Answer
Fenway Sports Group (FSG) acquired controlling interest in the Pittsburgh Penguins from Mario Lemieux in 2021. FSG is a sports investment firm that owns several professional sports teams, including the Boston Red Sox (MLB), Liverpool F.C. (EPL), and the Pittsburgh Penguins (NHL). The sale marked a significant change in ownership for the Penguins, who had been under Lemieux's control for over two decades.