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Citigroup is a global financial powerhouse that orchestrates the movement of over $6 trillion in daily transaction volume, serving as the essential connective tissue for the world's most complex multinational corporations. The firm services 90% of the Fortune 500 through a proprietary network that includes direct membership to over 270 cash-clearing centers and a footprint that spans 94 countries. After a checkered history operating as an overly complex, disjointed firm, it has taken steps to streamline operations, resulting in organization across five segments: services, markets, banking, wealth, and US personal banking.

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.