A "Believe in Boston" flag flies during the duck boat parade celebrating the Boston Celtics' 18th NBA championship. The Boston Celtics' ownership group announced Monday that it plans to sell the team, according to a statement posted to the Celtics' account on social media site X. The controlling family of the ownership group, Boston Basketball Partners LLC, said it intends to sell all of its shares in the team "for estate and family planning consideration." As sports franchise valuations soar, the Celtics could fetch a particularly high price. The team is among the most successful and most widely followed in U.S. professional sports, and won its NBA record 18th championship last month.

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Organizations: Boston Celtics, NBA, Basketball Association, Celtics, Boston Basketball Partners, Phoenix Suns Locations: Boston