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Trustmark Corp is a bank holding company. Through its subsidiaries, the company operates as a financial services organization providing banking and other financial solutions in Alabama, Florida, Mississippi, Tennessee, and Texas. Its principal products and services include Commercial Banking, Consumer Banking, Mortgage Banking, Insurance, Wealth Management and Trust Services, and others. The company is managed along two operating segments: General Banking and Wealth Management. The General Banking segment, which generates the majority of the revenue, provides all traditional banking products and services, including loan deposits, and also consists of internal operations.

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.