OneBeacon Insurance Group, Ltd. (OneBeacon) is a property and casualty insurance writer that provides a range of specialty insurance products, as well as a variety of segmented commercial and personal insurance products. Its reportable segments are: primary insurance operations, affiliate quota shares and other operations. The Company manages primary insurance operations through three major underwriting units: specialty lines, commercial lines and personal lines. Its Affiliate Quota Shares segment reflects the results of two quota share reinsurance agreements it entered into with subsidiaries of White Mountains. In June 2009, the Company announced the formation of specialty business OneBeacon Energy Group.