Allied World's Syndicate 2232 Joins Lloyd's Asia Platform

PEMBROKE, Bermuda, July 20, 2010 - In addition to the recent launch of Syndicate 2232, Allied World
Assurance Company Holdings, Ltd (NYSE: AWH) announced today that approval has
been received from the Monetary Authority of Singapore (MAS) and Lloyd's Asia
to register and operate a service company, Capita 2232 Services Pte. Ltd. As
part of the Lloyd's Asia platform, the service company will underwrite
exclusively on behalf of Syndicate 2232. Lloyd's Asia was established in
Singapore in 1999 to give Lloyd's an underwriting base in Asia, and currently
enables approximately 18 syndicates to write local and offshore business from
Singapore.

Syndicate 2232, via the service company, will offer a broad range of
treaty products from Singapore, including property, casualty and specialty
lines, to clients in the Asia Pacific, Middle East and Africa regions.

Syndicate 2232 is managed by Capita Managing Agency Limited, a subsidiary
of The Capita Group PLC, which is authorized by Lloyd's and the Financial
Services Authority in the United Kingdom. Capita 2232 Services Pte. Ltd. is a
wholly-owned subsidiary of Capita Managing Agency Limited.

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, Europe, Hong Kong, Singapore and the United States. 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.

Cautionary Statement Regarding Forward-Looking Statements

Any forward-looking statements made in this press release reflect our
current views with respect to future events and financial performance and are
made pursuant to the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995. Such statements involve risks and
uncertainties, which may cause actual results to differ materially from those
set forth in these statements. For example, our forward-looking statements
could be affected by pricing and policy term trends; increased competition;
the impact of acts of terrorism and acts of war; greater frequency or
severity of unpredictable catastrophic events; investigations of market
practices and related settlement terms; negative rating agency actions; the
adequacy of our loss reserves; the company or its subsidiaries becoming
subject to significant income taxes in the United States or elsewhere;
changes in regulations or tax laws; changes in the availability, cost or
quality of reinsurance or retrocessional coverage; adverse general economic
conditions; and judicial, legislative, political and other governmental
developments, as well as management's response to these factors, and other
factors identified in our filings with the U.S. Securities and Exchange
Commission. You are cautioned not to place undue reliance on these
forward-looking statements, which speak only as of the date on which they are
made. We are under no obligation (and expressly disclaim any such obligation)
to update or revise any forward-looking statement that may be made from time
to time, whether as a result of new information, future developments or
otherwise.

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