Microsoft founder Bill Gates takes over Forbes' world's richest list, topping Mexican billionaire Carlos Slim Helu. Find out what other billionaires made this year's list.
8. Sheldon Adelson -- An American casino and hotel magnate, Adelson is chairman and chief executive officer of the Las Vegas Sands Corporation. He is worth an estimated $38 billion.
10. Jim Walton (Right, pictured with brother Rob and sister Alice) -- The youngest son of Walmart founder Sam Walton, Jim Walton is also the chairman and CEO of Arvest Bank. He's worth an estimated $34.7 billion.
13. Michael Bloomberg -- The mayor of New York City is worth an estimated $27 billion.
12. Stefan Persson -- The Sweden native is chairman of the retailer H & M and is worth an estimated $34.4 billion.
9. Christy Walton & Family -- The WalMart heiress is the world's richest woman, worth an estimated $36.7 billion.
15. Bernard Arnault & Family -- The chairman of the French luxury goods group LVMH is worth an estimated $33.5 billion.
11. Liliane Bettencourt & Family -- The French billionaire and L'Oreal heiress is worth an estimated $34.5 billion.
8. Li Ka-shing -- The Hong Kong tycoon is chairman of Hutchison Whampoa & Chueng Kong Holdings. He's worth an estimated $31 billion.
6. Charles Koch (tie) -- Along with brother David, Charles is co-owner and executive vice president of Koch Industries, the second-largest privately held company in the U.S. He's worth an estimated $40 billion.
6. David Koch (tie) -- The billionaire is co-owner (with older brother Charles) and an executive vice president of Koch Industries, a conglomerate that is the second-largest privately held company in the U.S. He's worth an estimated $40 billion.
5. Larry Ellison -- The CEO of Oracle, Ellison's net worth is estimated at $54 billion.
2. Warren Buffett -- The 84-year-old CEO of Berkshire Hathaway is worth an estimated $73 billion.
4. Armancio Ortega -- The Spanish Inditex chairman is worth an estimated $61 billion.
1. Bill Gates -- Gates, co-founder of Microsoft Corp., is also co-chairman of the Bill & Melinda Gates Foundation. His net worth is more than $80.4 billion.
3. Carlos Slim Helu & Family -- The Mexican telecom mogul's net worth fell slightly to $72.9 billion.