X0306 4 2017-02-22 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001473976 D'Orazio Frank ALLIED WORLD ASSURANCE CO. HOLDINGS AG GUBELSTRASSE 24, PARK TOWER, 15TH FLOOR ZUG V8 6300 SWITZERLAND 0 1 0 0 Pres. U/W & Global Risk Common Shares 2017-02-22 4 M 0 1472 0.00 A 211463 D Common Shares 2017-02-22 4 D 0 294 53.3769 D 211169 D Common Shares 2017-02-22 4 F 0 565 53.12 D 210604 D Restricted Stock Units 2017-02-22 4 M 0 1472 D Common Shares 1472 8792 D On February 22, 2016, the reporting person was granted 5,892 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 4,714 common shares 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 fair market value of the cash portion 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 22, 2017. Exclusively represents shares withheld by the Company with respect to the payment of withholding tax liability incurred upon the vesting of 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 2017-02-24