Who are the 10 richest people in the world? Glad you asked.

Some of the names on the list may surprise you. The sources of their wealth are varied, from a business sector standpoint. Furthermore, the United States has four on the top 10 list -- the most of any nation.

9. Mukesh Ambani, 27 billion, Indian business magnate
9. Mukesh Ambani, $27 billion, Indian business magnate. REUTERS
Mubadala Development Company is buying a 2 billion stake in Eike Batistas Brazilian business empire
Brazilian mogul Eike Batista on Tuesday announced the sale a 5.63 percent equity stake in his ESX Group to Abu Dhabi's sovereign-wealth fund for $2 billion. REUTERS
7. Amancio Ortega, 31 billion, Spanish fashion entrepreneur.
7. Amancio Ortega, $31 billion, Spanish fashion entrepreneur. REUTERS
6. Lakshmi Mittal, 31.1 billion, Indian steel magnate
6. Lakshmi Mittal, $31.1 billion, Indian steel magnate. REUTERS
CEO of Oracle Corporation Larry Ellison has also hit the list with his net worth estimated at 33 billion.
Larry Ellison's Oracle missed profit expectations and saw its shares plummet on Wednesday. REUTERS
4. Bernard Arnault, 41.0 billion, French businessman
4. Bernard Arnault, $41.0 billion, French businessman. REUTERS
10. Christy Walton, 26.5 billion, U.S. philanthropist, daughter-in-law of Sam Walton
10. Christy Walton, $26.5 billion, U.S. philanthropist, daughter-in-law of Sam Walton, founder of Wal-Mart (WMT). [Note: No photo available of Christy Walton.] REUTERS
Warren buffett Bill Gates United States Warren buffett