Gates up, Zuckerberg down in latest ranking of super-rich

Microsoft Chairman Bill Gates held onto his No. 1 position for the 19th straight year in Forbes' annual ranking of the 400 richest people in America.

Helped by the appreciation in Microsoft's stock in the last year, Gates' $66 billion net worth increased by $7 billion from a year earlier.

He was joined on the list by fellow tech moguls Oracle CEO Larry Ellison, whose $41 billion put him in the No. 3 spot. Amazon.com CEO Jeff Bezos finished 11th with $23.2 billion. Sergey Brin and Larry Page of Google held down the 12 and 13 spots with $20.3 billion apiece. Steve Ballmer, Microsoft's current CEO, ranked 19th with $15.9 billion, while Microsoft co-founder Paul Allen rounded out the top 20 with $15 billion.

Facebook's Mark Zuckerberg, ranked No. 11 in last year's Forbes list, fell to 36 with $17.5 billion.