21 Richest Billionaires In The World

8. Michael Bloomberg

Facebook CEO Mark Zuckerberg talks about the new Facebook email service at an announcement in San Francisco, Monday, Nov. 15, 2010. AP Photo/Paul Sakuma)
Thibault Camus/AP

Rating: $35.5 Billion

The former Mayor of New York grew his wealth massively as founder, CEO and majority shareholder of the company that bears his name.

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