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Dave Sokol
Company: NetJets
2009 Revenues: $3.1 billion

The relatively small size of NetJets belies Sokol's influence -- he's chairman of two other Berkshire companies, MidAmerican and Johns Manville. He is mentioned most often as Buffett's successor.

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Last updated August 02 2010: 6:54 AM ET
Note: Figures for insurance companies are underwriting revenues.
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