X0306 4 2014-02-22 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001368328 Dupont Wesley D ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 EVP & General Counsel Common Shares 2014-02-22 4 M 0 878 0.00 A 63341 D Common Shares 2014-02-22 4 M 0 430 0.00 A 63771 D Common Shares 2014-02-22 4 M 0 875 0.00 A 64646 D Common Shares 2014-02-22 4 D 0 1267 99.8969 D 63379 D Common Shares 2014-02-22 4 F 0 533 99.55 D 62846 D Restricted Stock Units 2014-02-22 4 M 0 878 D Common Shares 878 8166 D Restricted Stock Units 2014-02-22 4 M 0 430 D Common Shares 430 7736 D Restricted Stock Units 2014-02-22 4 M 0 875 D Common Shares 875 6861 D On February 22, 2012, the reporting person was granted 3,510 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 702 common shares and (ii) cash equal to the market value of 2,808 common shares (measured at the date of vesting) of such Restricted Stock Units. On February 22, 2011, the reporting person was granted 1,720 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 860 common shares and (ii) cash equal to the market value of 860 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 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 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