Enstar Group Limited is an insurance company that acquires and manages insurance and reinsurance companies in run-off and portfolios of insurance and reinsurance business in run-off. The company operates through three segments: Non-Life Run-Off, Atrium, and StarStone. The Non-Life Run-Off segment engages in the running off property and casualty, and other non-life lines of businesses. The Atrium segment underwrites specialist marine, energy, aerospace, non-marine, and liability classes. The StarStone segment offers a range of property, casualty, and specialty insurance products to large multi-national, small and medium-sized enterprises, and individuals. The company was founded in 2001 and is headquartered in Hamilton, Bermuda.