I've watched Shark Tank from the first season. The radical majority of Cuban's deals in fact are minority positions. He very rarely buys controlling stakes.

His most valuable asset is time, and he's already loaded up on investments. He doesn't want to run the companies, so most of the time he prefers to retain the entrepreneurs or not invest, and he makes that clear routinely on Shark Tank.

Kevin is the shark that most frequently seeks complete buyouts.