1. Gates, William H. III, United States, 46, $52.8, Microsoft

2. Buffett, Warren E., United States, 71, $35.0, Berkshire Hathaway

3. Albrecht, Karl and Theo, Germany, $26.8, retail

4. Allen, Paul G., United States, 49, $25.2, Microsoft

5. Ellison, Lawrence J., United States, 57, $23.5, Oracle

6. Walton, Jim C., United States, 54, $20.8, Wal-Mart

7. Walton, John T., United States, 56, $20.7, Wal-Mart

8. Walton, Alice L., United States, 53, $20.5, Wal-Mart

8. Walton, S. Robson, United States, 58, $20.5, Wal-Mart

10. Walton, Helen R., United States, 82, $20.4, Wal-Mart

11. Alsaud, Prince Alwaleed Bin Talal, Saudi Arabia, 45, $20.0, investments

12. Quandt, Johanna and family, Germany, 74, $18.4, BMW

13. Bettencourt, Liliane, France, 79, $14.9, L'Oreal

13. Thomson, Kenneth and family, Canada, 78, $14.9, publishing

15. Ballmer, Steven A., United States, 45, $14.8, Microsoft

16. Kamprad, Ingvar, Sweden, 75, $13.4, Ikea

17. Slim Helu, Carlos, Mexico, 62, $11.5, telecom

18. Dell, Michael S., United States, 37, $11.1, Dell

19. Rausing, Kirsten and family, Sweden, 49, $10.7, packaging

20. Kluge, John W., United States, 87, $10.5, media