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 *
Steffen Christopher J
  2. Issuer Name and Ticker or Trading Symbol
PLATINUM UNDERWRITERS HOLDINGS LTD [PTP]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O PLATINUM UNDERWRITERS HOLDINGS, LTD., WATERLOO HOUSE, 100 PITTS BAY ROAD
3. Date of Earliest Transaction (Month/Day/Year)
03/02/2015
(Street)

PEMBROKE, D0 HM 08
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 Shares 03/02/2015   D   10,001 (1) D $ 66 (2) (3) 0 D  

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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
Share Units (3) (4) 03/02/2015   D     803 (1)   (3)(4)   (3)(4) Common Shares 803 $ 66 (3) (4) 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Steffen Christopher J
C/O PLATINUM UNDERWRITERS HOLDINGS, LTD.
WATERLOO HOUSE, 100 PITTS BAY ROAD
PEMBROKE, D0 HM 08
  X      

Signatures

 /s/ Molly E. Gardner, Attorney-in-fact   03/02/2015
**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) Disposed of in connection with the Agreement and Plan of Merger ("Merger Agreement") between the Issuer, RenaissanceRe Holdings Ltd. ("RenaissanceRe") and Port Holdings Ltd., dated as of November 23, 2014.
(2) Pursuant to the terms of the Merger Agreement, upon closing of the merger, these Common Shares will be cancelled and the holder will receive, per their election, an amount equal to $66.00 in cash per each Common Share, subject to proration.
(3) This consideration amount is subject to adjustment due to possible proration calculations provided for in the Merger Agreement. Specifically, the cash election consideration is subject to proration if the un-prorated aggregate share consideration is less than 7,500,000 RenaissanceRe common shares, and the share election consideration is subject to proration if the un-prorated aggregate share consideration is greater than 7,500,000 RenaissanceRe common shares. This proration calculation has not been finalized as of the date of this Form 4 and thus it is not possible to determine the exact amount of consideration to be received by the reporting person as of the date of this Form 4. Once the exact amount of consideration is determined, the reporting person will file an amendment to this Form 4, if necessary.
(4) Pursuant to the terms of the Merger Agreement, upon closing of the merger, these Share Units will be cancelled and the holder will receive, per their election, an amount equal to $66.00 in cash per each Common Share underlying each Share Unit, subject to proration.

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