These are the 50 richest people in the world right now

There's rich. And then there's world's richest people rich.

To make it into the latter group, you now need a net worth of at least $19.8 billion.

Using the calculations from the Bloomberg Billionaires Index, we put together a list of the 50 richest people in the world. Bloomberg updates its data at the close of every trading day in New York, and our list is based on the latest data available for February 15. Since Bloomberg News doesn't report on Bloomberg LP, we added him using his estimated net worth from Forbes.

The majority of the billionaires on the list are self-made self-starters who built business empires in tech, finance, fashion, and sports. A few inherited stakes in their family's companies.

From tech tycoons to luxury car heiresses, here are the 50 richest people on earth.

Elena Holodny contributed to a previous version of this article.

50. Tadashi Yanai

Tadashi Yanai is the the founder and president of Fast Retailing, which owns retailer Uniqlo.

Net worth:$19.8 billion

Age:68

Citizenship:Japan

Industry:Retail

Source of wealth:Self-made

49. Vladimir Potanin

Vladimir Potanin started his private investment company Interros in the early 1990s, which is invested in mining, metals, energy, finance, and real estate. Interros owns 30% of the Russian nickel company Norilsk Nickel.

Potanin has served as the President of the United Export Import Bank, the first Deputy Prime Minister of the Russian Federation, and currently heads the National Council on Corporate Governance.

Net worth:

Age:

Citizenship: Russian Federation

Industry: Nickel

Source of wealth: Self-made

48. Robert Kuok

Robert Kuok is Malaysian-Chinese buinessman who has massive businesses in Malaysia, Hong Kong, and Singapore in areas such as sugar, palm oil, hotels, and trading, among others.

His businesses are primarily privately-held by him and his family and Kuok is notoriously media-shy.

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Source of wealth: Self-made

47. Lakshmi Mittal

Lakshmi Mittal is the CEO of ArcelorMittal, the world's largest steelmaker. His father, Mohanlal Mittal, ran a steel company, but Mittal founded his own steel factory in Indonesia in 1976. Mittal Steel merged with Luxembourg-based Arcelor in 2006. It now produces 10% of the world's steel.

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Citizenship: India

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Source of wealth: Self-made

46. Lee Kun Hee

Lee Kun Hee is the chairman of Samsung Electronics, which is known for its consumer electronics division. He remains hospitalized after suffering a heart attack in 2014.

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Citizenship: Republic of Korea

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Source of wealth: Inherited;

45. Alexey Mordashov

Alexey Mordashov is a Russian oligarch who built his fortune as steel company Severstal's majority shareholder. He was the company's CEO for 19 years until 2015. He also has stakes in mining, media, banking, telecom, and, recently, technology.

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Citizenship: Russian Federation

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Source of wealth: Self-made

44. Elon Musk

Elon Musk is the CEO of Tesla, which makes electric cars. He's also the CEO of SpaceX and founded OpenAI and Neuralink.

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Source of wealth: Self-made

43. Len Blavatnik

Soviet-born American Len Blavatnik founded Access Industries in 1986. It began with only Russian investments, but now includes a diverse portfolio. He purchased 20% stake in Tory Burch, now a retail powerhouse, in 2004, becoming the first and largest outside investor in the company.

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Source of wealth: Self-made; Access Industries

42. Michael Dell

Michael Dell started PC Ltd., the predecessor to Dell Inc., while he was a premed student in 1984. He dropped out of college to build computers full time, and the company went public by the time he was 23.

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Source of wealth: Self-made; Dell

41. Thomas Peterffy

Thomas Peterffy is the chair, CEO, and founder of Interactive Brokers Group, a huge electronic broker.

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Source of wealth: Self-made; Interactive Brokers

40. Yang Huiyan

Yang Huiyan controls Chinese real estate developer Country Garden Holdings. According to Bloomberg, her father co-founded the company in 1992 and then transferred his stake to her in 2005.

Net worth: $21.6 billion

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Source of wealth: Inherited;

39. Stefan Quandt

Stefan Quandt inherited a stake in

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Citizenship: Germany

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Source of wealth: Inherited; BMW

38. Leonardo del Vecchio

Leonardo del Vecchio started Luxottica, the eyewear powerhouse, in 1961 in Milan. It owns Sunglass Hut, Ray-Ban, and Oakley, and manufacturers glasses for a large number of luxury brands.

