Planet Fitness Inc.'s stock fell Thursday in a disappointing trading debut.

Shares of the budget fitness chain, which is known for its $10 monthly memberships, opened at $14.50, 9.4% below their IPO price. Late Wednesday the IPO was priced at $16 a share, at the high end of expectations.

The deal raised $216 million by selling 13.5 million shares. That total doesn't count a so-called overallotment option, which gives underwriters the opportunity to sell additional shares in certain circumstances.

Planet Fitness and certain selling stockholders had planned to sell shares at $14 to $16 apiece, according to regulatory filings.

Planet Fitness's stock decline comes the day after several poor trading starts. Amplify Snack Brands Inc. and Sunrun Inc. tumbled in their first session of trading on Wednesday. Amplify's 10% fall marked a rare setback for a high-profile IPO that had been priced above its range and likely signaled a warning to big-name consumer brands preparing to go public. Momentum investors piled into the Amplify deal, which was more than 20 times subscribed, looking for a big first-day pop. When there was none they bailed, a person familiar with the matter said, taking the price of the stock down.

The fall in shares of Amplify and Planet Fitness follow a string of strong first-day performances by consumer-brand companies. Last month, Blue Buffalo Pet Products Inc. shares jumped 36% in their first day of trading. Fitbit Inc., another buzzed-about consumer company that made its debut earlier this year, popped 48% after being priced above expectations.

Planet Fitness, which is majority owned by private-equity firm TSG Consumer partners, began trading on the New York Stock Exchange Thursday under the symbol "PLNT." The deal was led by J.P. Morgan, Bank of America Merrill Lynch, Jefferies and Credit Suisse.

Write to Corrie Driebusch at corrie.driebusch@wsj.com

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