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Nubank is a Brazilian financial technology firm that offers digital banking services in Brazil, Mexico, and Colombia. Founded in 2013, it is best known for its credit cards and online savings accounts. However, Nubank has expanded its offerings to cover consumer loans, insurance, investments, and cryptocurrency through its mobile app. Thanks to its success in disrupting Brazil's concentrated and fee-heavy banking sector, the company now serves over 100 million customers across its three core markets. Brazil provides more than 90% of its revenue.

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.