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, Allan C. Decleir, Executive Vice President and Chief Financial Officer 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 presents, in all material respects, the financial condition and results of operations of Platinum Underwriters Holdings, Ltd.

Date: April 29, 2011	By:	/s/ Allan C. Decleir
		Allan C. Decleir
		Executive Vice President and Chief Financial Officer