1. Bill Gates
He is a software giant and currently the richest person in the world. He co-founded the largest computer software company in the world, Microsoft.
2. Amancio Ortega
Ortega stepped down as chairman of Inditex, the $15.8 billion (sales) fashion firm, but retains 87% of his fortune from his stake in the publicly traded firm. The company, which operates under several brand names including Zara, Massimo Dutti and Stradivarius, has 5,000 stores in 77 countries.
3. Warren Buffett
He made is fortune by making sound investments. He is the chairman and CEO of Berkshire Hathaway, a multi-billion dollar holdings company.
4. Carlos Slim
He holds massive investments in diverse fields which include finance, retailing, technology, and communications. Currently, he serves as the chief executive officer and chairman of América Móvil and Telmex telecommunications companies.
5. Jeff Bezos
He is the founder, president, CEO, and chairman of Amazon.com.
6. Mark Zuckerberg
He is the co-founder of the popular social networking site Facebook, of which he is chief executive and president. Facebook has over 1.5 billion users worldwide.
7. Larry Ellison
Founder of tech giant Oracle.
8. Michael Bloomberg
Founder and CEO, and owner of Bloomberg L.P. a global financial data and media company, used by investment professional globally.
9. Charles Koch
He is co-owner, chairman of the board and chief executive officer of Koch Industries Inc., the second-largest privately held company by revenue.
9. David Koch
He 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 by revenue.