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Enact Holdings Inc is a private mortgage insurance company serving the United States housing finance market. The company operates in a single reportable segment namely Mortgage Insurance The principal mortgage insurance customers are originators of residential mortgage loans that determines the mortgage insurer or insurers to be used for the placement of mortgage insurance written on loans originated. The company is engaged in writing and assuming residential mortgage guaranty insurance.

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.