Forbes released its annual list of the 400 richest Americans today, and there has been a bit of a shakeup in the top 10.Billionaires George Soros and Sheldon Adelson have dropped out of the top tier, while New York Mayor Bloomberg and one of the many heirs to the Walmart fortune have moved up.
Last year: $25 billion
David, along with brother Charles, is a co-owner and the executive vice president of Koch Industries, one of the largest privately-held companies in the world.
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