Buffett not only is big on investing in insurance stocks, but he wholly owned some of the best insurance firms for decades via GEICO. If Buffett has a question about the insurance industry, he has his own savvy GEICO execs on "speed dial." Especially Ajit Jain who was once seen as heir apparent to Buffett at BRK.
Until their recent move into energy, Insurance was usually considered BRK's core activity.
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