Wednesday, October 28, 2026

Grousbeck’s Big Bet: Can Owner’s Spending Keep Celtics on Top?

  • The high-spending team faces more rising costs heading into its title defense.
  • The team owner is an active investor across the sports industry and even had a sitcom about his life.
Peter Casey-USA TODAY Sports

Want more from Front Office Sports
in your search results?

Add Front Office Sports on Google

The Celtics, now owners of an NBA-record 18 championships, are already the clear favorite to repeat next year as champions. But doing so will likely come with heavy financial costs and will test the mettle of team owner Wyc Grousbeck (above, holding trophy), who quietly has become one of the most influential executives across the sports industry.

Operating without a megastar such as the Lakers’ LeBron James or the Warriors’ Stephen Curry, the Celtics in some ways have become an East Coast version of Golden State, traditionally one of the NBA’s top-spending teams and one that used financial muscle to help build a modern-day dynasty. Boston’s 2023–24 payroll of $184 million ranked fourth, according to Spotrac—trailing only the Warriors, Clippers, and Suns—and stood above the league’s luxury tax threshold of $165.3 million. That, in turn, set up a luxury tax bill for the Celtics of nearly $40 million. 

As is often the case for newly minted champions, though, maintaining current levels is not an option in Boston, and next year’s figures will be higher across the board. The NBA luxury tax threshold is rising to $171.3 million. Already, though, the Celtics have more than $192 million in contract obligations for the 2024–25 season. 

Further bills are also likely coming due as forward Jayson Tatum is reportedly eligible for a supermax contract extension that would pay him $315 million over five years. Combined with teammate Jaylen Brown’s five-year, $304 million deal signed last summer, setting a league record, the pair could be set to receive $480 million between 2025 and ’29.

Paying the luxury tax again next season will establish the Celtics as repeat offenders of going over the NBA’s soft salary cap, and further penalties kick in once a team pays the tax in three of the prior four seasons.

The Man Signing the Checks

Grousbeck, however, has shown not only a willingness to dig deep in support of the Celtics, but also has been one of the most active investors in recent years across the industry. Primarily through the investment firm he cofounded, Causeway Media Partners, Grousbeck has invested in companies such as ticketing operator SeatGeek, streaming outlet FloSports, and internet radio provider TuneIn, among many others. 

The owner also is a backer of the John Henry–led Strategic Sports Group that completed an investment deal worth up to $3 billion with the PGA Tour to create a new for-profit commercial entity, PGA Tour Enterprises. 

That’s not the only tie for Grousbeck to his Boston-area pro team ownership colleagues. Grousbeck also collaborated last year with Henry’s key partner, Fenway Sports Group chairman and fellow Strategic Sports Group investor Tom Werner, to develop a situation comedy inspired by Grousbeck’s life. The show, Extended Family, debuted in December on NBC and starred Jon Cryer and Donald Faison, with former Celtics stars such as Paul Pierce and Rick Fox holding smaller roles. Thirteen episodes aired, but the network did not pick up Extended Family for a second season. 

Download the FOS App

The business of sports, in your pocket.

QR code to download the app

Scan the QR code to get the app now.

Linkedin
Whatsapp
Copy Link
Link Copied
Link Copied

What to Read

Basketball - EuroLeague - Virtus Bologna v Maccabi Tel Aviv - PalaDozza, Bologna, Italy - November 21, 2025 Virtus Bologna's Carsen Edwards reacts

NBA Europe’s Promise Comes With an Americanization Risk

“The energy around European basketball is undeniable right now.”
Apr 3, 2026; Indianapolis, IN, USA; Ernie Johnson looks on during a practice session ahead of the Final Four of the men's 2026 NCAA Tournament at Lucas Oil Stadium.

Ernie Johnson Leaving ‘Inside the NBA’ After 37 Years

He’ll still be around for March Madness and other projects for TNT and CBS.

Mavs’ Miriam Adelson Leads All Sports Owners in Midterms Spending

Adelson spent at least $67 million on Republican races.

NHL Winter Classic Weekend Expanding Amid Utah’s Sports Push

The “Winter Weekend” includes events with the Jazz, Mammoth, and a concert.
podcast thumbnail mobile
Front Office Sports Today

10/28/26 – Brewers Economy on Fire, Knicks and Rangers Split, Who Will Join Jay-Z at Halftime?

0:00

Featured Today

Football - NFL - Houston Texans v Jacksonville Jaguars - Wembley Stadium, London, Britain - October 18, 2026 The necklace of a Jacksonville Jaguars fan outside the stadium before the match

Die-Hard Sports Fandom Has Reached the Afterlife

Will fans pay $6,000 to memorialize their team loyalty?
October 20, 2026

Why Europe Is Pumping Out NBA Superstars

The NBA and NCAA have an increasingly European flavor.
October 15, 2026

College Flag Football Is Outgrowing Its DIY Era

Women have been building the college game themselves at the club level.
Oct 5, 2026; Pittsburgh, Pennsylvania, USA; Pittsburgh Penguins general manager Kyle Dubas arrives at the arena before the Penguins host the Winnipeg Jets at PPG Paints Arena
October 12, 2026

NHL’s New Wave of GMs Is Built Different

“I am in the prediction business,” Devils GM Sunny Mehta tells FOS.
Action Images/Peter Cziborra
October 9, 2026

Is Leicester City’s $264 Million Price Tag Too Rich for Hungry Investors?

After falling from grace, how much is a former top club worth?
Oct 8, 2026; Arlington, Texas, USA; The Dallas Cowboys cheerleaders perform during the game between the Cowboys and the Buccaneers at AT&T Stadium

Why the Dallas Cowboys Cheerleaders Are Unionizing

Will the cheer squad get what they want at the bargaining table?
October 27, 2026

Carlie Irsay-Gordon Reshaping Colts As Fire Sale Begins

The Colts traded Quenton Nelson and DeForest Buckner on Tuesday.
October 28, 2026

Chiefs Bring In Justin Tucker As Their $25.6M Kicker Struggles

The former All-Pro gives K.C. an alternative to struggling Harrison Butker.
Sponsored

How the New York Yankees Stay Game-Ready with Sage Intacct

See how Sage Intacct helps the Yankees streamline finances and plan for the future.
Jun 18, 2026; New York, NY, USA; CEO of MSG Network James Dolan smiles during the New York Knicks Championship Parade through the Canyon of Heroes.
October 27, 2026

James Dolan Gets $10M Bonus As Knicks-Rangers Spin-Off Closes

“It’s a healthy award,” an executive compensation expert tells FOS.
October 27, 2026

Panthers Laying Groundwork for On- and Off-Field Transformation

Carolina’s Bank of America Stadium will undergo a $1.3 billion renovation.
Milwaukee Brewers fans cheer on their team during the ninth inning of Game 3 of the World Series Monday, Oct. 26, 2026 at Tropicana Field in St. Petersburg, Florida. The Brewers beat the Tampa Bay Rays 10-1.
October 27, 2026

Brewers Economy Heats Up With Milwaukee One Win Away From Title

Ticket resale prices are surging in anticipation of the club’s first title.
October 25, 2026

Brewers Raking In Cash From World Series Run

Brewers fans have set several MLB merchandise sales records.