Boston Celtics to be sold for a record $6.1 billion

The Boston Celtics will be sold for $6.1 billion.Winslow Townson/AP

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BOSTON — Private equity mogul William Chisholm agreed to buy the Boston Celtics on Thursday in a deal that values the NBA’s reigning champions and the most-decorated franchise in league history at a minimum of $6.1 billion — the largest price ever for American professional sports team.

If the deal is approved by the NBA’s board of governors this summer, the sale would top the $6.05 billion paid for the NFL’s Washington Commanders 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.…