Betting on bandwidth, Global Crossing Chairman Gary Winnick amassed a $4.7 billion fortune at the speed of light. His fiberoptic stake has shrunk almost as fast. His remaining 9% piece of the company he heads is scarcely worth $58 million. But Winnick, 54, is not as poor as this meager figure suggests. He and his family pocketed more than $600 million by cashing in stock over the past two years, even as Global Crossing struggled with a lethal debt load, falling prices and an industry in turmoil. He also arranged to sell, for example, 10 million shares in May, at $12.
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