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mBank S.A. is a Polish banking institution headquartered in Warsaw, Poland. It operates in the financial services industry, offering a range of products including retail banking, corporate banking, and investment services. Originally established in 1986 under the name BRE Bank, it rebranded to mBank in 2013 to unify its online and traditional banking offerings under one brand. The company has a significant presence in both the Polish and European markets, with operations extending to the Czech Republic and Slovakia. mBank is known for its strong online banking platform and digital innovation, catering to both individual and business clients.

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.