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Source of wealth: Self-made; Luxottica Group

37. Dieter Schwarz

Dieter Schwarz joined his father's business in 1973 and soon opened the company's first discount supermarket. After his father died, he took over as CEO and expanded the business outside of Germany. The company operates Lidl, a grocery-store chain, and Kaufland, which is similar to Walmart.

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Source of wealth: Self-made; Schwarz Gruppe

36. Giovanni Ferrero

Giovanni Ferroro controls Ferrero SpA, which makes Ferrero chocolates, Nutella, Kinder chocolates, and Tic Tacs.

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Source of wealth: Inherited;

35. Lee Shau Kee

Lee Shau Kee founded Henderson Land Development, which grew into a top real-estate developer in Hong Kong and China, in 1973.

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Source of wealth: Self-made; Henderson Land Development

34. Susanne Klatten

Susanne Klatten inherited a stake in

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Source of wealth: Inherited; BMW

33. Serge Dassault

Serge Dassault is the CEO of Dassault Group, which has a controlling stake in military jet maker Dassault Aviation.

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Citizenship: France

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Source of wealth: Inherited;

32. Georg Schaeffler

After serving in the German military and working in corporate law stateside, Georg Schaeffler joined his father's company Schaeffler Group, which manufactures ball bearings for auto, aerospace, and industrial use. He is the chair and majority owner.

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Source of wealth: Inherited/self-made; Schaeffler Group

31. Paul Allen

Paul Allen, Microsoft co-founder, left the company before it went public. He remained a board member until 2000, and reduced his stake in the firm over time. He also founded Vulcan, his private investment vehicle.

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Source of wealth: Self-made; Microsoft

30. Francois Pinault

Francois Pinault founded luxury goods group Kering, which controls Gucci and Puma, among others.

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Source of wealth: Self-made;

29. Wang Jianlin

Wang Jianlin is the founder and chair of conglomerate Dalian Wanda Group, which has interests in a large number of companies, including property development, department stores, and entertainment.

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Source of wealth: Self-made; Dalian Wanda Group

28. Jorge Paulo Lemann

Jorge Lemann worked as a journalist and professional tennis player before jumping into finance in 1971. He co-founded 3G Capital in 2004, and has become known for his affinity for merges and acquisitions.

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Source of wealth: Self-made; 3G Capital

27. Phil Knight

Back in the 1960s, Phil Knight started a company that distributed Japanese sneakers in the US under the name Blue Ribbon Sports — which was the predecessor to Nike. He transformed a passion for running into a full blown sneaker and celebrity athletes empire.

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Source of wealth: Self-made; Nike

26. Hui Ka Yan

Hui chairs China Evergrande Group, a property developer that has worked on hundreds of projects across nearly 200 cities in China.

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Source of wealth: Self-made;

25. and 24. John Mars and Jacqueline Mars

Siblings John, Jacqueline, and the late-Forrest Mars inherited a stake in Mars, Inc. after their father died in 1999. The siblings are notoriously private, and don't actively manage the candy maker company. But they do run the Mars Foundation,

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Source of wealth: Inherited; Mars Inc.

23. Li Ka-Shing

Li Ka-shing dropped out of school at 16 to support his family by working in a factory making plastic flowers. He opened his own factory six years later — the predecessor to today's CK Hutchinson Holdings, which has interests in real estate, energy, and telecoms.

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Source of wealth: Self-made; CK Hutchinson Holdings

22. Steve Ballmer

Steve Ballmer dropped out of business school at Stanford to become Microsoft's first business manager with a salary of $50,000 and a stake in the company. He eventually became CEO after Bill Gates stepped down and held the post until Satya Nadella replaced him in 2014.

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Source of wealth: Self-made; Microsoft

21. Sheldon Adelson

Sheldon Adelson and partners developed Computer Dealer's Exhibition (COMDEX), one of the largest trade shows in Las Vegas. He sold the company to Japan's Softbank for $860 million in 1995, and used the money to finance his purchase of the Sands Casino. He demolished that, and built the Venetian Casino Resort and the Sands Expo Convention Center in its place. In 2015, he bought Nevada's largest newspaper.

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Source of wealth: Self-made; Las Vegas Sands

20. Mukesh Ambani

After his father died in 2002, Mukesh Ambani took over as chairman of Reliance Industries. He now controls about 40% of the company, which owns the world's largest oil refining complex.

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Source of wealth: Inherited/self-made; Reliance Industries

19. Pony Ma

Ma Huateng, also known as Pony Ma, founded Tencent Holdings, which has a number of Internet and communication platforms in its portfolio, in 1998 when he was 26. Among others, its platforms include WeChat and QQ.

