3. Charles & David Koch
Net Worth: USD 53.7 billion
Charles Koch has been attributed as successfully converting his father’s small oil business into a megalithic oil production industry. His brother, David Koch, was the Executive Vice President of Koch Industries until his retirement in 2018.
The Koch brothers are well-known for their involvement in US politics.
“I want my legacy to be greater freedom, greater prosperity and a better way of life for my family, our employees and all Americans. And I wish the same for every nation on earth.” – Charles Koch