1. Bill Gates Net Worth: $81B Source of wealth: Microsoft 2. Jeff Bezos Net Worth: $67B Source of wealth: Amazon.com 3. Warren Buffett Net Worth: $65.5B Source of wealth: Berkshire Hathaway 4. Mark Zuckerberg Net Worth: $55.5B Source of wealth: Facebook 5. Larry Ellison Net Worth: $49.3B Source of wealth: Oracle 6. Michael Bloomberg Net Worth: $45B Source of wealth: Bloomberg LP 7. Charles Koch Net Worth: $42B Source of wealth: diversified 7. David Koch Net Worth: $42B Source of wealth: diversified 9. Larry Page Net Worth: $38.5B Source of wealth: Google 10. Sergey Brin Net Worth: $37.5B Source of wealth: Google 11. Jim Walton Net Worth: $35.6B Source of wealth: Wal-Mart 12. S. Robson Walton Net Worth: $35.5B Source of wealth: Wal-Mart 13. Alice Walton Net Worth: $35.4B Source of wealth: Wal-Mart 14. Sheldon Adelson Net Worth: $31.8B Source of wealth: casinos 15. Steve Ballmer Net Worth: $27.5B Source of wealth: Microsoft 16. Jacqueline Mars Net Worth: $27B Source of wealth: candy Read More: Billionaires’ Secrets to Building Wealth 16. John Mars Net Worth: $27B Source of wealth: candy 18. Phil Knight Net Worth: $25.5B Source of wealth: Nike 19. George Soros Net Worth: $24.9B Source of wealth: hedge funds 20. Michael Dell Net Worth: $20B Source of wealth: Dell computers 21. Paul Allen Net Worth: $18.9B Source of wealth: Microsoft, investments 22. Len Blavatnik Net Worth: $18.2B Source of wealth: diversified 23. Laurene Powell Jobs Net Worth: $17.7B Source of wealth: Apple, Disney 24. James Simons Net Worth: $16.5B Source of wealth: hedge funds 25. Ray Dalio Net Worth: $15.9B Source of wealth: hedge funds 26. Carl Icahn Net Worth: $15.7B Source of wealth: investments 27. Donald Bren Net Worth: $15.2B Source of wealth: real estate 28. Charles Ergen Net Worth: $14.7B Source of wealth: satellite TV 29. Abigail Johnson Net Worth: $13.2B Source of wealth: money management 30. Harold Hamm Net Worth: $13.1B Source of wealth: oil & gas 31. Steve Cohen Net Worth: $13B Source of wealth: hedge funds 32. Thomas Peterffy Net Worth: $12.6B Source of wealth: discount brokerage 33. Ronald Perelman Net Worth: $12.2B Source of wealth: leveraged buyouts 34. Elon Musk Net Worth: $11.6B Source of wealth: Tesla Motors 35. David Tepper Net Worth: $11.4B Source of wealth: hedge funds 36. Eric Schmidt Net Worth: $11.3B Source of wealth: Google 37. Lukas Walton Net Worth: $11.2B Source of wealth: Wal-Mart 38. Rupert Murdoch Net Worth: $11.1B Source of wealth: newspapers, TV network 39. Philip Anschutz Net Worth: $10.8B Source of wealth: investments 39. Jim Kennedy Net Worth: $10.8B Source of wealth: media 39. Blair Parry-Okeden Net Worth: $10.8B Source of wealth: media 42. Donald Newhouse Net Worth: $10.5B Source of wealth: media 42. Samuel Newhouse Net Worth: $10.5B Source of wealth: media 44. Dustin Moskovitz Net Worth: $10.4B Source of wealth: Facebook 45. Stephen Schwarzman Net Worth: $10.3B Source of wealth: investments 46. John Menard Net Worth: $9.4B Source of wealth: home improvement stores 47. Patrick Soon-Shiong Net Worth: $9.2B Source of wealth: pharmaceuticals 48. Leonard Lauder Net Worth: $9B Source of wealth: Estee Lauder 49. Andrew Beal Net Worth: $8.9B Source of wealth: banks, real estate 50. Jan Koum Net Worth: $8.8B Source of wealth: WhatsApp 51. James Goodnight