15. George Soros

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Chairman of Soros Fund Management, LLC and Founder of The Open Society Institute; Net Worth: $13 Billion (AP Photo/Koji Sasahara)

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15. George Soros Chairman of Soros Fund Management, LLC and Founder of The Open Society Institute; Net Worth: $13 Billion (AP Photo/Koji Sasahara)
14. Steven Ballm... CEO of Microsoft Corp.; Net Worth: $13.3 Billion (AP Photo/Gary Malerba)
13. Michael Dell Founder, Chairman and CEO of Dell Corp.; Net Worth: $14.5 Billion (AP Photo/Paul Sakuma)
11. (tie) Sergey... Co-Founders of Google Inc.; Net Worth: $15.3 Billion (AP Photo/Gautam Singh)
9. (tie) David K... Co-Founders of Koch Industries Inc.; Net Worth: $16 Billion (AP Photo/Larry W. Smith)
8. Michael Bloom... Mayor of New York City and Founder of Bloomberg, L.P.; Net Worth: $17.5 Billion (AP Photo/Vincent Thian)
7. S. Robson Wal... Chairman of Wal-Mart Stores Inc.; Net Worth: $19 Billion (AP Photo/Neemah Aaron)
6. Alice Walton Wal-Mart Stores Inc. Heiress; Net Worth: 19.3 Billion (AP Photo/April L. Brown)
5. Jim Walton Wal-Mart Stores Inc. Inheritor (right); Net Worth: $19.6 Billion
4. Christy Walto... The wealthiest of the Wal-Mart Stores Inc. hiers, due in part to Christy's late husband John's (pictured above, second to left) investing calls; Net Worth: $21.5 Billion
3. Larry Ellison Founder of Oracle Corp.; Net Worth: $27 Billion (AP Photo/Paul Sakuma)
2. Warren Buffet... CEO of Berkshire Hathaway Inc.; Net Worth: $40 Billion (AP Photo/Nati Harnik)
1. Bill Gates Co-founder and Chairman of Microsoft Corp.; Net Worth: $50 Billion (AP Photo/Matt Rourke)