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Bank of Marin Bancorp is a United States-based bank holding company. It conducts business through its wholly-owned subsidiary. The Bank provides a wide range of financial services to customers such as professionals, small and middle-market businesses, and individuals residing in Marin, Sonoma, Napa, San Francisco, Alameda, Contra Costa, San Mateo counties, and others. The majority of its revenue comes from interest income.

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.