The deal will close in two phases, with Chisholm’s group taking 51 percent ownership now, and the balance closing in 2028.

The Boston Celtics have a new owner, and there's one thing that isn't going to change at the NBA's most-decorated franchise."Coming in second is not the objective, and it’s not acceptable," private equity mogul Bill Chisholm said Tuesday after taking control of the team from Wyc Grousbeck.

The Boston Celtics now officially belong to Bill Chisholm. The investor group led by the Chisholm has completed its acquisition of the majority control of the franchise, the Celtics announced Tuesday.