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Citizenship: China

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Source of wealth: Self-made; Tencent Holdings

18. Francoise Bettencourt Meyers

Francoise Betterncourt Meyers is now the heiress to the L'Oreal cosmetics fortune after her mother's death in September 2017. She controls 33% of the company, according to Bloomberg.

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Source of wealth: Inherited; L'Oreal Group

17. Alice Walton

Alice Walton is the youngest heir to Helen and Sam Walton's Walmart fortune. She hasn't taken an active role in running the superstore empire, but she co-manages Walton Enterprises, one of the family's two holding companies.

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Source of wealth: Inherited; Walmart

16. David Koch

David Koch runs Koch Industries as executive vice president with his brother, Charles. Koch Industries manufactures, refines, and distributes a wide range of things, including chemicals, energy, minerals, and more.

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Source of wealth: Self-made; Koch Industries

15. Charles Koch

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Source of wealth: Self-made; Koch Industries

14. Jim Walton

James "Jim" Walton

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Citizenship: United States

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Source of wealth: Inherited; Walmart

13. Jack Ma

Jack Ma started e-commerce company Alibaba with just $60,000 in 1999. Fifteen years later, it broke records with a $25 billion initial public offering.

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Citizenship: China

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Source of wealth: Self-made; Alibaba

12. Rob Walton

Samuel Robson "Rob" Walton is the oldest son of Walmart founders Helen and Sam Walton. He started working at the superstore empire back in 1969 and served as chairman from 1992 to 2015.

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Source of wealth: Inherited; Walmart

11. Michael Bloomberg

After being fired by Salomon Brothers, Bloomberg founded his eponymous financial-data firm in 1981. He added the news and media subsidiary in 1990, but the majority of Bloomberg LP's revenue continues to come from the sale of terminals. He later served as mayor of New York City for three terms.

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Citizenship: United States

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Source of wealth: Self-made; Bloomberg LP

10. Sergey Brin

Sergey Brin co-founded Google with Larry Page back in 1998. He is now the president of Alphabet, which is the company that owns Google.

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Source of wealth: Self-made; Google

9. Larry Page

Larry Page co-founded Google with Sergey Brin in 1998. He is now the CEO of Alphabet, which is the company that owns Google.

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Source of wealth: Self-made; Google

8. Larry Ellison

Larry Ellison teamed up with two colleagues from an electronics company in 1977 to start their own programming firm, which then shortly landed a contract to build a relational database-management system for the CIA. The project later grew into what's known today as Oracle Corp., the second largest software maker behind Microsoft. He stepped down as CEO in 2014.

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Source of wealth:Self-made; Oracle

7. Bernard Arnault

Bernard Arnault is the chair of LVMH Moet Hennessy Louis Vuitton, which houses dozens of luxury brands. Arnault bought Christian Dior when he joined the business, and helped revive the company.

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Source of wealth:Self-made/Inheritance; LVMH

6. Carlos Slim

Carlos Slim owns a large number of companies in Mexico through his conglomerate, Grupo Carso. He also controls America Movil, the largest operator of mobile phones in Latin America.

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Citizenship:Mexico

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Source of wealth:Self-made; Grupo Carso

5. Amancio Ortega

Amancio Ortego controls fashion giant Inditex, which owns Zara, Massimo Dutti, Oysho, and others. At least part of his success can be attributed to Zara's fast-fashion business model.

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Source of wealth: Self-made; Inditex

4. Mark Zuckerberg

Mark Zuckerberg launched TheFacebook.com when he was a sophomore in college before dropping out to work on the site full-time.

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Source of wealth: Self-made; Facebook

3. Warren Buffett

After getting rejected from Harvard Business School, Warren Buffett went to Columbia instead where he studied under Benjamin Graham, who would become his mentor. He later bought Berkshire Hathaway in 1969 and transformed it into a powerhouse holding company.

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Source of wealth: Self-made; Berkshire Hathaway

2. Bill Gates

Bill Gates co-founded Microsoft with his friend Paul Allen, and served as CEO until 2000. He still sits on the company's board, but is no longer active in the day-to-day dealings.

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Citizenship: United States

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Source of wealth: Self-made; Microsoft

1. Jeff Bezos

Jeff Bezos founded Amazon.com in the garage of his Seattle home in 1994. The online marketplace went public three years later and has since grown to sell everything from fashion to tech to food and Amazon's own consumer-electronics products.

On November 24, 2017 — Black Friday — Bezos's net worth hit $100 billion.

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Source of wealth: Self-made; Amazon