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Hamilton Insurance Group Ltd is a specialty insurance and reinsurance company. It operates globally, with underwriting operations in London, Dublin, Bermuda, and the United States. It operates three principal underwriting platforms (Hamilton Global Specialty, Hamilton Select, and Hamilton Re) that are categorized into two reporting business segments: International and Bermuda.

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.