X0304 4 2012-02-22 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 2012-02-22 4 A 0 13500 0.00 A 48025 D Common Shares 2012-02-22 4 M 0 352 0.00 A 48377 D Common Shares 2012-02-22 4 M 0 875 0.00 A 49252 D Common Shares 2012-02-22 4 D 0 526 66.8906 D 48726 D Restricted Stock Units 2012-02-22 4 M 0 352 D Common Shares 352 5683 D Restricted Stock Units 2012-02-22 4 M 0 875 D Common Shares 875 4808 D Restricted Stock Units 2012-02-22 4 A 0 3126 A Common Shares 3126 7934 D Represents the Company's Common Shares that were earned pursuant to a 2009 LTIP award for no monetary consideration and which vested at 150% of target based on the achievement of pre-established performance criteria during the applicable three-year performance period established under the Company's Third Amended and Restated Long-Term Incentive Plan. On February 22, 2011, the reporting person was granted 1,410 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 705 of the Company's Common Shares and (ii) cash equal to the market value of 705 Common Shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. On February 22, 2010, the reporting person was granted 3,500 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 2,100 of the Company's Common Shares and (ii) cash equal to the market value of 1,400 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 22, 2012. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 22, 2012. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 22, 2011. Grant of Restricted Stock Units for no monetary consideration. 3,126 Restricted Stock Units convert into (i) 625 Common Shares of the Company and (ii) cash equal to the market value of 2,501 Common Shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 22, 2013. /s/ Wesley D. Dupont, by Power of Attorney 2012-02-23