Arch Capital Group Ltd. Announces Additional $1 Billion Share Repurchase Authorization

Arch Capital Group Ltd. ACGL today announced that its Board of Directors authorized the Company to invest up to an additional $1 billion in the Company's common shares. This authorization is in addition to the $84.4 million available at February 24, 2011 under the Board's previous share repurchase authorization. Repurchases under the new authorization may be effected from time to time in open market or privately negotiated transactions through December 31, 2012. The timing and amount of the repurchase transactions under this authorization will depend on a variety of factors, including market conditions and corporate and regulatory considerations.