Fortune 500 rank: 12 (Previous rank: 13)
2006 Revenues (millions): $98,539
Headquarters: Omaha, NE
Get quote: BRKA
Warren Buffett is searching for a successor. In his annual letter to shareholders, he announced his intention to find a new chief investment officer to eventually replace him as the proprietor of Berkshire's $50 billion portfolio. Revenues are up 20% and profits jumped 29%.
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