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MGIC Investment Corp provides private mortgage insurance, other mortgage credit risk management solutions, and ancillary services. The insurance premiums that these customers pay for the protection account for close to the majority of the company's total revenue. Investment income accounts for the remaining revenue. The company sells its insurance products in all states of the United States and in Puerto Rico. Its greatest exposure is in California, Florida, Texas, Pennsylvania, Ohio, Illinois, Virginia, North Carolina, Georgia, and New York.

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.