The world's eight richest individuals have as much wealth as the 3.6bn people who make up the poorest half of the world, according to Oxfam, BBC reports.
The charity said its figures, which critics have queried, came from improved data, and the gap between rich and poor was "far greater than feared".
Oxfam's report coincides with the start of the World Economic Forum in Davos.
The world's eight richest billionaires
1. Bill Gates (US): co-founder of Microsoft (net worth $75bn)
2. Amancio Ortega (Spain): founder of Zara owner Inditex (net worth $67bn)
3. Warren Buffett (US): largest shareholder in Berkshire Hathaway (net worth $60.8bn)
4. Carlos Slim Helu (Mexico): owner of Grupo Carso (net worth $50bn)
5. Jeff Bezos (US): founder and chief executive of Amazon (net worth $45.2bn)
6. Mark Zuckerberg (US): co-founder and chief executive of Facebook (net worth $44.6bn)
7. Larry Ellison (US): co-founder and chief executive of Oracle (net worth $43.6bn)
8. Michael Bloomberg (US): owner of Bloomberg LP (net worth $40bn)
Source: Forbes billionaires' list, March 2016