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Unum Group is a provider of group and individual income protection insurance products in the United States, the United Kingdom, Poland, and other countries. It is the domestic disability insurer, with the majority of premiums generated from employer plans. The company also offers a complementary portfolio of other insurance products, including long-term care insurance, life insurance, and employer- and employee-paid group benefits. It has the following operating business segments: Unum USA, Unum International, Closed Block, Colonial Life, and Corporate. The Unum USA segment generates the majority of revenue. The firm markets its products through brokers.

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.