In a stunning, franchise-shaking move, the Celtics reached an agreement Wednesday to trade Jaylen Brown to the Philadelphia 76ers, according to a report from ESPN’s Shams Charania.

In return, Boston reportedly will receive nine-time All-Star wing Paul George, two first-round picks and two second-round picks.

Brown had been the subject of rampant trade rumors in recent weeks, with Charania reporting earlier Wednesday that the Celtics were “strongly shopping” their longest-tenured player following a failed attempt to trade him and two draft picks for Giannis Antetokounmpo.

But the 76ers, who ended the Celtics’ 2022-26 season by upsetting them in the first round of the NBA playoffs, had not been mentioned as a potential suitor for Brown. He’ll now join the likes of Joel Embiid, Tyrese Maxey and VJ Edgecombe on a talented Philadelphia roster, while the oft-injured George heads to Boston.

Shipping out Brown splits up one of the NBA’s most talented and successful duos. The tandem of Jayson Tatum and Brown led Boston to five Eastern Conference finals, two NBA Finals and one championship since they joined forces in 2017.

Brown, the 2024 NBA Finals MVP, played most of this season without his longtime co-star, and he thrived, averaging 28.7 points, 6.9 rebounds and 5.1 assists — a stat line matched in Celtics history only by Larry Bird and John Havlicek — while Tatum recovered from Achilles surgery. Brown made second-team All-NBA and finished sixth in MVP voting, and the underdog Celtics far exceeded preseason expectations, posting the second-best record in the East (56-26) and the league’s fourth-best net rating.

But questions about Brown’s future began swirling after Boston blew a 3-1 series lead against seventh-seeded Philly, losing three straight — including Game 7 at home, which Tatum missed due to knee stiffness — to suffer their earliest postseason exit since 2021.

Brown, who was a minus-57 over the final three losses, made headlines after the series when he insisted that this was his “favorite season” despite Boston’s poor finish. Basketball Hall of Famer Tracy McGrady, a mentor of Brown’s, did the same when he said on his podcast that Brown had “frustration (that) lies deeply within the (Celtics) organization.”

Celtics president of basketball operations Brad Stevens said in his end-of-season news conference that Brown had expressed no such feelings to him. But Stevens admitted Boston needed to improve its roster to compete with the NBA’s elite teams (New York, San Antonio, Oklahoma City, etc.). A month later, after the Milwaukee Bucks rejected Boston’s bid for Antetokounmpo, Stevens said he wouldn’t “predict the future” when asked whether Brown would remain with the Celtics.

“Jaylen Brown is a big part of us,” Stevens said last Tuesday. “I’m never going to predict the future, but every indication, everything that I think about over the past few years has been building around those guys, right? So obviously, you never know.

“But at the same time, the one thing I want to make very clear is how valued he’s always been. He’s been amazing. He’s been an amazing teammate, a great person to be around. And whether that run ends 10 years from now when he retires, or before, there’s a lot to celebrate. We have a great relationship, an open relationship where we talk about everything. But I don’t want to predict the future.”

George has enjoyed a long and decorated career across stints with the Indiana Pacers, Oklahoma City Thunder, Los Angeles Clippers and 76ers. Over his 16 seasons, he’s averaged 20.5 points, 6.2 rebounds, 3.7 assists and 1.7 steals per game while shooting 44.0% from the field and 38.4% from 3-point range.

The 36-year-old is well past his prime, however, and has struggled to stay on the court, suiting up for more than 60 games just once in the last seven seasons. He played in 37 games this season, missing time for both injuries and a 25-game suspension for violating the NBA’s anti-drug policy.

George did give the Sixers strong minutes during their playoff series against Boston, making 55.0% of his 3-pointers across the seven games. Still, he’s a substantial downgrade from both the Celtics’ original target, two-time NBA MVP Antetokounmpo, and Brown, who is six years younger.

The Celtics will inherit the final two years of George’s contract. He’s set to make $54.1 million this coming season, then has a $56.6 million player option for 2026-27. It was not immediately clear whether Boston plans to move forward with George or flip him in a subsequent trade.

This trade marks the third time in the last four offseasons that the Celtics made major changes to their roster. Ahead of the 2023-24 season, they shipped out Marcus Smart, Robert Williams III and Malcolm Brogdon in trades for Kristaps Porzingis and Jrue Holiday — deals that helped push their Tatum/Brown-led core over the championship hump after years of near misses. Last summer, the Celtics traded Porzingis and Holiday and lost Al Horford and Luke Kornet in free agency to escape the prohibitive second apron of the NBA’s luxury tax. (A subsequent series of in-season trades pushed Boston out of the tax entirely.)

Parting ways with Brown is the boldest swing yet for Stevens.

The 29-year-old (30 in October) was Boston’s longest-tenured player, having joined the C’s as the No. 3 overall pick in the 2016 NBA Draft. He ranks 10th on the franchise’s all-time scoring list — one spot behind Tatum and two behind Bill Russell — and is coming off the best season of his career. Among active players, only Stephen Curry, Draymond Green, Devin Booker, Nikola Jokic and Antetokounmpo have appeared in more games without changing teams.

Brown, whose No. 7 likely will hang in the TD Garden rafters one day, also built a strong connection with the Boston community through his 7uice Foundation, Boston XChange initiative and other philanthropic efforts.

“I love Boston,” he said in a May 6 Twitch stream. “If it were up to me, I would play in Boston for the next 10 years.”

Brown was set to become eligible for a two-year, $140 million contract extension with the Celtics next month. His current deal, which runs through the 2028-29 season, was the richest in NBA history when he signed it in 2023 (five years, $304 million). He is set to make $57.1 million this coming season.