X0306 4 2015-02-17 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001598093 Iglesias Louis ALLIED WORLD ASSURANCE CO. HOLDINGS, AG GUBELSTRASSE 24, PARK TOWER, 15TH FLOOR ZUG V8 6300 SWITZERLAND 0 1 0 0 President, North America Common Shares 2015-02-18 4 M 0 1572 0.00 A 6795 D Common Shares 2015-02-18 4 D 0 786 40.4465 D 6009 D Common Shares 2015-02-18 4 F 0 311 40.65 D 5698 D Common Shares 2015-02-19 4 M 0 3312 0.00 A 9010 D Common Shares 2015-02-19 4 D 0 3312 40.5293 D 5698 D Restricted Stock Units 2015-02-17 4 A 0 5457 A Common Shares 5457 21684 D Restricted Stock Units 2015-02-18 4 M 0 1572 D Common Shares 1572 20112 D Restricted Stock Units 2015-02-19 4 M 0 3312 D Common Shares 3312 16800 D On February 18, 2014, the reporting person was granted 6,294 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 3,147 common shares and (ii) cash equal to the market value of 3,147 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. These Restricted Stock Units were previously reported as a grant of 2,098 Restricted Stock Units converting into (i) 1,049 common shares and (ii) cash equal to the market value of 1,049 common shares. These amounts have been adjusted to reflect the issuer's 3-for-1 stock split paid on May 23, 2014. Reflects the issuer's 3-for-1 stock split paid on May 23, 2014. 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, 2015. 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 19, 2013, the reporting person was granted 13,242 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into cash equal to the market value of 13,242 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. These Restricted Stock Units were previously reported as a grant of 4,414 Restricted Stock Units that convert into cash equal to the market value of the 4,414 common shares. The amount has been adjusted to reflect the issuer's 3-for-1 stock split paid on May 23, 2014. 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, 2015. Grant of Restricted Stock Units for no monetary consideration. Restricted Stock Units convert into (i) 3,274 common shares and (ii) cash equal to the market value of 2,183 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. 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/ Wayne H. Datz, by Power of Attorney 2015-02-19