Zuckerberg's fortune fell by $423 million on Thursday to $10.2 billion. That puts him $400 million behind James Goodnight, the co-founder of SAS Institute, the new number 10 on the The Facebook founder's worth hit $21 billion when the company went public in May. Zuckerberg owns 503.6 million shares of his company including 60 million options with an exercise price of $.06 a share. He also has $150
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