White Mountains Insurance Group, Ltd. conducts its businesses through its property and casualty insurance and reinsurance subsidiaries and affiliates. It operates in OneBeacon, Sirius Group, HG Global/BAM and Other Operations. The OneBeacon segment consists of OneBeacon Insurance Group, Ltd., a company that owns a family of the United States-based property and casualty insurance companies. The Sirius Group segment consists of Sirius International Insurance Group, Ltd. and its subsidiaries. The HG Global/BAM segment consists of White Mountains� investment in HG Global Ltd. (HG Global) and the results of Build America Mutual Assurance Company (BAM). The Company�s Other Operations segment consists of the Company and its holding companies. In February 2014, White Mountains Insurance Group Ltd acquired certain assets and liabilities of Star & Shield Holdings LLC, including Star & Shield Risk Management LLC, by a wholly-owned subsidiary of the Company.