X0306 4 2017-02-17 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001368326 Grossack Marshall J ALLIED WORLD ASSURANCE CO. HOLDINGS, AG GUBELSTRASSE 24, PARK TOWER, 15TH FLOOR ZUG V8 6300 SWITZERLAND 0 1 0 0 EVP, Chief Actuary Common Shares 2017-02-17 4 M 0 763 0.00 A 209234 D Common Shares 2017-02-17 4 D 0 305 53.3743 D 208929 D Common Shares 2017-02-17 4 F 0 236 53.52 D 208693 D Common Shares 2017-02-18 4 M 0 876 0.00 A 209569 D Common Shares 2017-02-18 4 D 0 438 53.3743 D 209131 D Common Shares 2017-02-18 4 F 0 226 53.52 D 208905 D Common Shares 2017-02-19 4 M 0 2208 0.00 A 211113 D Common Shares 2017-02-19 4 D 0 2208 53.3743 D 208905 D Restricted Stock Units 2017-02-17 4 M 0 763 D Common Shares 763 8372 D Restricted Stock Units 2017-02-18 4 M 0 876 D Common Shares 876 7496 D Restricted Stock Units 2017-02-19 4 M 0 2208 D Common Shares 2208 5288 D On February 17, 2015, the reporting person was granted 3,050 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 1,830 common shares and (ii) cash equal to the market value of 1,220 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. Includes 675 common shares acquired on June 30, 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 3,516 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 1,758 common shares and (ii) cash equal to the market value of 1,758 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 8,829 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 8,829 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