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John Marshall Bancorp Inc is a bank holding company. Through its banking subsidiary, it offers banking products and financial services to small to medium-sized businesses, professional corporations, non-profits, and individuals. The products and services offered by the company include commercial checking, savings, and money market accounts, certificates of deposit, treasury and cash management services, commercial and industrial loans, commercial real estate loans, residential and commercial construction and development loans, online banking, and mobile banking. The firm serves local businesses, professionals, individuals, and families throughout the Washington, D.C. metropolitan area.

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.