The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Stated as firm, per the Associated Press report on NBC Boston published August 19, 2025: "The sale of the Boston Celtics was finalized on Tuesday ... the money changed hands on Tuesday."
Sportico on the close: governor and alternates, the two-stage structure and the comparison with the Commanders' $6.05 billion sale.
Front Office Sports: Chisholm "officially took over the Celtics on Tuesday"; Mittal's $1 billion, the four newly named investors and Pagliuca's exit.
The league's official release: unanimous approval of the sale of the controlling interest, the transaction "expected to close shortly".[1]
NBC Sports Boston on the approval and on Grousbeck moving from lead governor to alternate governor once the sale went through.
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