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Donegal Group Inc is an insurance holding company whose insurance subsidiaries and affiliates offer property and casualty insurance in 21 Mid-Atlantic, Midwestern, Southern, and Southwestern states. It includes three segments: Investments Function, Commercial Lines of Insurance, and Personal Lines of Insurance. The majority of revenue is from the commercial Lines segment. The commercial Lines segment consists mainly of commercial automobile, commercial multi-peril, and workers' compensation policies.

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.