10. Ingvar Kamprad (net worth: $40.5 billion) Swedish business magnate controls IKEA, the world’s largest furniture retailer.

9. Larry Ellison (net worth: $42.1 billion) the founder and largest shareholder of Oracle, the database company that had revenue of $37 billion in its 2016 fiscal year.

8. Carlos Slim (net worth: $45.7 billion) ranked as the richest person of the world from 2010 to 2013, Slim controls America Movil, the largest mobile-phone operator in the Americas.

7. Mark Zuckerberg (net worth: $50.3 billion) the youngest billionaire on the list is the co-founder and chief executive officer of Facebook.

6. David Koch (net worth: $50.7 billion) is the executive vice president of Koch Industries, the second-largest closely held company in the U.S.

5. Charles Koch (net worth: $50.7 billion) An elder brother of David Koch, Charles Koch is the chairman and chief executive officer of Koch Industries. Just like his brother, he also owns 42 percent of the company.

4. Jeff Bezos (net worth: $62.9 billion) early investor in Google, Airbnb, and Business Insider, Jeff Bezos is the chairman and largest shareholder of Amazon, the world’s biggest online retailer.

3. Amancio Ortega (net worth: $70 billion).The richest person of Europe, Amancio Ortega is a Spanish businessman who owns 59 percent of Inditex, the world’s largest clothing retailer and parent of the Zara chain.

2. Warren Buffett (net worth: $71 billion) Warren Buffett is the chairman and largest shareholder of Berkshire Hathaway, an Omaha, Nebraska-based investment company. Its assets include Geico, Clayton Homes, and MidAmerican Energy, as well as stakes in Coca-Cola, American Express, and Wells Fargo.

1. Bill Gates (net worth: $86.9 billion) the world’s richest person from 1995 to 2007, again in 2009, and again since 2014, Bill Gates co-founded Microsoft, the world’s biggest software maker, and owns a 2.5 percent stake in the Redmond, Washington-based company.