X0306 4 2016-02-22 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001198917 BRADLEY THOMAS A ALLIED WORLD ASSURANCE CO. HOLDINGS, AG GUBELSTRASSE 24, PARK TOWER, 15TH FLOOR ZUG V8 6300 SWITZERLAND 0 1 0 0 EVP & CFO Common Shares 2016-02-22 4 A 0 8977 0.00 A 18580 D Common Shares 2016-02-22 4 F 0 4385 31.95 D 14195 D Restricted Stock Unit 2016-02-22 4 A 0 5892 A Common Shares 5892 16065 D Represents the Company's common shares that were earned pursuant to a 2013 performance-based award for no monetary consideration and which vested at 113% 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. Exclusively represents shares withheld by the Company with respect to the payment of withholding tax liability incurred upon the vesting of performance-based awards. Grant of Restricted Stock Units for no monetary consideration. Restricted Stock Units convert into (i) 4,714 common shares of the Company and (ii) cash equal to the market value of 1,178 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 22, 2017. Represents Restricted Stock Units held by the reporting person that vest in whole or in part in cash. /s/ Theodore Neos, by Power of Attorney 2016-02-24