Net Worth: $8.7B Source of wealth: software 52. Herbert Kohler Net Worth: $8.6B Source of wealth: plumbing fixtures 52. John Paulson Net Worth: $8.6B Source of wealth: hedge funds 54. Pierre Omidyar Net Worth: $8.1B Source of wealth: eBay 55. Thomas Frist Net Worth: $7.9B Source of wealth: health care 56. Gordon Moore Net Worth: $7.6B Source of wealth: Intel 57. Ken Griffin Net Worth: $7.5B Source of wealth: hedge funds 58. Eli Broad Net Worth: $7.4B Source of wealth: investments 58. Stanley Kroenke Net Worth: $7.4B Source of wealth: sports, real estate 58. Stephen Ross Net Worth: $7.4B Source of wealth: real estate 61. Micky Arison Net Worth: $7.2B Source of wealth: Carnival Cruises 61. James Chambers Net Worth: $7.2B Source of wealth: media 61. Carl Cook Net Worth: $7.2B Source of wealth: medical devices 61. George Kaiser Net Worth: $7.2B Source of wealth: oil & gas, banking 61. John Malone Net Worth: $7.2B Source of wealth: cable television 61. Katharine Rayner Net Worth: $7.2B Source of wealth: media 61. Margaretta Taylor Net Worth: $7.2B Source of wealth: media 68. Edward Johnson Net Worth: $7.1B Source of wealth: money management 69. Richard Kinder Net Worth: $7B Source of wealth: pipelines 70. Shahid Khan Net Worth: $6.9B Source of wealth: auto parts 70. Hank & Doug Meijer Net Worth: $6.9B Source of wealth: supermarkets 70. Les Wexner Net Worth: $6.9B Source of wealth: retail 73. David Duffield Net Worth: $6.7B Source of wealth: business software 73. David Geffen Net Worth: $6.7B Source of wealth: movies, record labels 73. Richard LeFrak Net Worth: $6.7B Source of wealth: real estate 76. Charles Schwab Net Worth: $6.6B Source of wealth: discount brokerage 77. Pauline MacMillan Keinath Net Worth: $6.4B Source of wealth: Cargill 78. Bruce Halle Net Worth: $6.3B Source of wealth: tires 78. Travis Kalanick Net Worth: $6.3B Source of wealth: Uber Technologies 80. Ann Walton Kroenke Net Worth: $6.2B Source of wealth: Wal-Mart 81. David Green Net Worth: $6.1B Source of wealth: retail 82. Robert Rowling Net Worth: $6B Source of wealth: investments 83. Ralph Lauren Net Worth: $5.9B Source of wealth: Ralph Lauren 83. John A. Sobrato Net Worth: $5.9B Source of wealth: real estate 83. Dennis Washington Net Worth: $5.9B Source of wealth: construction, mining 86. Michael & Marian Ilitch Net Worth: $5.8B Source of wealth: pizza 87. Christy Walton Net Worth: $5.6B Source of wealth: Wal-Mart 88. Brian Acton Net Worth: $5.4B Source of wealth: WhatsApp 88. Richard DeVos Net Worth: $5.4B Source of wealth: Amway 90. Bruce Kovner Net Worth: $5.3B Source of wealth: hedge funds 90. Ted Lerner Net Worth: $5.3B Source of wealth: real estate 90. David Sun Net Worth: $5.3B Source of wealth: computer hardware 90. John Tu Net Worth: $5.3B Source of wealth: computer hardware 94. Dannine Avara Net Worth: $5.2B Source of wealth: pipelines 94. Jim Davis Net Worth: $5.2B Source of wealth: New Balance 94. Scott Duncan Net Worth: $5.2B Source of wealth: pipelines 94. Milane Frantz Net Worth: $5.2B Source of wealth: pipelines 94. Jerry Jones Net Worth: $5.2B Source of wealth: Dallas Cowboys 94. Whitney MacMillan Net Worth: $5.2B Source of wealth: Cargill 94. Trevor Rees-Jones Net Worth: $5.2B Source of wealth: oil & gas 94. Randa Williams Net Worth: $5.2B Source of wealth: pipelines .