1. Elon Musk – $201 billion (as of October 2021) – Source of Wealth: Tesla, SpaceX, and other ventures
Elon Musk is a South African-born American entrepreneur and businessman who is best known as the founder, CEO, and lead designer of SpaceX and Tesla. In addition to these ventures, Musk has also founded companies such as PayPal and Neuralink, which have been instrumental in advancing technology in various fields.

2. Jeff Bezos – $191 billion (as of October 2021) – Source of Wealth: Amazon
Jeff Bezos is an American entrepreneur and businessman who is the founder and CEO of Amazon, the world’s largest online retailer. Bezos has also invested in other ventures, including Blue Origin, a space exploration company.

3. Bernard Arnault – $155 billion (as of October 2021) – Source of Wealth: LVMH
Bernard Arnault is a French businessman and the CEO of LVMH, a multinational luxury goods conglomerate. LVMH owns some of the world’s most iconic fashion brands, including Louis Vuitton, Dior, and Fendi.

4. Bill Gates – $135 billion (as of October 2021) – Source of Wealth: Microsoft
Bill Gates is an American entrepreneur, software developer, and philanthropist who co-founded Microsoft, one of the world’s largest software companies. Gates has also become a prominent philanthropist, donating billions of dollars through the Bill and Melinda Gates Foundation to support education, healthcare, and poverty alleviation.

5. Mark Zuckerberg – $124 billion (as of October 2021) – Source of Wealth: Facebook
Mark Zuckerberg is an American entrepreneur and the co-founder and CEO of Facebook, the world’s largest social media platform. Zuckerberg has also invested in other ventures, including the Chan Zuckerberg Initiative, a philanthropic organization that focuses on education and healthcare.

6. Larry Ellison – $100 billion (as of October 2021) – Source of Wealth: Oracle
Larry Ellison is an American entrepreneur and businessman who co-founded Oracle Corporation, a multinational computer technology corporation that specializes in developing and marketing software and hardware systems.

7. Larry Page – $97 billion (as of October 2021) – Source of Wealth: Google
Larry Page is an American entrepreneur and computer scientist who co-founded Google, the world’s largest search engine. Page has also invested in other ventures, including flying car company Kitty Hawk and autonomous vehicle company Waymo.

8. Sergey Brin – $95 billion (as of October 2021) – Source of Wealth: Google
Sergey Brin is a Russian-American entrepreneur and computer scientist who co-founded Google with Larry Page. In addition to Google, Brin has invested in other ventures, including biotech company 23andMe.

9. Steve Ballmer – $91.5 billion (as of October 2021) – Source of Wealth: Microsoft
Steve Ballmer is an American businessman and the former CEO of Microsoft. Ballmer is also the owner of the Los Angeles Clippers, a professional basketball team in the NBA.

10. Warren Buffett – $90 billion (as of October 2021) – Source of Wealth: Berkshire Hathaway
Warren Buffett is an American investor, business magnate, and philanthropist who is the CEO of Berkshire Hathaway, a multinational conglomerate holding company. Buffett is widely regarded as one of the most successful investors of all time.