Allied World Announces Branch Office in Singapore

PEMBROKE, Bermuda, November 12 - Allied World Assurance Company Holdings, Ltd (NYSE: AWH) today announced
the opening of a branch office in Singapore in order to further expand its
operations in Asia, and has appointed Bruce Ford as its Principal Officer and
Head of Treaty Asia Pacific, Middle East and Africa. Allied World's
operations have received authorization from the Monetary Authority of
Singapore to conduct general insurance business operations. The office will
be the Allied World hub for all classes of treaty business for the region, as
well as offering direct insurance products for South Asia with an initial
focus on professional lines and casualty classes.

Scott Carmilani, Allied World's President and Chief Executive Officer,
commented, "Allied World sees great potential in Asia and in our ability to
address growing risks for clients. Our new Singapore office will complement
and expand on the services and expertise we already bring to the region.
Together with our Hong Kong branch office, which we opened in March 2009, we
will be able to further respond to the needs of this market."

For more information on Allied World's regional office in Singapore,
please contact Bruce Ford, Vice President, Head of Treaty Asia Pacific:
bruce.ford@awac.com, +65-90616925 or +65-68325080. The office will be located
at #02-103 One Fullerton, 1 Fullerton Road, Singapore 049213.

About Allied World Assurance Company

Allied World's office in Singapore is a branch office of Allied World
Assurance Company, Ltd, our Bermuda insurance and reinsurance 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, Hong Kong and Singapore. 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 the ability to recognize the benefits of the Darwin
Professional Underwriters, Inc. acquisition; 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.

Media, 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, both of Allied World Assurance Company Holdings, Ltd