inc
(Name of Issuer)

COM     
(Title of Class of Securities)

293904108
(CUSIP Number)

December 31, 2005
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this 
Schedule is filed:

[X]     Rule 13d-1(c)

*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 the disclosures provided in a prior page.

The information required in 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 ("Act") 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).

CUSIP No.      293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS BANK PLC
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
England
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS CAPITAL SECURITIES LIMITED
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
England.
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS CAPITAL INC
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
U.S.A.
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS PRIVATE BANK & TRUST (ISLE OF MAN) LIMITED
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
England.
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS PRIVATE BANK AND TRUST (JERSEY) LIMITED
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
England
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS BANK TRUST COMPANY LIMITED
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
England
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS BANK (Suisse) SA
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
Switzerland
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS PRIVATE BANK LIMITED
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
England
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

BRONCO (BARCLAYS CAYMAN) LIMITED
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
Cayman Islands
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

PALOMINO LIMITED
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
Cayman Islands
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      56,203
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
56,203
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
56,203
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.13%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

CUSIP No.       293904108
---------

------------------------------------------------------------------------------
(1) Names of Reporting Persons.  
I.R.S. Identification Nos. of above persons (entities only).

HYMF INC
------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a)  / /
(b)  /X/
------------------------------------------------------------------------------
(3) SEC Use Only

------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
U.S.A.
------------------------------------------------------------------------------
Number of Shares                                (5) Sole Voting Power
Beneficially Owned                                      -
by Each Reporting                               ------------------------------
Person With                                     (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power                      
-
------------------------------
(8) Shared Dispositive Power
-
------------------------------------------------------------------------------
(9) Aggregate 
-
------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
------------------------------------------------------------------------------
(12) Type of Reporting Person*

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

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
------------------------------------------------------------------------------
ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
BARCLAYS BANK PLC
------------------------------------------------------------------------------
ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
54 Lombard Street
London, England EC3P 3AH
------------------------------------------------------------------------------          
ITEM 2(C).      CITIZENSHIP
England
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
------------------------------------------------------------------------------
ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
BARCLAYS CAPITAL SECURITIES LIMITED
------------------------------------------------------------------------------
ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
5 The North Colonmade
Canary Wharf, London, England E14 4BB
------------------------------------------------------------------------------          
ITEM 2(C).      CITIZENSHIP
England
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
------------------------------------------------------------------------------
ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
BARCLAYS CAPITAL INC
------------------------------------------------------------------------------
ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
200 Park Ave
NY, NY 10166
------------------------------------------------------------------------------          
ITEM 2(C).      CITIZENSHIP
U.S.A.
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
------------------------------------------------------------------------------
ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
BARCLAYS PRIVATE BANK & TRUST (ISLE OF MAN) LIMITED
------------------------------------------------------------------------------
ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
4th Floor, Queen Victoria House
Isle of Man, IM99 IDF
------------------------------------------------------------------------------          
ITEM 2(C).      CITIZENSHIP
England
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
------------------------------------------------------------------------------
ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
BARCLAYS PRIVATE BANK AND TRUST (JERSEY) LIMITED
------------------------------------------------------------------------------
ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
39/41 Broad Street, St. Helier
Jersey, Channel Islands JE4 8PU
------------------------------------------------------------------------------          
ITEM 2(C).      CITIZENSHIP
England
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
------------------------------------------------------------------------------
ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
BARCLAYS BANK TRUST COMPANY LIMITED
------------------------------------------------------------------------------
ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
54 Lombard Street
London, EC3P 3AH, England
------------------------------------------------------------------------------          
ITEM 2(C).      CITIZENSHIP
England
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
------------------------------------------------------------------------------
ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
BARCLAYS BANK (Suisse) SA
------------------------------------------------------------------------------
ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
10 rue d'Italie 
CH-1204 Geneva 
Switzerland
------------------------------------------------------------------------------          
ITEM 2(C).      CITIZENSHIP
Switzerland
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act (15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
------------------------------------------------------------------------------
ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
BARCLAYS PRIVATE BANK LIMITED
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ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
59/60 Grosvenor Street
London, WIX 9DA England
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ITEM 2(C).      CITIZENSHIP
England
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ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
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ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
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ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
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ITEM 2(A).      NAME OF PERSON(S) FILING
BRONCO (BARCLAYS CAYMAN) LIMITED
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ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
Walker House Mary Street PO Box 908 GT
George Town, Grand Cayman (Cayman Islands)
------------------------------------------------------------------------------          
ITEM 2(C).      CITIZENSHIP
Cayman Islands
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
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ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
PALOMINO LIMITED
------------------------------------------------------------------------------
ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
Walker House Mary Street PO Box 908 GT
George Town, Grand Cayman (Cayman Islands)
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ITEM 2(C).      CITIZENSHIP
Cayman Islands
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A).      NAME OF ISSUER
Enzon Inc       
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ITEM 1(B).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
C/O DORSEY & WHITNEY LLP, 250 PARK AVE  
NEW YORK, NY 10177
------------------------------------------------------------------------------
ITEM 2(A).      NAME OF PERSON(S) FILING
HYMF INC
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ITEM 2(B).      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
200 Park Avenue
New York, NY 10166
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ITEM 2(C).      CITIZENSHIP
U.S.A.
------------------------------------------------------------------------------
ITEM 2(D).      TITLE OF CLASS OF SECURITIES
COM
------------------------------------------------------------------------------
ITEM 2(E).      CUSIP NUMBER
293904108
------------------------------------------------------------------------------
ITEM 3.         IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 
13D-2(B), CHECK WHETHER THE PERSON FILING IS A

