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Five Star Bancorp is a bank holding company that operates in California through its subsidiary, a state-chartered non-member bank. The company provides a broad range of banking products and services to small and medium-sized businesses, professionals, and individuals. It offers loan products like commercial real estate loans, commercial loans, commercial land and construction loans, and farmland loans, and offers deposit products like checking accounts, savings accounts, money market accounts, and term certificate accounts. The group has one reportable operating segment: Banking.

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.