Berkshire Hathaway is a holding company with a wide array of subsidiaries engaged in diverse activities. The firm's core business segment is insurance, run primarily through Geico, General Re, Berkshire Hathaway Reinsurance Group, and Berkshire Hathaway Primary Group. The company's second- largest segment includes Burlington Northern Santa Fe (railroad) and Berkshire Hathaway Energy (utilities and energy distributors). The rest of Berkshire's operations consist of finance, manufacturing, service, and retailing firms.
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