Arch Insurance Group Names Brian Hughes Senior Vice President and Chief Actuary

NEW YORK--(BUSINESS WIRE)--June 15, 2006--Arch Insurance Group, a subsidiary of Arch Capital Group Ltd., announced that Brian Hughes has been promoted to the position of Senior Vice President and Chief Actuary. In his new role, Mr. Hughes will assume responsibility for all of Arch Insurance Group's actuarial functions.

"Our ability to promote from within the company is an indication of the strength of our management team. Brian has done an excellent job for Arch during his two years as our Chief Pricing Actuary and this promotion reinforces his value to our company," said Ralph Jones, Chairman and CEO, Arch Insurance Group.

“Our ability to promote from within the company is an indication of the strength of our management team. Brian has done an excellent job for Arch during his two years as our Chief Pricing Actuary and this promotion reinforces his value to our company”

Mr. Hughes joined Arch Insurance Group in October 2004 as Chief Pricing Actuary. He has over 25 years of experience in the insurance and reinsurance business and has held a variety of pricing and reserving roles for all major lines of business during that time. Prior to joining Arch, he served as Senior Vice President and Pricing Actuary for Converium. Mr. Hughes is a Fellow of the Casualty Actuarial Society and a member of the American Academy of Actuaries. He holds a B.A. degree in Mathematics from Queens College, City University of New York.

Arch Insurance Group Inc. is a division of Arch Capital Group Ltd., a Bermuda-based company that provides insurance and reinsurance on a worldwide basis through its wholly owned subsidiaries. Arch Insurance Group's principal insurance subsidiaries - Arch Insurance Company, Arch Specialty Insurance Company and Arch Excess & Surplus Insurance Company - are rated "A-" (Excellent) by A.M. Best and "A-" (Strong) from Standard and Poor's. For more information, visit www.archinsurance.com.

Cautionary Note Regarding Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 provides a "safe harbor" for forward-looking statements. This release or any other written or oral statements made by or on behalf of Arch Capital Group Ltd. and its subsidiaries (collectively, the "Company") may include forward-looking statements which reflect the Company's current views with respect to future events and financial performance. Forward-looking statements involve the Company's current assessment of risks and uncertainties, which may cause actual events and results and prospects to differ materially from those expressed or implied in these statements. Certain information regarding such risks and uncertainties is set forth in the Company's filings with the Securities and Exchange Commission. The Company undertakes no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise.