X0306 4 2013-03-15 0 0001171500 PLATINUM UNDERWRITERS HOLDINGS LTD PTP 0001490253 Decleir Allan Carl PLATINUM UNDERWRITERS HOLDINGS, LTD. 69 PITTS BAY ROAD, 2ND FLOOR PEMBROKE D0 HM 08 BERMUDA 0 1 0 0 EVP & Chief Financial Officer Common Shares 2013-03-15 4 M 0 4970 0.00 A 30325 D Share units 2013-03-15 4 M 0 4970 0.00 D Common Shares 4970 0 D 1-for-1 These share units were awarded on February 13, 2013 pursuant to the Amended and Restated Annual Incentive Plan of Platinum Underwriters Holdings, Ltd. (the "Company"). The share units were fully vested on the date of grant 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/ Christina M. Parker, Attorney in Fact 2013-03-15