Exhibit 99.1
ALLIED WORLD REAFFIRMS POSITION;
STANDS BEHIND TERMS OF TRANSALLIED’S ‘MERGER OF EQUALS’ AGREEMENT
Zug, Switzerland — July 19, 2011 —Allied World Assurance Company Holdings, AG (NYSE: AWH) today
commented on the decision by Transatlantic’s (NYSE: TRH) board to “remain committed to the terms of
the Allied World Merger Agreement.”
Allied World’s Chairman, President and CEO, Scott Carmilani, stated: “We agree with today’s
decision by Transatlantic’s board that the unsolicited proposal set forth by Validus does not
constitute a superior proposal. Allied World remains fully committed to the terms of our merger of
equals agreement, which we believe provides the best long-term value and benefits for all
shareholders. With integration planning underway and having received
Hart-Scott-Rodino clearance,
we look forward to completing our merger of equals as early as possible in the fourth quarter.”
Deutsche Bank Securities Inc. is acting as financial advisor and Willkie Farr & Gallagher LLP and
Baker & McKenzie are acting as U.S. and Swiss legal counsel, respectively, to Allied World.
About Allied World
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 offices and branches. All of Allied World’s rated
insurance and reinsurance subsidiaries are rated A by A.M. Best Company, A by Standard & Poor’s,
and A2 by Moody’s, and our Lloyd’s Syndicate 2232 is rated A+ by Standard & Poor’s and Fitch.
Please visit www.awac.com for further information on Allied World.
Additional Information About the Proposed Merger and Where to Find It
This communication relates to a proposed merger between Allied World and Transatlantic. In
connection with the proposed merger, Allied World has filed with the U.S. Securities and Exchange
Commission (the “SEC”) a registration statement on Form S-4 that includes a preliminary joint proxy
statement/prospectus that provides details of the proposed merger and the attendant benefits and
risks. This communication is not a substitute for the joint proxy statement/prospectus or any
other document that Allied World or Transatlantic may file with the SEC or send to their
shareholders in connection with the proposed merger. Investors and security holders are urged to
read the registration statement on Form S-4, including the preliminary joint proxy
statement/prospectus, and all other relevant documents filed with the SEC (including the definitive
joint proxy statement/prospectus) or sent to shareholders as they become available because they
will contain important information about the proposed merger. All documents, when filed, will be
available free of charge at the SEC’s website (www.sec.gov). You may also obtain these documents by
contacting Allied World’s Corporate Secretary, attn.: Wesley D. Dupont, at Allied World Assurance
Company Holdings, AG, Lindenstrasse 8, 6340 Baar, Zug, Switzerland, or via e-mail at
secretary@awac.com; or by contacting Transatlantic’s Investor
Relations department at Transatlantic Holdings, Inc., 80 Pine Street, New York, New York 10005, or
via e-mail at investor_relations@transre.com. This communication does not constitute an offer to
sell or the solicitation of an offer to buy any securities or a solicitation of any vote or
approval.
Participants in the Solicitation
Allied World, Transatlantic and their respective directors and executive officers may be deemed to
be participants in any solicitation of proxies in connection with the proposed merger. Information
about Allied World’s directors and executive officers is available in Allied World’s proxy
statement dated March 17, 2011 for its 2011 Annual Meeting of Shareholders. Information about
Transatlantic’s directors and executive officers is available in Transatlantic’s proxy statement
dated April 8, 2011 for its 2011 Annual Meeting of Shareholders. Other information regarding the
participants in the proxy solicitation and a description of their direct and indirect interests, by
security holdings or otherwise, may be contained in the definitive joint proxy statement/prospectus
and other relevant materials to be filed with the SEC regarding the merger when they become
available. Investors should read the definitive joint proxy statement/prospectus carefully when it
becomes available before making any voting or investment decisions.
Cautionary Statement Regarding Forward-Looking Statements
Any forward-looking statements made in this communication reflect Allied World’s 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, these forward-looking statements could be affected by the occurrence
of any event, change or other circumstances that could give rise to the termination of the merger
agreement; the inability to obtain Allied World’s or Transatlantic’s shareholder approval or the
failure to satisfy other conditions to completion of the merger, including receipt of regulatory
approvals; risks that the proposed transaction disrupts each company’s current plans and
operations; the ability to retain key personnel; the ability to recognize the benefits of the
merger; the amount of the costs, fees, expenses and charges related to the merger; 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; negative rating agency actions; the
adequacy of Allied World’s loss reserves; Allied World or its non-U.S. 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
Allied World’s filings with the SEC. 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. Allied World is
under no obligation (and expressly disclaims 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.
Contacts
Media:
Faye Cook
VP, Marketing & Communications
1-441-278-5406
faye.cook@awac.com
Mike Pascale/Allyson Morris
The Abernathy MacGregor Group
1-212-371-5999
mmp@abmac.com/afm@abmac.com
Investors:
Keith J. Lennox
Investor Relations Officer
1-646-794-0750
keith.lennox@awac.com