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5. David Koch

5-david-koch

Reuters/Brendan McDermid

Net worth: $47.4 billion

Age: 75

Country: US

Industry: Diversified investments

Source of wealth: Inheritance/self-made; Koch Industries

Along with his brother Charles, David Koch runs Koch Industries as executive vice president. The second-largest private company, $115 billion (in sales) Koch Industries manufactures everything from fertilizer and Dixie Cups to asphalt and biodiesel.

Famously conservative, the brothers also maintain immense political influence and pledged to spend, along with their vast donor network, some $750 million on 2016 campaigns and causes. David tends to stay out of the spotlight more than his brother Charles, who announced in November that the brothers would not be backing any of the current GOP candidates in the primaries, a sign that they aren’t confident in the state of the party.

David has had two brushes with death. He survived a plane crash in 1991 in which everyone else in first class died, and he also won a battle with prostate cancer. He’s become one of the world’s most generous givers since, pledging to contribute more than $1.2 billion to cancer research, hospitals, education, and cultural institutions over his lifetime through his David H. Koch Charitable Foundation.

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