X0303 4 2010-02-26 0 0001163348 ALLIED WORLD ASSURANCE CO HOLDINGS LTD AWH 0001368328 Dupont Wesley D ALLIED WORLD ASSURANCE CO HOLDINGS, LTD 27 RICHMOND ROAD PEMBROKE D0 HM 08 BERMUDA 0 1 0 0 EVP, Gen. Counsel & Corp. Sec. Common Shares 2010-02-26 4 M 0 1000 0.00 A 67143 D Common Shares 2010-02-26 4 D 0 500 46.1354 D 66643 D Restricted Stock Units 2010-02-26 4 M 0 1000 D 2010-02-26 2013-02-26 Common Shares 500 6500 D On February 26, 2009, the reporting person was granted 4,000 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 2,000 of the Company's Common Shares and (ii) cash equal to the market value of 2,000 Common Shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. The fair market value of the cash portion of the grant was determined using the daily volume-weighted average sales price of the Company's Common Shares for the five consecutive trading days up to and including February 26, 2010. The Restricted Stock Units vest in four equal annual installments with the first installment vesting on February 26, 2010. /s/ Wayne H. Datz, by Power of Attorney 2010-03-02