White Mountains Insurance Group Ltd. is an insurance holding company, which engages in the insurance, financial services, and related sectors. It operates through the following segments: HG Global/BAM, MediaAlpha, NSM, and Other Operations. The HG Global/BAM segment refers to the White Mountains's investment in HG Global Limited, and the consolidated results of Build America Mutual Assurance Company (BAM). The MediaAlpha segment develops transparent platforms for the buying and selling of insurance and other vertical-specific performance media. The NSM segment comprises of full-service managing general underwriting agency and program administrator for specialty property and casualty insurance. The Other Operations segment comprises of the Company, its wholly-owned subsidiary, WM Capital, its wholly-owned investment management subsidiary, WM Advisors, and its other intermediate holding companies, as well as certain consolidated and unconsolidated private capital and other investments. The company was founded in 1980 and is headquartered in Hanover, NH.