9th and 10th Charles Koch and David Koch – Worth $39.6 Billion
The Koch brothers received the oil and gas refinery business from their father in 1967 when he left the world. Since then they increased the firm into Koch Industries with $100 Billion in sales. Koch Industries gratifies in chemicals manufacturing, pipelines, and commodities trading. Older brother Charles Koch inherited the company as the Chief Executive Officer initially. Now the brothers share control of the Koch Industries. Now There is an interesting thing that the younger brother holds the record for most points scored in a basketball game in MIT.