9 of the 34 have more than one team in a major sports league. Still others on the list have turned sports into a multi-team, multi-sport business of its own. The NFL requires a controlling owner to hold at minimum a 30% stake in the team and forbids ownership groups of over 24 people, or any publicly traded corporations from purchasing NFL teams; one team, the Green Bay Packers, is exempt from this under a grandfather clause and is owned by shareholders.

Real estate tycoon Stan Kroenke …

We would like to show you a description here but the site won’t allow us. Mark Cuban, owner of the Dallas Mavericks, is bidding to purchase …

The general consensus is that all things being equal, sports leagues would rather have one owner per team, the better to reduce logistical headaches. William Davidson owns the Detroit Pistons (NBA) and Tampa Bay Lightning (NHL).