Planet Fitness shares tumbled roughly 30% on Thursday, erasing billions in market value after management issued a sharp downward revision to its annual guidance and scrapped previously announced price hikes. The move caught many investors off guard, triggering the single largest single-day selloff in the company's history.

The decision to cancel planned price increases suggests that management is bracing for weaker consumer demand, particularly among its core base of budget-conscious members. The lowered outlook also raises questions about membership retention and future growth, especially as competition from boutique fitness brands and at-home workout platforms intensifies.

The broader fitness and leisure sector felt the shockwaves, with related stocks such as Xponential Fitness and Life Time Group also declining in sympathy. The S&P 500 consumer discretionary index slipped modestly, though the damage was concentrated in Planet Fitness and its closest peers.

No analyst commentary was immediately available following the announcement, but several sell-side firms are expected to cut their price targets in the coming days. The company's next earnings call will be closely watched for clarity on membership trends and any potential recovery path. Some long-term holders may view the steep decline as an overreaction, but the abrupt nature of the guidance cut leaves little near-term visibility.