11 David Koch
David is late and he controlled Koch Industries, the second largest private U.S. firm, with his brother Charles, died in August 2019 at age 79.
Also, David Hamilton Koch was an American businessman, philanthropist, political activist, and chemical engineer.
He joined the family business Koch Industries, the second-largest privately held company in the United States, in 1970. Moreso, he was ranked as the 11th-richest men in the world 2019, with an estimated net worth of $50.5 billion.
