James River Group Holdings Ltd. engages in the ownership and operation of a group of specialty insurance and reinsurance companies. It operates through the following segments: Excess and Surplus Lines, Specialty Admitted Insurance, Casualty Reinsurance, and Corporate and Other. The Excess and Surplus Lines segment offers E&S commercial lines liability and property insurance products. The Specialty Admitted Insurance segment focuses on s workers' compensation insurance coverage as well as specialty admitted fronting and program business. The Casualty Reinsurance segment deals with commercial liability and non-catastrophe property reinsurance to U.S. insurance companies and to the Company's U.S.-based insurance subsidiaries. The Corporate and Other segment comprises of management and treasury activities of James River Group, James River UK, and JRG Holdings as well as interest expense associated with senior debt and Junior Subordinated Debt, and investment income from investments classified as other invested assets. The company was founded on May 30, 2007 and is headquartered in Hamilton, Bermuda.