#4. Paul Allen – Seattle Sounders – £12.12 billion
Paul Allen is one of the most well known businessmen on this list after co-founding Microsoft with his friend Bill Gates. While Microsoft has grown to become one of the most profitable companies on earth, Paul Allen’s personal wealth has grown with it. He hasn’t got as much as Gates but Allen’s fortune stands at around £12.12 billion. In 2008 he also co-founded MLS side Seattle Seahawks and now owns the club as well as the stadium. Sounders are still in their relative infancy but won the 2014 Supporters’ Shield and are led by Clint Dempsey in attack.