The United States has the most most billionaires on the list, with 413.
Carlos Slim was again at the top of the list. That's not a surprise. He was at the top last year. The Mexican business tycoon is worth $74 billion.
Gates takes the second spot. Forbes lists his net worth at $56 billion.
Reuters reports that Gates would have $88 billion if he weren't so philanthropic. Forbes backs that up, noting that Gates has given $30 billion to his foundation.
Warren Buffett is third on the billionaires' list. He, too, is giving away billions of dollars to charity. Reuters reports that he's given $6 billion to Bill Gates' foundation since 2006.