X0304 4 2012-02-26 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001473976 D'Orazio Frank ALLIED WORLD ASSURANCE CO. HOLDINGS AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 Pres. Bda & Int'l Ins., AWAC Common Shares 2012-02-26 4 M 0 1000 0.00 A 49726 D Common Shares 2012-02-26 4 D 0 500 67.7636 D 49226 D Restricted Stock Units 2012-02-26 4 M 0 1000 D Coimmon Shares 1000 6928 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) of such Restricted Stock Units. The Restricted Stock Units vest in four equal annual installments with the first installment vesting on February 26, 2010. The number represents the cash portion of the above award and the price per share was determined using the daily volume-weighted average sales price of the Company's Common Shares for the five consecutive trading days prior to February 26, 2012. /s/ Wesley D. Dupont, by Power of Attorney 2012-02-28