3) Don King – Net Worth: $150 Million

American businessman Donald “Don” King is well-known for his boxing promotions. At the peak of his career, he promoted boxing stalwarts like Mike Tyson, Muhammad Ali, George Foreman, Larry Holmes, Evander Holyfield, Julio Cesar Chavez, Felix Trinidad, Andrew Golota, Marco Antonio Barrera and Roy Jones Jr. King is considered one of most successful boxing promoter of all-time.