Shein offered no details about the nature of the FTC's inquiry, and the filing appears to mark the probe's first public disclosure. "We are actively cooperating with the FTC … Although it is possible that we may reach a settlement with the FTC in connection with the investigation, we currently cannot predict the probable outcome of the investigation and the timing of such outcome, and we cannot rule out that such outcome could occur in the near term," the company said in the filing. An FTC spokesperson offered no comment, and Shein left a CNBC inquiry for additional details unanswered.