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 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.

The ownership group led by Bill Chisholm has officially taken control of the team, and circulated a release to that effect with the team Tuesday.