Planet Fitness, Inc. Securities Class Action Lawsuit Update | Planet Fitness, Inc.

• Company: Planet Fitness, Inc. (NYSE: PLNT)
• Lead Plaintiff Deadline: September 14, 2026
• Class Period: November 6, 2025 - May 6, 2026
• Stock Drop: May 7, 2026 - PLNT fell $19.95 (31.19%) to $44.01
• Lawsuit Type: Securities Class Action

Introduction

A securities class action was filed on July 14, 2026 in the United States District Court for the District of New Hampshire against Planet Fitness, Inc., Chief Executive Officer and Director Colleen Keating, and Jay Stasz, who served as Chief Financial Officer during the relevant period. The lawsuit is brought on behalf of investors who purchased or otherwise acquired Planet Fitness common stock between November 6, 2025 and May 6, 2026, inclusive.

The complaint centers on a sharp contrast. Planet Fitness allegedly told investors that its brand was healthy, its "We Are All Strong on This Planet" marketing campaign was resonating, its Black Card pricing plan was supported by testing, and its high-value, low-price subscription model could support ambitious 2026 and three-year growth targets. Investors were asked to believe in a durable engine: more members, more rate, more scale.

According to the lawsuit, the engine was sputtering where it mattered most. The complaint alleges that Planet Fitness' updated marketing was not connecting with the company's core beginner and casual gym-goer audience and was instead intimidating the very consumers the brand historically targeted. During the crucial first-quarter sign-up season, the alleged weakness in net joins made the company's fiscal 2026 guidance and three-year growth algorithm unattainable.

The break came on May 7, 2026. Planet Fitness cut full-year guidance, reduced same-store sales growth expectations, paused the planned Black Card price increase, and withdrew the long-term algorithm it had introduced only months earlier. The market reaction was swift: PLNT fell about 31% in one trading day.

Backdrop and Business Context

Planet Fitness traces its roots to 1992 in Dover, New Hampshire, where brothers Michael and Marc Grondahl acquired a struggling Gold's Gym franchise and eventually reshaped it into a low-cost gym concept for people who did not identify with traditional fitness culture. The company later acquired the Planet Fitness name from Rick Berks and built its identity around affordability, simplicity, and a non-intimidating club experience. Planet Fitness went public on August 6, 2015, pricing 13.5 million Class A shares at $16.00 per share on the New York Stock Exchange and raising about $216 million in gross proceeds from the base offering.

Today, Planet Fitness is a franchisor and operator of fitness centers built around a high-volume, low-price model. It reports through three principal segments: franchise operations, corporate-owned clubs, and equipment sales to franchisees. The company earns revenue from membership fees at company-operated clubs, royalties and fees from franchisees, and equipment sales tied to new clubs and reequipment cycles. As of December 31, 2025, Planet Fitness reported approximately 20.8 million members, 2,896 clubs, and $1.3 billion in fiscal 2025 revenue. Planet Fitness competes with other health and fitness clubs, boutique studios, digital and at-home fitness offerings, and other providers of exercise and wellness services.

The company's model depends heavily on broad consumer appeal. Its brand promise historically focused on beginners, casual exercisers, and value-conscious members who wanted access without intimidation. That dependency sits at the center of this Planet Fitness securities lawsuit: according to the complaint, the company allegedly leaned too far into marketing that appealed to more fitness-minded consumers while weakening its resonance with the beginner demographic that powered its membership growth.

Promises Made vs. Reality

Planet Fitness opened the Class Period with confidence. On November 6, 2025, the company announced third-quarter fiscal 2025 results, and Keating highlighted "significant progress in executing our long-term strategy" while praising management's "strategic decisions" to position Planet Fitness for long-term growth. On the same earnings call, she said the company had continued the "we are all strong on this planet" marketing campaign, which she said highlighted "best-in-class equipment," a "welcoming atmosphere," and a supportive community. She further told investors that the "strong join trend" had continued and that Black Card penetration reached 66.1% of total membership.

According to the complaint, the planned Black Card price increase was repeatedly tied to Planet Fitness' expected sales growth and long-term growth algorithm. Keating said Planet Fitness had made the decision to raise the Black Card price to $29.99 after its peak join season in 2026, following "thoughtful consideration, significant testing and data analysis." Stasz reinforced the message, explaining that testing showed the price increase had been accretive to average unit volume and that the company expected the Black Card price increase to be accretive to AUV, while acknowledging that acquisition rates could decrease for a period before rebounding.

