U.S. Securities and Exchange Commission                   
                                                                               
                             Washington, D.C. 20549                            
                                                                               
                                    FORM F-N                                   
                                                                               
          APPOINTMENT OF AGENT FOR SERVICE OF PROCESS BY FOREIGN BANKS         
          AND FOREIGN INSURANCE COMPANIES AND CERTAIN OF THEIR HOLDING         
          COMPANIES AND FINANCE SUBSIDIARIES MAKING PUBLIC OFFERINGS OF        
                         SECURITIES IN THE UNITED STATES                       
                                                                               
                                                                               
                                                                               
A.           Name of issuer or person filing ("Filer"): Platinum Underwriters  
             Holdings, Ltd.                                                    
                                                                               
B.           This is (select one):                                             
                                                                               
             |X|  an original filing for the Filer                             
                                                                               
             |_|  an amended filing for the Filer                              
                                                                               
C.           Identify the filing in conjunction with which this Form is being  
             filed: S-3                                                        
                                                                               
             Name of registrant: Platinum Underwriters Holdings, Ltd.          
                                                                               
             Form type: S-3                                                    
                                                                               
             File Number (if known) No. 333-129182                             

             Filed by: Platinum Underwriters Holdings, Ltd.                    

             Date Filed (if filed concurrently, so indicate): October 21, 2005 

D.           The Filer is incorporated or organized under the laws of (Name of 
             the jurisdiction under whose laws the filer is organized or       
             incorporated)                                                     
                                                                               
             Bermuda                                                           
                                                                               
             and has its principal place of business at (Address in full and   
             telephone number)                                                 
                                                                               
             The Belvedere Building, 69 Pitts Bay Road, Pembroke, Bermuda HM 08
             telephone number: (441) 295-7195                                  
                                                                               


E.           The Filer designates and appoints (Name of United States person
             serving as agent)

             CT CORPORATION SYSTEM ("Agent") located at 111 Eighth Avenue, New
             York, New York 10011, (212) 894-8940 as the agent of the Filer upon
             whom may be served any process, pleadings, subpoenas, or other
             papers in:

             (a) any investigation or administrative proceeding conducted by the
                 Commission, and

             (b) any civil suit or action brought against the Filer or to which
                 the Filer has been joined as defendant or respondent in any
                 appropriate court in any place subject to the jurisdiction of
                 any state or of the United States or any of its territories or
                 possessions or of the District of Columbia, arising out of or
                 based on any offering made or purported to be made in
                 connection with the securities registered by the Filer on Form
                 S-3 filed on October 21, 2005 or any purchases or sales of any
                 security in connection therewith. The Filer stipulates and
                 agrees that any such civil suit or action or administrative
                 proceeding may be commenced by the service of process upon, and
                 that service of an administrative subpoena shall be effected by
                 service upon, such agent for service of process, and that the
                 service as aforesaid shall be taken and held in all courts and
                 administrative tribunals to be valid and binding as if personal
                 service thereof had been made.


F.           Each person filing this Form stipulates and agrees to appoint a
             successor agent for service of process and file an amended Form F-N
             if the Filer discharges the Agent or the Agent is unwilling or
             unable to accept service on behalf of the Filer at any time until
             six years have elapsed from the date of the Filer's last
             registration statement or report, or amendment to any such
             registration statement or report, filed with the Commission under
             the Securities Act of 1933 or Securities Exchange Act of 1934.
             Filer further undertakes to advise the Commission promptly of any
             change to the Agent's name or address during the applicable period
             by amendment of this form referencing the file number of the
             relevant registration form in conjunction with which the amendment
             is being filed.

G.           Each person filing this form undertakes to make available, in
             person or by telephone, representatives to respond to inquiries
             made by the Commission staff, and to furnish promptly, when
             requested to do so by the Commission staff, information relating to
             the securities registered pursuant to the form referenced in
             paragraph E or transactions in said securities.

             The Filer certifies that it has duly caused this power of attorney,
             consent, stipulation and agreement to be signed on its behalf by
             the undersigned, thereunto duly authorized, in the City of
             Pembroke, Country of Bermuda this 1st day of November, 2005 A.D.
             
             Filer: Platinum Underwriters Holdings, Ltd.

             By :  /s/ Joseph F. Fisher
                   -----------------------------
                   Joseph F. Fisher
                   Executive Vice President
                   and Chief Financial Officer


This statement has been signed by the following persons in the capacities and on
the dates indicated.

                                          CT CORPORATION SYSTEM


                                          By: /s/ Jennifer Sodeno
                                              -----------------------------
                                          Name:  Jennifer Sodeno
                                          Title: Dept. Manager

                                          Date:  November 1, 2005