Arch Capital Group Ltd. provides property and casualty insurance and reinsurance lines. It operates through the following segments: Insurance, Reinsurance, Mortgage, Corporate (Non-Underwriting), and Other. The Insurance segment consists insurance underwriting units which offer specialty product lines like construction and national accounts, excess and surplus casualty, lenders products, professional lines, and programs. The Reinsurance segment comprises reinsurance underwriting which offer specialty product lines such as casualty, marine and aviation, other specialty, property catastrophe, property excluding property catastrophe, and other. The Mortgage segment includes U.S. and international mortgage insurance and reinsurance operations as well as GSE credit risk sharing transactions. The Corporate (Non-Underwriting) segment involves in net investment income, other income, corporate expense, interest expense, net realized gains and losses, and net impairment losses. The Other segment refers to Watford Re. which is a variable interest entity. The company was founded by Clements Robert in September 2000 and is headquartered in Hamilton, Bermuda.