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The Hanover Insurance Group Inc is a holding company whose primary business is offering property and casualty insurance products and services. The company markets itself through independent agents and brokers in the United States while conducting business through Hanover Insurance, Citizens and other THG subsidiaries. The company conducts business operations through four operating segments: Core Commercial, Specialty, Personal Lines, and Other. The company operates an investment portfolio that is exposed to fixed-income securities.

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.