The company's stock price, which traded at a monthly high of $66.92 on March 7, plummeted to a low of $56.91 on Wednesday morning.

The stock's decline followed Planet Fitness' refusal to overturn its decision to ban Patricia Silva, who said her membership was revoked for violating the rules against photographing other gym users.

Silva photographed a male using the women's locker room. She said that the man had been shaving his face and told her he was "queer."

Silva, in a video posted to Facebook, said there was "a little girl sitting in the corner. She could have been [12 years old] … in a towel kind of freaked out."