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PennyMac Financial Services Inc is a specialty financial services firm with a comprehensive mortgage platform mainly focused on the production and servicing of U.S. residential mortgage loans. The firm is also engaged in managing investments related to the U.S. mortgage market and provides products and services that leverage technologies to support customers. The company operates through two reportable operating segments: production and servicing. The production segment performs loan origination, acquisition, and sale activities, while the servicing segment performs servicing and subservicing of loans, early buyout transactions, and servicing of loans sourced and managed for PMT. The majority of revenue comes from the production segment.

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.