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3. The Koch brothers - $99 billion

Chemical engineer Fred Koch left an oil refinery firm to his two sons, Charles and David. After diversifying and expanding into other industries, Koch is now a multinational corporation with revenues of over $100 billion. The Koch brothers are not just famous for their father's company, however. These two have used their deep pockets to change the landscape of American politics by financing super PACs that lean toward conservative values. While David Koch passed away in August 2019, his brother and children carry on their political legacy.

WASHINGTON, DC - NOVEMBER 04: Koch Industries Executive Vice President Richard Fink (L) and Americans for Prosperity Foundation chairman and Koch Industries Executive Vice President David H. Koch listens to speakers during the Defending the American Dream Summit at the Washington Convention Center November 4, 2011 in Washington, DC. The conservative political summit is organized by Americans for Prosperity, which was founded with the support of Koch and his brother David H. Koch. Chip Somodevilla / Getty Images

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