Berkshire Hathaway Inc. (Berkshire) is a holding company owning subsidiaries engaged in a number of business activities. The most important of these are insurance businesses conducted on both a primary basis and a reinsurance basis. Berkshire also owns and operates a number of other businesses engaged in a variety of activities. Berkshire’s insurance and reinsurance business activities are conducted through over 60 domestic and foreign-based insurance entities. In March 2008, it acquired 60% of Marmon Holdings, Inc. (Marmon). In November 2008, White Mountains Insurance Group, Ltd. (White Mountains) completed its exchange with Berkshire of runoff businesses. Berkshire exchanged about 95% of its interest in White Mountains for 100% of a White Mountains subsidiary, whose holdings consist of Commercial Casualty Insurance Co. and International American Group Inc.