Arch Capital Group Ltd. has entered into an agreement to purchase Barbican Group Holdings Limited (“Barbican”) from funds managed by Carlson Capital, a U.S.-based alternative asset management firm, subject to regulatory approval. The acquisition includes Barbican Managing Agency Limited, Lloyd’s Syndicate 1955, Lloyd’s Syndicate 1856 (“Arcus”), Lloyd’s Special Purpose Arrangement (“SPA”) 6132, Castel Underwriting Agencies Limited (“Castel”) and other associated …