Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
RIKER WILLIAM I
   2. Issuer Name and Ticker or Trading Symbol
RENAISSANCERE HOLDINGS LTD [RNR] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President
(Last)
(First)
(Middle)
RENAISSANCE HOUSE, 8-20 EAST BROADWAY		 3. Date of Earliest Transaction (Month/Day/Year)
03/24/2005
(Street)

PEMBROKE HM 19, BERMUDA 		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock               560,321 D  
Common Stock 03/24/2005   M   34,895 A $ 39.76 103,911 I by Partnership (1)
Common Stock 03/24/2005   F   30,367 D $ 48.06 73,544 I by Partnership (1)
Common Stock 03/24/2005   M   2,324 A $ 42.69 75,868 I by Partnership (1)
Common Stock 03/24/2005   F   2,128 D $ 48.06 73,740 I by Partnership (1)
Common Stock               4,668 I by Spouse
Common Stock               605 I by Trust (2)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-qualified Stock Option (right to buy) $ 39.76 03/24/2005   M     25,954 12/26/2002 03/25/2005 Common Stock 25,954 (3) 0 I by Partnership (1)
Non-qualified Stock Option (right to buy) $ 39.76 03/24/2005   M     8,941 12/26/2002 03/26/2005 Common Stock 8,941 (3) 0 I by Partnership (1)
Non-qualified Stock Option (right to buy) $ 42.69 03/24/2005   M     2,324 10/28/2002 03/26/2005 Common Stock 2,324 (3) 0 I by Partnership (1)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
RIKER WILLIAM I
RENAISSANCE HOUSE
8-20 EAST BROADWAY
PEMBROKE HM 19, BERMUDA 		   X     President  

Signatures

 /s/ Stephen H. Weinstein, Attorney-in-fact   03/28/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) These securities are owned and controlled by a family limited partnership for the benefit of immediate family members of the reporting person and may be deemed to be beneficially owned by the reporting person.
(2) These securities are owned and controlled by a trust for the benefit of immediate family members of the reporting person and may be deemed to be beneficially owned by the reporting person.
(3) Not Applicable.
 
Remarks:
* The transactions reported hereby relate to the exercise of employee stock options originally granted to the Reporting 
Person in 1995 with a ten year term, and accordingly would have expired if not exercised by March 26, 2005.

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