X0306 4 2014-02-22 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001368443 Carmilani Scott A ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 1 1 0 0 President, CEO and Chairman Common Shares 2014-02-22 4 M 0 5655 0.00 A 387683 D Common Shares 2014-02-22 4 M 0 2954 0.00 A 390637 D Common Shares 2014-02-22 4 M 0 3250 0.00 A 393887 D Common Shares 2014-02-22 4 D 0 7301 99.8969 D 386586 D Common Shares 2014-02-22 4 F 0 2465 99.55 D 384121 D Common Shares 43000 I By Trust Restricted Stock Units 2014-02-22 4 M 0 5655 D Common Shares 5655 47580 D Restricted Stock Units 2014-02-22 4 M 0 2954 D Common Shares 2954 44626 D Restricted Stock Units 2014-02-22 4 M 0 3250 D Common Shares 3250 41376 D On February 22, 2012, the reporting person was granted 22,618 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 4,524 common shares and (ii) cash equal to the market value of 18,094 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. On February 22, 2011, the reporting person was granted 11,820 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 5,910 common shares and (ii) cash equal to the market value of 5,910 common shares (measured at the date of vesting) of such Restricted Stock Units. On February 22, 2010, the reporting person was granted 13,000 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 7,800 common shares and (ii) cash equal to the market value of 5,200 common shares (measured at the date of 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 22, 2014, which was on a Saturday. Exclusively represents shares withheld by the Company with respect to the payment of withholding tax liability incurred upon the vesting of Restricted Stock Units. Represents 43,000 shares held by an irrevocable trust for the benefit of the the reporting person's spouse and children. The Restricted Stock Units vest in four equal installments with the first installment vesting on February 22, 2013. Represents all 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 22, 2012. The Restricted Stock Units vested in four equal installments with the first installment vesting on February 22, 2011. /s/ Wayne H. Datz, by Power of Attorney 2014-02-25