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RLI Corp underwrites property and casualty insurance through its subsidiaries. The company offers insurance coverage in the specialty admitted market, where the products are designed for special risks. It also offers products in the excess and surplus markets, which provides an alternative for customers with risks or loss exposures that generally cannot be written in the standard admitted market. RLI distributes property and casualty insurance through its wholly-owned branch offices that market to wholesale and retail producers. The company's insurance operation segments include Casualty, Property, and Surety, and it derives a majority of its revenue from the Casualty segment.

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.