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World's richest billionaires

Published On: Mar 08 2012 09:56:15 AM CST   Updated On: Mar 03 2014 09:32:55 AM CST

A familiar face takes over the top spot on Forbes' list of the world's richest billionaires.

Charles Koch
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6. Charles Koch (tie) -- Along with brother David, Charles is co-owner and executive vice president of Koch Industries, the second-largest privately held company in the U.S. He's worth an estimated $40 billion.

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