Exhibit 32.2

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, William A. Robbie, Executive Vice President, Chief Financial Officer and
Treasurer of Platinum Underwriters Holdings, Ltd., hereby certify to the best of
my knowledge and belief that this Quarterly Report on Form 10-Q fully complies
with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act
of 1934 (15 U.S.C. 78m(a) or 78o(d)) and that the information contained in this
Quarterly Report on Form 10-Q fairly represents, in all material respects, the
financial condition and results of operations of Platinum Underwriters Holdings,
Ltd.

Date: August 13, 2003       /s/ WILLIAM A. ROBBIE
                          ------------------------------------------------------
                            By: William A. Robbie
                            Executive Vice President and Chief Financial Officer