BOSTON — The NBA on Wednesday unanimously approved the sale of the Boston Celtics to a group led by private equity mogul Bill Chisholm, a deal that values the franchise at more than $6.1 billion — the largest ever for an American professional sports team.

The league said the transaction is expected to close shortly. When it does, Chisholm will take ownership of at least 51% of the team, with full control coming by 2028 at a price that could bring the total value to $7.3 billion.

The previous record for a U.S. sports franchise was the $6.05 billion paid for the NFL’s Washington Commanders in 2023. The record price for an NBA team was the $4 billion that mortgage firm owner Mat Ishbia paid for the Phoenix Suns in 2023.

A Massachusetts native and graduate of Dartmouth College and Penn’s Wharton School of business, Chisholm is the managing partner of California-based Symphony Technology Group. The new ownership group also includes Boston businessmen Rob Hale, who is a current Celtics shareholder, and Bruce Beal Jr.

Wyc Grousbeck led the ownership group that bought the team in 2002 for $360 million and presided over NBA championships in 2008 and ‘24. The franchise’s 18 NBA titles is a record.

Chisholm outbid at least two other groups, including one led by previous Celtics minority partner Steve Pagliuca. Pagliuca has since announced plans to buy the WNBA’s Connecticut Sun for $325 million and move them to Boston, but the women’s league has balked at the deal.