White Mountains Insurance is a property, casualty insurance and reinsurance company based in Bermuda.

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Originally dealing in savings and loans, American Financial Group later branched out into property and casualty insurance and annuities with the acquisition of Great American Insurance Company in 1973.

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Company profit margins for all kinds of property and casualty insurance from 2003-2010 match historic averages, according to the Insurance Service Office, which compiles data.

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Cincinnati Financial, headquartered in Fairfield, OH, is one of the top 25 property and casualty insurers in the U.S. The company operates through the Cincinnati Insurance Company, which itself has four insurance subsidiaries, and through two financial services subsidiaries.

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It recently acquired a 20 percent interest in Dazhong Insurance, a property and casualty insurer backed by the city of Shanghai, where Starr began his company in 1919.

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