You’ve probably seen his name on a plaque or in a business journal, but honestly, Mark Mastrov is the guy who basically invented the way most of us work out today. If you've ever swiped a key tag at 2 a.m. to hit a treadmill, you can thank him. But the big question everyone is asking in 2026—especially after some massive industry shifts—is just how much is he actually worth?
Right now, Mark Mastrov net worth is estimated to be sitting comfortably at approximately $400 million, though some industry insiders argue that with his recent re-acquisition of 24 Hour Fitness, that number is poised for a significant jump.
He isn't just a "fitness guy." He’s a shark. Mastrov didn't just build a gym; he built a blueprint for global fitness empires. From the early days in San Leandro to the boardroom of the Sacramento Kings, his financial journey is a masterclass in knowing when to sell and, more importantly, when to buy back in.
The $1.6 Billion Payday That Started It All
To understand the Mark Mastrov net worth story, you have to go back to 2005. This was the "Big One." Mastrov sold 24 Hour Fitness to Forstmann Little & Co. for a staggering $1.6 billion.
Think about that.
He started with one single club in 1983. He wasn't some trust fund kid; he was a guy who saw that people wanted to work out on their own schedule. By the time he cashed out, he had built a network of over 400 clubs. That exit alone cemented his status as a centimillionaire.
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Most people would have retired to a beach in Cabo. Not Mark. He took that capital and started New Evolution Ventures (NeV). This wasn't just another gym company. It was an incubator. He partnered with celebrities like Alex Rodriguez and Madonna (though the Hard Candy Fitness venture with Madonna eventually wound down) to create high-end, brand-heavy fitness experiences.
The Kings, the Crunch, and the Comeback
If you follow the NBA, you know Mastrov’s face from the sidelines. In 2013, he was a key part of the group led by Vivek Ranadivé that bought the Sacramento Kings for a then-record $535 million.
Owning a piece of a professional sports team is a classic "wealth multiplier." While he eventually sold a portion of his minority stake to Ranadivé and Arctos Sports Partners in a 2021 restructuring, the appreciation of NBA franchises during that decade added a massive cushion to his personal balance sheet.
Then came Crunch Fitness.
Mastrov and his partner Jim Rowley bought Crunch when it was basically in the gutter. They turned it into a franchising powerhouse. By the time Leonard Green & Partners took a majority stake in 2025, Crunch had exploded to over 550 locations.
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But here is the twist nobody saw coming: He's back at 24 Hour Fitness.
In January 2026, Mastrov partnered with LongRange Capital to re-acquire the very company he founded. It’s a full-circle moment. The company had struggled through a 2020 bankruptcy and a messy pandemic recovery. Mastrov is betting that he can "Steve Jobs" the situation—returning to his original creation to save it.
Breaking Down the $400 Million Figure
People get weird about net worth numbers. They see "$1 billion" in a headline and think it's all cash in a bank account. It’s not. Most of the Mark Mastrov net worth is tied up in:
- Equity in 24 Hour Fitness: His new ownership stake via the 2026 acquisition.
- Real Estate Holdings: Including his famous Lake Tahoe estate, which was listed for $35 million and eventually moved for around $27.5 million.
- New Evolution Ventures (NeV): His private equity and investment vehicle that still holds various fitness and tech interests.
- Angel Investments: He’s been quietly pouring money into HealthTech startups like Sarva (an Indian yoga platform) and Aviron.
Is he a billionaire? Not quite yet, though some lists in late 2025 tried to claim it. Most reliable financial trackers put him in that $400M to $500M range. Honestly, in the world of private equity, "worth" is a moving target based on the most recent valuation of his companies.
What Most People Get Wrong About His Success
Success in the fitness world is notoriously fickle. For every 24 Hour Fitness, there are a thousand local gyms that go bust in six months.
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Mastrov’s "secret sauce" wasn't just the 24-hour model. It was the subscription economy before it was a buzzword. He understood that if you make the gym a utility—like water or power—people will keep paying the monthly fee even if they don't go.
He also wasn't afraid to fail. Not every brand he touched turned to gold. Remember Hard Candy Fitness? It didn't exactly take over the world. But he has this uncanny ability to pivot. When the "big box" gym model started to feel stale, he moved into the "High-Value, Low-Price" (HVLP) space with Crunch.
Why Mark Mastrov Still Matters in 2026
The fitness industry is currently obsessed with AI trainers and "smart" home gyms. Mastrov is doubling down on the "third space." He believes people still want to leave their houses and sweat around other humans.
His return to 24 Hour Fitness as Executive Chair is more than just a nostalgia trip. He’s already rolling out Recovery24—dedicated zones for cold plunges, saunas, and red-light therapy. He’s shifting the brand from "where you go to lift weights" to "where you go to live longer."
If he successfully turns 24 Hour Fitness back into the industry leader, that $400 million net worth could easily double by the end of the decade.
Actionable Insights from Mastrov’s Playbook:
- Look for the "Third Space": Whether it's a gym or a coffee shop, people still crave physical community. If you're looking to invest, look for businesses that provide what a screen cannot.
- The "Buy-Sell-Buy" Strategy: Sometimes the best investment is the one you already know inside out. Mastrov’s return to his original company shows that intimate industry knowledge is often more valuable than "new" opportunities.
- Diversify into Lifestyle Tech: Mastrov didn't just stay in brick-and-mortar; he’s heavily invested in HealthTech. Don't let your primary business make you blind to the tech that might eventually replace it.
- Brand is Everything: From partnering with Shaq to the UFC, Mastrov understands that a gym is just a room full of metal until you put a brand name on the door that people actually care about.
The takeaway? Don't bet against the guy who changed how the world works out. He’s done it three times already, and with 24 Hour Fitness back in his hands, he's probably just getting started.