Winners and losers: The world's billionaires in 2015
The Bloomberg Billionaire's Index reveals how the planet's richest people fared last year
World Ranking: 11
\nEarnings: +$10.3B (+35.0%)
\nBrin is president of Alphabet, the holding company that owns Google, the world's largest search engine. Along with Larry Page, Brin founded the company in 1998.
World Ranking: 9
\nEarnings: +$10.8B (+36.2%)
\nPage is chief executive officer of Alphabet, the holding company that owns Google. He founded the firm alongside Sergey Brin in 1998. The Mountain View, California-based company handles more than 3 billion searches a day and had revenue of $66 billion in 2014. Other units include research division Google X.
World Ranking: 13
\nEarnings: +11.4B (+45.1%)
\nChina's richest man had a bumper year. Wang is the chairman and founder of Chinese conglomerate Dalian Wanda Group. The Beijing-based business has interests in commercial property development, a department store chain, tourism, hotels and entertainment centers.
World Ranking: 8
\nEarnings: +$11.9B (+34.5%)
\nZuckerberg is co-founder and chief executive officer of Facebook, the world's largest social-networking company. The site has more than 1.5 billion monthly users and had revenue of $12.5 billion in 2014. The Menlo Park, California-based company's initial public offering in 2012 was the biggest-ever technology IPO at the time.
World Ranking: 2
\nEarnings: +$12.9B (+21.2%)
\nIt was a good year for Ortega, who added nearly $13 billion to his net worth. Europe's richest person owns 59 percent of Inditex, the world's largest clothing retailer and parent of the Zara chain.
World Ranking: 4
\nEarnings: +$32.1B (+112.1%)
\nBezos earned himself more than anyone else on the planet last year - an extra $32 billion made its way to his bank account. He is the chairman and largest shareholder of Amazon, the world's biggest online retailer. Publicly traded Amazon had revenue of $89 billion in 2014.
World Ranking: 10
\nLosses: -$8.7B (-17.8%)
\nIt wasn't such a great year for Larry Elliison, who lost nearly $9 billion in 2015. Ellison is the founder and largest shareholder of Oracle, the world's biggest database company.
World Ranking: 23
\nLosses: -$9.3B (-23.8%)
\nWalton is the youngest child of Wal-Mart founder Sam Walton, and a principal owner of Walton Enterprises, one of two family holding companies that control more than 50 percent of Bentonville, Arkansas-based Wal-Mart, the world's biggest retailer and largest employer in the U.S. She donated her collection of American art to her museum, Crystal Bridges, in 2011.
World Ranking: 20
\nLosses: -$9.5B (-24.0%)
\nThe oldest son of Wal-Mart founder Sam Walton has been chairman of the world's largest retailer since his father's death in 1992. With his two surviving siblings and the estate of his late brother, Walton is a co-managing member of Walton Enterprises, one of two family holding companies that together control more than 50 percent of Wal-Mart.
World Ranking: 19
\nLosses: -10.2B (-25.0%)
\nThe youngest son of Wal-Mart founder Sam Walton heads Walton Enterprises, which together with another family holding company controls more than 50 percent of Bentonville, Arkansas-based Wal-Mart, the world's largest retailer. He owns the entity with his two surviving siblings and the estate of his late brother. He also oversees regional bank Arvest.
World Ranking: 3
\nLosses: -$11.1B (-15.0%)
\nThe 'Sage of Omaha' had a tough 2015, hurt by the downturn in commodity prices and the fall in the share price of American Express, IBM, Tesco and others. Buffett is the chairman and largest shareholder of Berkshire Hathaway, an Omaha, Nebraska-based company that runs a diverse collection of businesses.
World Ranking: 5
\nLosses: -$19.7B (-27.2%)
\nIt was a year to forget for Carlos Slim, who lost almost $20 billion. Mexico's richest man controls America Movil, the largest mobile-phone operator in the Americas. He has holdings in banking and mining, as well as stakes in publicly traded companies, including Philip Morris, New York Times and Caixabank.