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Hannover Re, known formally as Hannover Rück SE, is a global reinsurance company headquartered in Hannover, Germany. Founded in 1966, the company operates in the insurance sector, providing reinsurance products and services across both life/health and property/casualty lines. Hannover Re ranks as the third-largest reinsurance group in the world and is listed on the Frankfurt Stock Exchange under the ticker symbol HNR1.

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.