One week later, at the company's November 13, 2025 Investor Day, Planet Fitness presented a long-term growth outlook for fiscal years 2026 through 2028. The company projected low-double-digit revenue compound annual growth, mid-single-digit system-wide same club sales growth, new club unit growth in the 6% to 7% range, mid-teens adjusted EBITDA compound annual growth, and mid-to-high-teens adjusted diluted EPS compound annual growth. Keating tied that outlook to marketing, saying the company's messaging "has performed quite well and has legs to extend into 2026," adding that the message was "resonating" and "driving joins." Stasz then described a three-year growth algorithm in which same club sales would be driven approximately 75% by rate and 25% by volume, reflecting the Classic Card price increase and planned 2026 Black Card price increase.

The assurance continued into 2026. At the ICR Conference on January 13, 2026, Stasz said Planet Fitness was in a "good position" as consumers chose to spend discretionary dollars on fitness and health. He pointed to record Black Card penetration as a metric suggesting the company had the ability to take price and said Planet Fitness did not need new Black Card spa amenities before rolling out the $29.99 price point. On February 24, 2026, the company issued fiscal 2026 guidance, including system-wide same club sales growth in the 4% to 5% range, revenue growth of approximately 9%, adjusted EBITDA growth of approximately 10%, and adjusted diluted EPS growth of 9% to 10%.

The complaint alleges that, even as Planet Fitness discussed weather and attrition headwinds, defendants minimized risks tied to seasonality and weather impacts on the company's ability to meet its guidance. Stasz described weather impacts and a slightly higher cancellation rate as "short-term transitory items," while stating that the company had seen "strong join demand" and that recent attrition trends were returning in line with expectations. The company also reiterated its three-year growth algorithm and, after Stasz abruptly departed as CFO on March 9, 2026, reaffirmed its 2026 financial guidance in a Form 8-K and accompanying press release.

The alleged reality was different. On May 7, 2026, Planet Fitness disclosed that 2026 was "off to a slower than expected start from a net member growth perspective," that the company was "sharpening" marketing to prioritize demand and member growth, and that it was pausing the planned national Black Card price increase. Keating later explained that the company's marketing had resonated more with a fitness-minded consumer but had less resonance with the beginner or casual gym-goer, Planet Fitness' traditional sweet spot. She also said the company "may have pivoted too far." As alleged in the complaint, Planet Fitness and its executives painted a picture of marketing resonance, pricing readiness, and achievable growth while allegedly concealing that the company's core customer acquisition strategy was faltering and that its guidance depended on assumptions that had become unsustainable.

Timeline of Alleged Misconduct and Disclosures

Class Period: November 6, 2025 - May 6, 2026, inclusive.

• November 6, 2025: Class Period begins. Planet Fitness issued third-quarter fiscal 2025 results. Keating highlighted "significant progress" in the company's long-term strategy, discussed the "We Are All Strong on This Planet" campaign, said join trends remained strong, and announced plans to raise the Black Card price to $29.99 after the 2026 peak join season. Stasz addressed the Black Card pricing decision during the earnings call, stating that Planet Fitness had tested and analyzed the increase and expected it to be accretive to average unit volume.
• November 13, 2025: Planet Fitness held its 2025 Investor Day and issued long-term fiscal 2026 through 2028 targets, including low-double-digit revenue compound annual growth and mid-single-digit system-wide same club sales growth. Keating told investors that the company's marketing messaging had performed well, had "legs to extend into 2026," was "resonating," and was "driving joins." Stasz described the company's three-year growth algorithm and said same club sales growth was expected to come approximately 75% from rate and 25% from volume, reflecting the Classic Card price increase and planned Black Card price increase.
• January 13, 2026: Planet Fitness presented at the ICR Conference 2026. Stasz stated that the company was in a good position to take price, cited record Black Card penetration, and said Planet Fitness did not need new Black Card spa amenities to roll out the Black Card price increase.
• February 24, 2026: Planet Fitness announced fourth-quarter and full-year fiscal 2025 results and issued 2026 guidance, including system-wide same club sales growth of 4% to 5%, revenue growth of approximately 9%, adjusted EBITDA growth of approximately 10%, and adjusted diluted EPS growth of 9% to 10%. Keating praised the company's ongoing marketing campaign, stating that because the campaign resonated strongly in 2025, Planet Fitness extended it into 2026. Stasz described weather and attrition issues as short-term transitory items, stated that Planet Fitness had seen strong join demand, and reiterated the three-year growth algorithm.
• March 9, 2026: Planet Fitness filed a Form 8-K announcing Stasz's sudden departure as Chief Financial Officer, effective the same day. The filing stated that his departure was not the result of a dispute or disagreement with the company relating to reported financial statements and related financial results. Planet Fitness announced that former CFO Tom Fitzgerald would serve as interim CFO and reaffirmed its 2026 financial guidance previously announced on February 24, 2026.
• May 6, 2026: Class Period ends. Planet Fitness common stock closed at $63.96 per share.
• May 7, 2026: Alleged Corrective Disclosure and Market Reaction. Planet Fitness announced first-quarter fiscal 2026 results, cut full-year 2026 guidance, lowered same club sales growth expectations to approximately 1% from 4% to 5%, paused the planned national Black Card price increase, and withdrew the three-year growth algorithm. Keating stated that the company's marketing resonated more with fitness-minded consumers and less with beginner or casual gym-goers, and acknowledged that Planet Fitness "may have pivoted too far." PLNT fell from $63.96 per share to $44.01 per share, a decline of about 31.19% in one day.

