Pomerantz LLP said a class action lawsuit has been filed against Planet Fitness, Inc. over whether the company and certain of its officers and directors engaged in securities fraud or other unlawful business practices. The case covers investors who purchased or otherwise acquired Planet Fitness securities during the class period, and investors have until September 14, 2026, to ask the court to appoint them as lead plaintiff (the investor who represents the class). The filing follows Planet Fitness’s May 7, 2026 first-quarter 2026 results, when the company said 2026 had started more slowly than expected from a net member growth perspective because of internal and external headwinds during its peak sign-up period. It also paused a planned national Black Card price increase pending a broader pricing review and cut several 2026 targets, including system-wide same club sales growth to about 1% from 4% to 5%, revenue growth to about 7% from about 9%, adjusted EBITDA (earnings before interest, taxes, depreciation, and amortization) growth to about 6% from about 10%, adjusted net income to a roughly 2% decline from prior guidance of 4% to 5% growth, and adjusted diluted EPS (earnings per share) growth to about 4% from 9% to 10%. Planet Fitness shares fell $19.95, or 31.19%, to close at $44.01 on May 7, 2026.