X0306 4 2013-02-19 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001198917 BRADLEY THOMAS A ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 EVP & CFO Restricted Stock Units 2013-02-19 4 A 0 2207 A Common Shares 2207 2207 D Grant of Restricted Stock Units for no monetary consideration. Restricted Stock Units convert into cash equal to the market value of 2,207 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