X0306 4 2014-02-18 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 2014-02-18 4 A 0 5506 0.00 A 64123 D Common Shares 2014-02-19 4 M 0 588 0.00 A 64711 D Common Shares 2014-02-19 4 D 0 588 100.1271 D 64123 D Restricted Stock Units 2014-02-18 4 A 0 1974 A Common Shares 1974 8249 D Restricted Stock Units 2014-02-19 4 M 0 588 D Common Shares 588 7661 D Represents the Company's common shares that were earned pursuant to a 2011 performance-based award for no monetary consideration and which vested at 130% 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 2004 Stock Incentive Plan. On February 19, 2013, the reporting person was granted 2,354 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 2,354 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. 1,974 Restricted Stock Units convert into (i) 987 common shares and (ii) cash equal to the market value of 987 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