X0306 4 2014-09-29 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 2014-09-29 4 M 0 10000 10.90 A 1162363 D Common Shares 2014-09-29 4 S 0 10000 36.891 D 1152363 D Common Shares 129000 I By Trust Common Shares 10.90 2014-09-29 4 M 0 10000 0.00 D 2006-01-03 2015-01-03 Common Shares 10000 50000 D Reflects the issuer's 3-for-1 stock split paid on May 23, 2014. The exercise of Employee Stock Options and sale of Common Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 28, 2014. The options exercised and sold were due to expire on January 3, 2015. Represents a weighted average sale price: the sales prices range from $36.8150 to $36.98. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the U.S. Securities Exchange Commission, the issuer or a security holder of the issuer. Represents 129,000 shares held by an irrevocable trust for the benefit of the reporting person's spouse and children. The exercise price and 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 2014-10-01