X0306 4 2014-02-22 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001543666 McElroy John Justin ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 COO Common Shares 2014-02-22 4 M 0 561 0.00 A 27333 D Common Shares 2014-02-22 4 M 0 292 0.00 A 27625 D Common Shares 2014-02-22 4 M 0 1000 0.00 A 28625 D Common Shares 2014-02-22 4 D 0 1595 99.8969 D 27030 D Common Shares 2014-02-22 4 F 0 126 99.55 D 26904 D Restricted Stock Units 2014-02-22 4 M 0 561 D Common Shares 561 5746 D Restricted Stock Units 2014-02-22 4 M 0 292 D Common Shares 292 5454 D Restricted Stock Units 2014-02-22 4 M 0 1000 D Common Shares 1000 4454 D On February 22, 2012, the reporting person was granted 2,242 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 448 common shares and (ii) cash equal to the market value of 1,794 common shares (measured at the date of vesting) of such Restricted Stock Units. On February 22, 2011, the reporting person was granted 1,170 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 585 common shares and (ii) cash equal to the market value of 585 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 4,000 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 4,000 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