Investor Harm and Market Reaction

The alleged corrective disclosure arrived on May 7, 2026, when Planet Fitness announced first-quarter fiscal 2026 results and sharply reset investor expectations. The company lowered system-wide same club sales growth guidance to approximately 1% from the prior 4% to 5% range, reduced revenue growth guidance to approximately 7% from approximately 9%, cut adjusted EBITDA growth guidance to approximately 6% from approximately 10%, and withdrew the three-year growth algorithm. PLNT fell $19.95 per share, or about 31.19%, from a May 6, 2026 closing price of $63.96 to a May 7, 2026 closing price of $44.01.

The complaint links that drop to disclosures about the same issues that had allegedly been understated during the Class Period: weaker net member growth, a marketing campaign that did not resonate with core beginners and casual gym-goers, and the decision to pause the national Black Card price increase. Planet Fitness also disclosed that the Black Card pause accounted for approximately 150 basis points of the reduction in same club sales guidance, while the remainder reflected softer net member growth trends.

Analysts reacted by cutting price targets and focusing on the same themes. Wells Fargo reportedly noted that the "real surprise" was the meaningful 2026 guidance reduction after the company had reiterated guidance on March 9, 2026. RBC cited net add headwinds, marketing that did not appear to resonate, the Black Card pricing pause, and withdrawal of the three-year outlook. William Blair described a meaningful miss in marketing messaging and said the attempt to attract more existing fitness club users while maintaining appeal to first-time gym-goers had backfired by intimidating the company's core market.

Litigation & Procedural Posture

The complaint asserts claims under Section 10(b) of the Securities Exchange Act of 1934 and Rule 10b-5 against all defendants, and claims under Section 20(a) of the Exchange Act against the individual defendants as alleged controlling persons of Planet Fitness.

The named defendants are Planet Fitness, Inc., Colleen Keating (Chief Executive Officer and Director), and Jay Stasz (Chief Financial Officer at all relevant times).

Scienter allegations center on the individual defendants' alleged access to non-public information about customer response to marketing campaigns, Black Card pricing tests and analysis, membership growth trends, and the bases for fiscal 2026 and three-year financial targets. The complaint also points to the March 9, 2026 reaffirmation of 2026 guidance, Stasz's abrupt departure as CFO, and later acknowledgments that late-2025 and early-2026 data showed the marketing was skewing toward more fitness-minded consumers. No insider sales are alleged, and no confidential witnesses are cited in the complaint.

Procedurally, the case is at the complaint-filing stage and seeks class treatment on behalf of investors who purchased or otherwise acquired Planet Fitness common stock during the Class Period and were damaged upon the alleged corrective disclosure. Defendants would typically be expected to respond to the complaint through motions or other pleadings before any class certification ruling. Lead plaintiff submissions are due September 14, 2026.

How to Check Whether You May Be Eligible for the Planet Fitness, Inc. (PLNT) Class Action

• Confirm you purchased PLNT common stock during the November 6, 2025 to May 6, 2026 class period
• Review the allegations and eligibility requirements in the pending securities class action
• Gather trade confirmations and brokerage records documenting purchases or losses
• Consult counsel regarding the lead plaintiff deadline, eligibility, and any potential rights in the litigation

Disclaimer: Attorney Advertising. This shareholder alert is for informational purposes only and does not constitute legal advice. Consult a qualified attorney for personalized guidance. No specific outcomes are guaranteed.