X0303 4 2009-03-25 0 0001171500 PLATINUM UNDERWRITERS HOLDINGS LTD PTP 0001370690 Krantz James A THE BELVEDERE BUILDING 69 PITTS BAY ROAD, 2ND FLOOR PEMBROKE D0 HM 08 BERMUDA 0 1 0 0 EVP & Chief Financial Officer Common Shares 2009-03-25 4 M 0 5432 0.00 A 45303 D Share units 2009-03-25 4 M 0 5432 0.00 D Common Shares 5432 0 D 1-for-1 These share units were awarded on February 23, 2009 pursuant to the Company's Amended and Restated Annual Incentive Plan. The share units were fully vested and were paid to the reporting person 30 days after the date of grant in the form of one Common Share of the Company for each share unit awarded to the reporting person. /s/ Michael E. Lombardozzi Attorney in Fact 2009-03-26