1. Steve Ballmer: $42.4 billion (Los Angeles Clippers)
Steve Ballmer is an American businessman that rose to the position of CEO of Microsoft in 2000. Ballmer remained in that position until 2014, when he stepped down to pursue other ventures. Ballmer purchased the Clippers in 2014 for $2 billion. With a net worth over $42 billion, Ballmer is the richest owner in sports.