Allied World Schedules Second Quarter 2009 Earnings Announcement and Conference Call

PEMBROKE, Bermuda -

Allied World Assurance Company Holdings, Ltd (NYSE: AWH) today announced that it will release its financial results for the second quarter ended June 30, 2009, after the close of market on Thursday, August 6, 2009.

Scott Carmilani, President and Chief Executive Officer, and Joan Dillard, Chief Financial Officer, will host a conference call on Friday, August 7, 2009, at 8:30 am (Eastern Time) to discuss the second quarter 2009 financial results. This call will include a question and answer session.

The conference call can be accessed by dialing 1-866-713-8563 (U.S. and Canada callers) or +1-617-597-5311 (international callers) and entering the passcode 90724924 approximately ten minutes prior to the call. A live webcast of the call will be available online at www.awac.com. A replay of the call will be available through Friday, August 21, 2009 by dialing 1-888-286-8010 (U.S. and Canada callers) or +1-617-801-6888 (international callers) and entering the passcode 76678076. In addition, the webcast will remain available online through Friday, August 21, 2009 at www.awac.com.

About Allied World Assurance Company

Allied World Assurance Company Holdings, Ltd, through its subsidiaries, is a global provider of innovative property, casualty and specialty insurance and reinsurance solutions, offering superior client service through offices in Bermuda, the United States, Europe and Hong Kong. Our insurance and reinsurance subsidiaries are rated A (Excellent) by A.M. Best Company. For further information on Allied World, please visit our website at www.awac.com.

Source: Allied World Assurance Company Holdings, Ltd

Media, Faye Cook, Vice President, Marketing & Communications, +1-646-794-0543, faye.cook at awac.com; or investors, Keith J. Lennox, Investor Relations Officer, +1-646-794-0750, keith.lennox at awac.com, both of Allied World Assurance Company Holdings