Mexican tycoon Carlos Slim remains the world's richest man for the fourth year in a row, according to Forbes magazine.
Warren Buffett dropped out of the top three for the first time since 2000.
And Facebook's Mark Zuckerberg saw his ranking drop 31 spots as his net worth declined by $4.2bn (£2.8bn) dollars.
A record 1,426 people around the world made the US magazine's latest annual count of billionaires, up 16% from last year.
The US has the most billionaires in the world, with 442.
Mr Slim's net worth increased to $73bn (£48bn) dollars from $69bn (£46bn) a year earlier. Bill Gates of Microsoft held on to second place with a net worth of $67bn (£44bn) dollars.
There were 138 women on the list. Liliane Bettencourt – whose family owns a stake in L'Oreal – is the world's richest woman with a net worth of $30bn (£20bn).