X0306 4 2014-02-22 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001456268 Gauthier John J ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 EVP & CIO, AWAC ServCo. Common Shares 2014-02-22 4 M 0 585 0.00 A 19354 D Common Shares 2014-02-22 4 M 0 304 0.00 A 19658 D Common Shares 2014-02-22 4 M 0 1100 0.00 A 20758 D Common Shares 2014-02-22 4 D 0 1060 99.8969 D 19698 D Common Shares 2014-02-22 4 F 0 500 99.55 D 19198 D Restricted Stock Units 2014-02-22 4 M 0 585 D Common Shares 585 6976 D Restricted Stock Units 2014-02-22 4 M 0 304 D Common Shares 304 6672 D Restricted Stock Units 2014-02-22 4 M 0 1100 D Common Shares 1100 5572 D On February 22, 2012, the reporting person was granted 2,340 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 468 common shares and (ii) cash equal to the market value of 1,872 common shares (measured at the date of vesting) of such Restricted Stock Units. On February 22, 2011, the reporting person was granted 1,220 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 610 common shares and (ii) cash equal to the market value of 610 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 4,400 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 2,640 common shares and (ii) cash equal to the market value of 1,760 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 common shares for the five consecutive trading days prior to February 22, 2014, which was on a Saturday. Exclusively represents shares withheld by the Company with respect to the payment of withholding tax liability incurred upon the vesting of Restricted Stock Units. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 22, 2013. Represents all Restricted Stock Units held by the reporting person that vest in whole or in part in cash. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 22, 2012. The Restricted Stock Units vested in four equal installments with the first installment vesting on February 22, 2011. /s/ Wayne H. Datz, by Power of Attorney 2014-02-25