X0306 4 2014-12-09 0 0001163348 Allied World Assurance Co Holdings, AG AWH 0001368326 Grossack Marshall J ALLIED WORLD ASSURANCE CO. HOLDINGS, AG LINDENSTRASSE 8 BAAR/ZUG V8 CH-6340 SWITZERLAND 0 1 0 0 EVP, Chief Actuary Common Shares 2014-12-09 4 M 0 9999 10.90 A 212764 D Common Shares 2014-12-09 4 F 0 6346 37.77 D 206418 D Employee Stock Options (right to buy) 10.90 2014-12-09 4 M 0 9999 0.00 D 2006-01-03 2015-01-03 Common Shares 9999 0 D The Employee Stock Options exercised were due to expire on January 3, 2015. Reflects the issuer's 3-for-1 stock split paid on May 23, 2014. Includes 370 Common Shares acquired on June 30, 2014 pursuant to the Company's Amended and Restated 2008 Employee Share Purchase Plan. Exclusively represents shares withheld by the Company with respect to the payment of the exercise price of the Employee Stock Options and the related tax withholding liability incurred upon such exercise. The exercise price and the number of shares underlying the Employee Stock Options have been adjusted to reflect the issuer's 3-for-1 stock split paid on May 23, 2014. These securities vested in four equal annual installments with the first installment vesting on the date shown. /s/ Wayne H. Datz, by Power of Attorney 2014-12-11