X0306 4 2014-02-18 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001598093 Iglesias Louis ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 President, AW North America Common Shares 2014-02-19 4 M 0 1103 0.00 A 3042 D Common Shares 2014-02-19 4 D 0 1103 100.1271 D 1939 D Restricted Stock Units 2014-02-18 4 A 0 2098 A Common Shares 2098 6512 D Restricted Stock Units 2014-02-19 4 M 0 1103 D Common Shares 1103 5409 D On February 19, 2013, the reporting person was granted 4,414 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 4,414 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. The fair market value was determined using the daily volume-weighted average sales price of the common shares for the five consecutive trading days up to and including February 19, 2014. Grant of Restricted Stock Units for no monetary consideration. 2,098 Restricted Stock Units convert into (i) 1,049 common shares and (ii) cash equal to the market value of 1,049 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 18, 2015. Represents 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 19, 2014. /s/ Wayne H. Datz, by Power of Attorney 2014-02-20