X0306 4 2013-02-19 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 2013-02-19 4 A 0 8034 0.00 A 57260 D Restricted Stock Units 2013-02-19 4 A 0 2354 A Common Shares 2354 2354 D Represents the Company's Common Shares that were earned pursuant to a 2010 performance-based award for no monetary consideration and which vested at 103% 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. Grant of Restricted Stock Units for no monetary consideration. 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 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 2013-02-21