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Kingstone Companies Inc offers property and casualty insurance products through its subsidiary engaged in writing business through retail and wholesale agents and brokers. Its products include Personal lines, Livery physical damage, and Others. It operates in single segment, property and casualty insurance. It derives substantially all of its revenue from KICO, including revenues from earned premiums, ceding commissions from quota share reinsurance, net investment income generated from its investment portfolio, and net realized gains and losses on investment securities.

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, Berkshire Hathaway Reinsurance Group, and Berkshire Hathaway Primary Group. Berkshire has used the excess cash thrown off from its operations to acquire Burlington Northern Santa Fe (railroad), Berkshire Hathaway Energy (utilities and energy distributors), and the companies that make up its manufacturing, service, and retailing operations (which include Precision Castparts, Lubrizol, Clayton Homes, Marmon, and IMC/ISCAR). The conglomerate is unique in that it is run on a completely decentralized basis.