X0306 4 2017-02-17 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 2017-02-17 4 M 0 1605 0.00 A 16476 D Common Shares 2017-02-17 4 D 0 642 53.3743 D 15834 D Common Shares 2017-02-17 4 F 0 520 53.52 D 15314 D Common Shares 2017-02-18 4 M 0 1848 0.00 A 17162 D Common Shares 2017-02-18 4 D 0 924 53.3743 D 16238 D Common Shares 2017-02-18 4 F 0 444 53.52 D 15794 D Common Shares 2017-02-19 4 M 0 1656 0.00 A 17450 D Common Shares 2017-02-19 4 D 0 1656 53.3743 D 15794 D Restricted Stock Units 2017-02-17 4 M 0 1605 D Common Shares 1605 14460 D Restricted Stock Units 2017-02-18 4 M 0 1848 D Common Shares 1848 12612 D Restricted Stock Units 2017-02-19 4 M 0 1656 D Common Shares 1656 10956 D On February 17, 2015, the reporting person was granted 6,420 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 3,852 common shares and (ii) cash equal to the market value of 2,568 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. Includes 645 common shares acquired on June 30, 2016 and 31 common shares acquired on December 31, 2016 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, 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. On February 18, 2014, the reporting person was granted 7,404 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 3,702 common shares and (ii) cash equal to the market value of 3,702 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 prior to February 18, 2017. On February 19, 2013, the reporting person was granted 6,621 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 6,621 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. The fair market value was determined using the daily volume-weighted average sales price of the common shares for the five consecutive trading days prior to February 19, 2017. 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. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 19, 2014. /s/ Theodore Neos, by Power of Attorney 2017-02-22