http://news.bbc.co.uk/1/hi/business/3121428.stm
US RICH LIST
Bill Gates: $46bn
Warren Buffett: $36bn
Paul Allen: $22bn
Walton heirs: $20.5bn each
Larry Ellison: $18bn
Michael Dell: $13bn
Steve Ballmer: $12.2bn
Cox heirs: $11bn each
John Kluge: $10.5bn
Mars heirs: $10.4bn each
Sumner Redstone: $9.7bn
Tech winners
Nor was there any change in the second and third positions.
For the second year in row, they went to investment guru Warren Buffet, with $36bn, and Microsoft co-founder Paul Allen, who is worth $22bn.
The main winners came from the technology sector - with Larry Ellison of Oracle, Michael Dell of Dell Computers, and Steve Ballmer of Microsoft all seeing their wealth increase.
Amazon.com chief Jeff Bezos' fortune jumped by $3.1bn to $5bn in line with a sharp increase in his company's share price.
Yahoo co-founder David Filo also made impressive gains, with his personal fortune rising threefold to $1.6bn.
Other winners came from the media sector, with the two daughters of the owner of cable operator Cox Communications, radio and TV owner John Kluge of Metromedia, and Sumner Redstone of Viacom all worth around $10bn each.
The five children of Sam Walton, the founder of Wal-Mart, are worth $20.5bn each - making that family collectively the richest on the list.