James River Group Holdings, Ltd. (JRG Holdings) is an insurance and reinsurance holding company. The Company operates through four segments: Excess and Surplus Lines, Specialty Admitted Insurance, Casualty Reinsurance, and Corporate and Other. The Excess and Surplus Lines segment offers commercial excess and surplus lines liability and excess property insurance products. The Specialty Admitted Insurance segment offers workers' compensation insurance coverage, as well as specialty admitted fronting and program business. The Casualty Reinsurance segment offers commercial liability and non-catastrophe property reinsurance to the United States insurance companies and to its the United States-based insurance subsidiaries. The Corporate and Other segment consists of certain management and treasury activities of James River Group, Inc., James River Group Holdings UK Limited and JRG Holdings. It owns six insurance companies focused on specialty insurance niches and a reinsurance company.