X0206 3 2013-02-25 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001584980 Zielger Kent W ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 SVP, Finance & CAO Restricted Stock Units Common Shares 1141 D On February 25, 2013, the reporting person was granted 1,141 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 1,141 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 25, 2014. /s/ Kent W. Ziegler 2013-09-09