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Rathbone Brothers is a UK-based wealth management company that provides personalized investment and financial planning services. Its core business involves managing private client investment portfolios, offering services such as investment management, tax planning, and trust services. Headquartered in London, the company has a significant presence across the United Kingdom. Rathbone Brothers traces its origins back to 1742, emphasizing its long-standing history in the financial industry. Its competitive strengths lie in its bespoke service offerings and extensive expertise in managing discretionary portfolios, catering primarily to high-net-worth individuals and families.

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.