X0306 4 2016-02-17 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001456268 Gauthier John J ALLIED WORLD ASSURANCE CO. HOLDINGS, AG GUBELSTRASSE 24, PARK TOWER, 15TH FLOOR ZUG V8 6300 SWITZERLAND 0 1 0 0 EVP & CIO Common Shares 2016-02-17 4 M 0 1443 0.00 A 68031 D Common Shares 2016-02-17 4 D 0 577 31.0281 D 67454 D Common Shares 2016-02-17 4 F 0 384 31.04 D 67070 D Common Shares 2016-02-18 4 M 0 1668 0.00 A 68738 D Common Shares 2016-02-18 4 D 0 834 31.0346 D 67904 D Common Shares 2016-02-18 4 F 0 347 31.82 D 67557 D Restricted Stock Units 2016-02-17 4 M 0 1443 D Common Shares 1443 14841 D Restricted Stock Units 2016-02-18 4 M 0 1668 D Common Shares 1668 13173 D On February 17, 2015, the reporting person was granted 5,778 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 3,467 common shares and (ii) cash equal to the market value of 2,311 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. Includes 436 common shares acquired on June 30, 2015 pursuant to the Company's Amended and Restated 2008 Employee Share Purchase Plan. 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 17, 2016. Exclusively represents shares withheld by the Company with respect to the payment of withholding tax liability incurred upon the vesting of Restricted Stock Units. On February 18, 2014, the reporting person was granted 6,660 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 3,330 common shares and (ii) cash equal to the market value of 3,330 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 18, 2016. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 17, 2016. Represents Restricted Stock Units held by the reporting person that vest in whole or in part in cash. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 18, 2015. /s/ Theodore Neos, by Power of Attorney 2016-02-19