The 20 richest people on the planet

Warren buffett bill gates ping pongREUTERS/Rick Wilking#1 and #3 duke it out.

Forbes is out with its annual list of the wealthiest people on the planet.

Microsoft founder Bill Gates remained in the top spot for the second year in a row, having added $US3.2 billion to his personal wealth.

Tech tycoons continued to dominate, with Larry Ellison, Mark Zuckerberg, Jeff Bezos, Larry Page, and Sergey Brin all appearing in the top 20. With the boom in Silicon Valley, Forbes notes that California is now home to 131 billionaires, “more than any other country besides China and the US.”

You can see Forbes’ complete billionaires list here; we’re taking a closer look at the top 20.

#20 Sergey Brin

Net worth: $US29.2 billion

Lost $US2.6 billion since 2014; dropped 1 spot on the Forbes list

Brin in the co-founder of Google, along with Larry Page.

#19 Larry Page

Net worth: $US29.7 billion

Lost $US2.6 billion since 2013; dropped 2 spots on the Forbes list

Page is the co-founder of Google, along with Sergey Brin.

#18 Sheldon Adelson

Net worth: $US31.4 billion

Lost $US6.6 billion since 2013; dropped 10 spots on the Forbes list

Shares of casino tycoon Sheldon Adelson's Las Vegas Sands Corp. were down 30% this year, largely due to a crackdown in Macau, where the company runs several properties.

#17 Li Ka-Shing

Net worth: $US33.3 billion

Gained $US2.3 billion since 2014; jumped 3 spots on the Forbes list

The richest man in Asia, Ka-Shing currently serves as chairman of Hutchison Whampoa, a conglomerate with interests in shipping and construction. He also holds a major real estate portfolio.

#16 Mark Zuckerberg

Net worth: $US33.4 billion

Gained $US4.9 billion since 2014; jumped 5 spots on the Forbes list

Zuckerberg is the founder and CEO of Facebook.

#15 Jeff Bezos

Net worth: $US34.8 billion

Gained $US2.8 billion since 2014; jumped 3 spots on the Forbes list

Bezos is the founder and CEO of e-commerce giant Amazon.

Disclosure: Bezos is an investor in Business Insider.

#14 Michael Bloomberg

Net worth: $US35.5 billion

Gained $US2.5 billion since 2014; jumped 2 spots on the Forbes list

Bloomberg, the former mayor of New York City, is the founder, CEO, and majority owner of Bloomberg LP.

#13 Bernard Arnault and family

Net worth: $US37.2 billion

Gained $US3.7 billion since 2014; jumped 2 spots on the Forbes list

Arnault and his family hold a 46% stake in LVMH Moet Hennessy Louis Vuitton, the world's largest maker of luxury goods.

#12 Samuel Robson Walton

Net worth: $US39.1 billion

Gained $US4.9 billion since 2014; jumped 2 spots on the Forbes list

A member of the founding family of Walmart, Walton has served as the head of the retail giant's board since 1992.

#11 Alice Walton

Net worth: $US39.4 billion

Gained $US5.1 billion since 2014; jumped 2 spots on the Forbes list

Walton, a daughter of Wal-Mart founder Sam Walton, is an heiress to the big box store fortune.

#10 Liliane Bettencourt and family

Net worth: $US40.1 billion

Gained $US5.6 billion since 2014; jumped 1 spot on the Forbes list

Bettencourt is the heiress to the L'Oreal fortune, and while she's still technically Europe's richest woman, a judge in October 2012 ordered that the elderly billionaire's fortune be placed under the legal control of her daughter and grandsons. The court case over her wealth is ongoing.

#9 Jim C. Walton

Net worth: $US40.6 billion

Gained $US5.9 billion since 2014; jumped 1 spot on the Forbes list

Another heir to the Walmart fortune, Jim is Chairman and CEO of the family's Arvest Bank, which has branches in Arkansas, Kansas, Oklahoma and Missouri.

#8 Christy R. Walton

Net worth: $US41.7 billion

Gained $US5 billion since 2014; jumped 1 spot on the Forbes list

Christy Walton inherited her husband John Walton's fortune when he passed away in 2005. John Walton's father was Walmart founder Sam Walton.

#6 (tie) David Koch

Net worth: $US42.9 billion

Gained $US2.9 billion since 2014; no change on the Forbes list

David, along with brother Charles, is a co-owner and the executive vice president of Koch Industries, one of the largest privately-held companies in the world.

#6 (tie) Charles Koch

Net worth: $US42.9 billion

Gained $US2.9 billion since 2014; no change on the Forbes list

Charles is a co-owner and executive vice president at Koch Industries along with his younger brother David.

#5 Larry Ellison

Net worth: $US54.3 billion

Gained $US6.3 billion since 2014; no change on the Forbes list

Ellison, founder of Oracle, did not even graduate from college. He was named entrepreneur of the year by Harvard Business School in 1990.

#4 Amancio Ortega Gaona

Net worth: $US64.5 billion

Gained $US.5 billion since 2014; dropped 1 spot on the Forbes list

Ortega is the former chairman of Inditex, a conglomerate whose holdings include global fashion retailer Zara.

#3 Warren Buffett

Net worth: $US72.7 billion

Gained $US14.5 billion since 2014; jumped 1 spot on the Forbes list

Buffett is the CEO of Berkshire Hathaway, as well as the company's primary shareholder. The company had a stellar year, leading to huge gains for Buffett.

#2 Carlos Slim Helu

Net worth: $US77.1 billion

Gained $US5.1 billion since 2014; no change on the Forbes list

Slim Helu came from humble beginnings. His father was an immigrant shoe maker and Slim built his fortune from almost nothing. And although he has billions now, friends say he wears cheap suits and prefers pen and paper to fancy computers.

#1 Bill Gates

Net worth: $US79.2 billion

Gained $US3.2 billion since 2014; no change on the Forbes list

Gates is the founder of Microsoft; he dropped out of Harvard after conceiving the company.

Now see where wealthy folks live.

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