X0303 4 2010-02-26 0 0001163348 ALLIED WORLD ASSURANCE CO HOLDINGS LTD AWH 0001368326 Grossack Marshall J ALLIED WORLD ASSURANCE CO HOLDINGS, LTD 27 RICHMOND ROAD PEMBROKE, BERMUDA D0 HM 08 BERMUDA 0 1 0 0 EVP, Chief Actuary Common Shares 2010-02-26 4 M 0 624 0.00 A 51916 D Common Shares 2010-02-26 4 D 0 312 46.1354 D 51604 D Restricted Stock Units 2010-02-26 4 M 0 624 D 2010-02-26 2013-02-26 Common Shares 312 5176 D On February 26, 2009, the reporting person was granted 2,500 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 1,250 of the Company's Common Shares and (ii) cash equal to the market value of 1,250 Common Shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. The fair market value of the cash portion 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/ Wesley D. Dupont, by Power of Attorney 2010-03-02