At last report, Norwegian Cruise Line Holdings (NYSE: NCLH) was the only major publicly traded cruise line stock in the U.S. to require that "all guests and crew must be fully vaccinated [against COVID-19] at least 2 weeks prior to departure, in order to board." (Once the company is able to cruise at all, that is).
Cruise rival Carnival Corporation (NYSE: CCL) , meanwhile, is reportedly still considering the issue -- but apparently leaning away from requiring vaccinations.
And Royal Caribbean (NYSE: RCL) ?
For further details see:
Royal Caribbean May Require Vaccination for Passengers as Young as 12