X0306 4 2016-02-19 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001543666 McElroy John Justin ALLIED WORLD ASSURANCE CO. HOLDINGS, AG GUBELSTRASSE 24, PARK TOWER, 15TH FLOOR ZUG V8 6300 SWITZERLAND 0 1 0 0 COO Common Shares 2016-02-19 4 M 0 1434 0.00 A 12846 D Common Shares 2016-02-19 4 D 0 1434 31.2186 D 11412 D Common Shares 76917 I By Trust Restricted Stock Units 2016-02-19 4 M 0 1434 D Common Shares 1434 8656 D On February 19, 2013, the reporting person was granted 5,739 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 5,739 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 up to and including February 19, 2016. Represents shares held by an irrevocable trust for the benefit of the reporting person's children. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 19, 2014. 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 2016-02-23