Allied World Schedules Third Quarter 2009 Earnings Announcement and Conference Call

PEMBROKE, Bermuda, Oct. 7 /PRNewswire-FirstCall/ — Allied World Assurance
Company Holdings, Ltd (NYSE: AWH) today announced that it will release its
financial results for the third quarter ended September 30, 2009, after the
close of market on Thursday, November 5, 2009.

Scott Carmilani, President and Chief Executive Officer, and Joan Dillard,
Chief Financial Officer, will host a conference call on Friday, November 6,
2009, at 8:30 am (Eastern Time) to discuss the third quarter 2009 financial
results. This call will include a question and answer session.

The conference call can be accessed by dialing (800) 510-9836 (U.S. and
Canada callers) or (617) 614-3670 (international callers) and entering the
passcode 92163598 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 20, 2009 by dialing (888) 286-8010
(U.S. and Canada callers) or (617) 801-6888 (international callers) and
entering the passcode 71145005. In addition, the webcast will remain
available online through Friday, November 20, 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