(a) //  Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) //  Bank as defined in section 3(a) (6) of the Act (15 U.S.C. 78c).
(c) //  Insurance Company as defined in section 3(a) (19) of the Act 
(15 U.S.C. 78c).
(d) //  Investment Company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) //  Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) //  Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) //  Parent Holding Company or control person in accordance with section 
240.13d-1(b)(1)(ii)(G).
(h) //  A savings association as defined in section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813).
(i) //  A church plan that is excluded from the definition of an investment
company under section 3(c)(14) of the Investment Company Act of 1940
(15U.S.C. 80a-3).
(j) //  Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 4. OWNERSHIP 

Provide the following information regarding the aggregate number and 
percentage of the class of securities of the issuer identified in Item 1.

(a)  Amount Beneficially Owned:                 
56,203
------------------------------------------------------------------------------

(b)  Percent of Class:
0.13%
------------------------------------------------------------------------------

(c)  Number of shares as to which such person has:
(i)   sole power to vote or to direct the vote
56,203
----------------------------------------------------------------
(ii)  shared power to vote or to direct the vote
-
----------------------------------------------------------------
(iii) sole power to dispose or to direct the disposition of
56,203
----------------------------------------------------------------
(iv) shared power to dispose or to direct the disposition of
-
----------------------------------------------------------------

As a result of disaggregation of certain subsidiaries of Barclays Bank PLC as
of December 31, 2005, the aggregate number and percentage reported may 
vary significantly from prior reported holdings.

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
If this statement is being filed to report the fact that as of the date hereof
the reporting person has ceased to be the beneficial owner of more than five
percent of the class of securities, check the following. /X/
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
The shares reported are held by the company in trust accounts for the 
economic benefit of the beneficiaries of those accounts.  See also
Items 2(a) above.
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
Not applicable
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
Not applicable
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
Not applicable

ITEM 10.        CERTIFICATION

(a) The following certification shall be included if the statement
is filed pursuant to section 240.13d-1(b):

By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired and
are held in the ordinary course of business and were not 
acquired and are not held for the purpose of or with the effect 
of changing or influencing the control of the issuer of the 
securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose
or effect.

(b) The following certification shall be included if the statement
is filed pursuant to section 240.13d-1(c):

By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above were not acquired
and are not held for the purpose of or with the effect of 
changing or influencing the control of the issuer of the 
securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose
or effect.

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

February 14, 2006
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Date                    

---------------------------------------
Signature

Patrick Gonsalves                                                                               Deputy Secretary, Barclays PLC
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Name/Title