The world's top ten richest people will increase their value by more than $400 billion in 2021 Musk alone contributed 30%.

According to the Bloomberg Billionaires Index, the world's top ten richest people are worth more than $100 billion.

Some of them, like Bill Gates and Jeff Bezos, have had $100 billion in assets for quite some time: Gates first reached that level in 1999, while Bezos reached the 100 billionaire standard in 2017. But most of the others are new members of the 100 billion dollar club.

In 2021, the net worth of the world's top ten richest people increased by $402 billion. Tesla CEO Elon Musk became the biggest winner, his wealth increased by nearly $120 billion, and he is now worth $274 billion, making him the world's richest man.

Tesla's wealth growth is largely due to the rapid expansion of its electric vehicle manufacturing business. Tesla's stock is up about 60 percent this year, and the company's market capitalization surpassed $1 trillion for the first time in October.

Amazon founder Jeff Bezos, who topped the list earlier this year, fell to second place and his net worth is now $194 billion, an increase of just nearly $4 billion.

Bezos, 57, stepped down as Amazon's CEO in July and said he would spend more time on projects such as the Bezos Earth Fund, Blue Origin Spacecraft and The Washington Post.

Bernard Arna Arnault, ceo of the world's third-richest luxury goods company, has increased his fortune by $62.7 billion this year.

Arnault is the only French billionaire in the top ten who is not An American, and his LVHSM group owns well-known brands such as Louis Vuitton, Dior and Givenchy, and the 72-year-old Arnault is also the richest man in Europe.

Microsoft founder Bill Gates' fortune increased by $6.6 billion, ranking fourth in the world with $138 billion. While he has long since stepped down as chairman of Microsoft and has donated tens of billions of dollars to charities over the years, his wealth continues to grow, thanks in part to the excellent performance of Microsoft stock, where Gates holds about 1 percent of the shares.

Thanks to Alphabet's strong performance in 2021, Google founder Larry Page's net worth increased by $47 billion, making him in the top five worldwide with a fortune of $129 billion. He stepped down as CEO of Google's parent company Alphabet in 2019, but remains a member of the board.

Facebook CEO Mark Zuckerberg, 37, the only member of the top 10 richest people under the age of 40, has increased his wealth by nearly $25 billion in the past year to $128 billion in total assets. Zuckerberg holds a 13 percent stake in Meta, the parent company of Facebook, and the company's market capitalization has grown by more than 26 percent this year.

Sergey Brin, another co-founder of Google, has increased his net worth by about $45 billion this year, surpassing $100 billion for the first time. He holds about 38 million shares of Alphabet and is also a member of the company's board.

Steve Ballmer, former Microsoft CEO and Los Angeles Clippers owner, has seen his fortune rise by $40 billion, and his wealth growth has been boosted by growth in tech stocks such as Microsoft, which has seen its market capitalization grow by more than 54 percent this year.

Warren Buffett's wealth increased by $21.9 billion, and his net worth exceeded $110 billion. Buffett, 91, has pledged to donate all of his stake in Berkshire Hathaway to charity. In June, he said the target was halfway through.

Oracle co-founder and chairman Larry Ellison's wealth increased by $28.4 billion, and his net worth exceeded $100 billion. Oracle shares hit their second-highest gain in 20 years this year.

For most of the world's richest people, the vast majority of their net worth is stocks, whose earnings are driven by booming markets. As 2021 draws to a close, major U.S. stock indexes are nearing record highs this year, fueled by historic fiscal and monetary stimulus.