The Boston Celtics have completed a $6.1 billion sale, marking a record valuation for an American professional sports team. Private equity mogul Bill Chisholm officially took over ownership of the NBA franchise on August 19, 2025, after the NBA approved the transaction last week. The new ownership group includes four previously undisclosed investors: a co-founder of Klaviyo, an executive from the Ferrante Group, a co-founder of the esports company NIP Group, and an executive at the private equity firm Haveli. Steve Pagliuca, a former bidder who lost to Chisholm, congratulated the new ownership group and will retain an investment interest in the team through 2028 as part of the multi-part transaction. Wyc Grousbeck remains involved in the ownership structure, continuing his partnership with Chisholm. The new ownership group has expressed commitment to maintaining the Celtics' status as the NBA’s most-decorated franchise and pursuing further championships.