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Slight error: Berkshire Hathaway is currently 4th at $206B.

Berkshire is 5th with $194B (the A shares that is) http://finance.yahoo.com/q?s=brka&d=t

However, the market cap is the A shares plus the B shares.

Ah that's the issue. Yahoo gives only class A (and doesn't show class B); Google just merges them.