Allied World Schedules Third Quarter 2010 Earnings Announcement and Conference Call

PEMBROKE, Bermuda, October 6, 2010 - Allied World Assurance Company Holdings, Ltd (NYSE: AWH) today announced
that it will release its financial results for the third quarter ended
September 30, 2010, after the close of market on Thursday, November 4, 2010.

Scott Carmilani, President and Chief Executive Officer, and Joan Dillard,
Chief Financial Officer, will host a conference call on Friday, November 5,
2010 at 8:00 am (Eastern Time) to discuss the third quarter 2010 financial
results. This call will include a question and answer session.

The conference call can be accessed by dialing (866)-843-0890 (U.S. and
Canada callers) or +1-(412)-317-9250 (international callers) and entering the
passcode 9988847 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, November 19, 2010 by dialing (877)-344-7529
(U.S. and Canada callers) or +1-(412)-317-0088 (international callers) and
entering the passcode 444951. In addition, the webcast will remain available
online through Friday, November 19, 2010 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 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 or Investors: Keith J. Lennox, Investor Relations Officer, +1-646-794-0750, keith.lennox at awac.com both of Allied World Assurance Company Holdings, Ltd