The Boston Celtics majority ownership group, led by Wyc Grousbeck, is planning to make the franchise available for sale.

Grousbeck and partner Steve Pagliuca led a group that purchased the team in 2002 for $360 million. Since then, franchise valuations have skyrocketed, with the latest teams to sell controlling shares being the Phoenix Suns, which went for $4 billion to Mat Ishbia in February 2023, the Milwaukee Bucks, with Jimmy and Dee Haslam paying $3.5 billion several weeks later, and the Dallas Mavericks, with the Adelson and Dumont families paying $3.5 billion in December.

The Celtics are one of the iconic franchises in professional sports, with an NBA record 18 NBA titles — trailing only…