Celtics co-owner and billionaire financier, Stephen Pagliuca, and his wife, biotech investor Judy Pagliuca, have listed their sprawling Massachusetts home for $9 million.

Located in Weston, near Boston, the two purchased the estate in 1995 for $875,000, records show.

They later tore down the initial structure and built a sprawling 15,300-square-foot estate situated on 4 acres.

Sources tell The Post their “kids are grown and they’re ready to downsize.”

Several amenities have been added to the home in the span of nearly three decades, including two basketball courts, tennis courts, an indoor and outdoor pool, a spa, a gym, a movie theater, a game room with bar and a wine cellar.

Made up of seven bedrooms and nine baths, the home greets you with a two-story foyer, a banquet-sized dining room and a sitting room that leads to the garden, the listing notes.

The kitchen comes equipped with a breakfast room and an expansive pantry.

On the second level is the grand primary suite and six additional bedrooms.

Pagliuca, 68, a former co-chairman of Bain Capital, also built the house with an elevator.

Additionally, there is a separate 1,300-square-foot pool house.

George Sarkis of The Sarkis Team at Douglas Elliman holds the listing.

Weston is among the most desirable suburbs of Boston. In May, the average sale price for a single-family home there was $2.99 million, up 8.8% from the prior year.

A onetime Duke University basketball player, Pagliuca is a regular in the front row at Celtics games.

The team almost made it into the finals, but lost out in the semis against the Miami Heat.

In 2022, Pagliuca led an investor group’s purchase of a majority stake in Italian soccer club Atalanta, of which he is a co-owner and co-chairman.