Allied World Schedules Fourth Quarter 2010 Earnings Announcement and Conference Call

ZUG, Switzerland, January 11, 2011 - Allied World Assurance Company Holdings, AG (NYSE: AWH) today announced
that it will release its financial results for the fourth quarter and for the
year ended December 31, 2010, after the close of market on Thursday, February
17, 2011.

Scott Carmilani, President and Chief Executive Officer, and Joan Dillard,
Chief Financial Officer, will host a conference call on Friday, February 18,
2011 at 9:00 am (Eastern Time) to discuss the fourth quarter and year end
2010 financial results. This call will include a question and answer session.

The conference call can be accessed by dialing 877-317-6701 (U.S. and
Canada callers) or +1-412-317-6701 (international callers) and entering the
passcode 8832831 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, March 4, 2011 by dialing
877-344-7529 (U.S. and Canada callers) or +1-412-317-0088 (international
callers) and entering the passcode 447223. In addition, the webcast will
remain available online through Friday, March 4, 2011 at www.awac.com.

About Allied World Assurance Company

Allied World Assurance Company Holdings, AG, through its subsidiaries, is
a global provider of innovative property, casualty and specialty insurance
and reinsurance solutions, offering superior client service through a global
network of branches and affiliates. Our insurance and reinsurance
subsidiaries are rated A (Excellent) by A.M. Best Company, and our Lloyd's
Syndicate 2232 is rated A+ (Strong) by Standard & Poor's and Fitch. Please
visit our website at www.awac.com for further information on Allied
World.

Media: Faye Cook, VP, Marketing & Communications, +1-441-278-5406, faye.cook at awac.com; Investors: Keith J. Lennox, Investor Relations Officer, +1-646-794-0750, keith.lennox at awac.com