A familiar face takes over the top spot on Forbes' list of the world's richest billionaires.
6. David Koch (tie) -- The billionaire is co-owner (with older brother Charles) and an executive vice president of Koch Industries, a conglomerate that is the second-largest privately held company in the U.S. He's worth an estimated $40 billion.
Danny Moloshok / Reuters
iStock / bowdenimages
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