This year for the first time, everyone on Forbes magazine's annual list of the 400 richest Americans is a billionaire.
Microsoft founder Bill Gates tops the roster with a net worth of $53 billion. Investments expert Warren Buffett follows with $48 billion, though that will soon go down. Earlier this year, Buffett promised to give $37 billion to charity, most of it to the Bill and Melinda Gates Foundation.
Casino magnate Sheldon Adelson was in third place, after expanding his Las Vegas gambling franchise into Asia in 2004. Forbes says when he opened his $265 million casino on the Chinese island of Macau, he regained his entire investment in just a year.
Home-decor and media magnate Martha Stewart dropped off the list, after losing some $400 million in the past year.
Some information for this report was provided by AP and Reuters.