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Joseph Lewis
Joseph Lewis
Tavistock Group founder

Estimated losses: $904.5 million*

The British-born currency trader and multi-billionaire bet six months ago that Bear Stearns, which had already shed about 30% of its value, was a bargain. He scooped up enough stock to become the firm's largest shareholder, with a 9% stake by year-end.

*Estimates based on Lewis' holdings at the beginning of 2008, when the stock was trading at $88.35.

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Last updated April 03 2008: 8:08 AM ET
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* : Time reflects local markets trading time.† - Intraday data delayed 15 minutes for Nasdaq, and 20 minutes for other exchanges.• Disclaimer