US President Donald Trump has fallen 222 places on the Forbes annual Rich List, after his estimated worth of $3.5bn (£2.5bn) fell to $3.1bn.
The magazine said the drop was partially due to a fall in the value of central New York property values and falling revenues at his golf courses.
Top of the list is the founder and boss of online giant Amazon, Jeff Bezos.
Mr Bezos’ fortune has leapt to $112bn from an estimated $39.2bn last year.
The improvement in Mr Bezos’ fortune is the biggest on record.
His rise knocks Microsoft founder Bill Gates, whose estimated wealth is $90bn this year, up from $86bn, into second place. Mr Gates has headed the list for 18 of the past 24 years.
A record 2,208 billionaires feature on the magazine’s 32nd annual ranking of the world’s billionaires.
US investment superstar Warren Buffett, who is worth $84bn, is third. His fortune is up from $75.6bn a year earlier.
The Forbes billionaires list is a snapshot of wealth taken on February 9, 2018. The magazine uses that day’s stock prices and exchange rates from around the world.