Berkshire Hathaway Inc. (Berkshire) is a holding company owning subsidiaries engaged in a number of diverse business activities. The Company is engaged in the insurance businesses conducted on both a primary basis and a reinsurance basis, a freight rail transportation business and a group of utility, and energy generation and distribution businesses. Berkshire also owns and operates a number of other businesses engaged in a variety of activities. In October 2012, HomeServices acquired a 66.7% interest in the residential real estate brokerage franchise network in the United States. The Company's insurance underwriting operations are consisted of the sub-groups, including GEICO and its subsidiaries, General Re and its subsidiaries, Berkshire Hathaway Reinsurance Group and Berkshire Hathaway Primary Group. In May 2013, Berkshire acquired the remaining 20% stake in IMC International Metalworking Companies BV.