David Koch’s son is finding his own footing in sports, philanthropy and now politics. Forbes has exclusively learned that the 25-year-old namesake of the late conservative megadonor contributed $10,600 to a pair of political committees associated with Democratic presidential candidate Kamala Harris over the last three months, according to Federal Election Commission filings. The previously unreported donations by David Koch, Jr. are small change for a member of America’s second richest family (estimated net worth: $144 billion). But the endorsement of Joe Biden’s Vice President by a descendant of the Koch Brothers is surprising nonetheless.

David Koch, Sr. died of cancer in 2019 at age 79, leaving a 42% stake in $125 billion (revenue) conglomerate Koch, Inc. (formerly Koch Industries) to his widow Julia Koch, 62, and their three children. David’s brother Charles Koch, who still serves as chairman and co-CEO at age 88, and his family also own a 42% voting stake in the Wichita, Kansas-based business that their father Fred Koch (d. 1967) founded. Julia Koch and Charles’ son Chase, 47, are the only other family members who sit on the board, and Chase, who runs Koch, Inc.’s venture capital subsidiary, is the only other family member who works there with his father........

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