This story is a great reason why not to rely soley on analyst opinions in your stock picking. This is not to say big bank analysts are intenionally misleading, however there are a host of other factors you need to consider when buying a stock besides whether an investment bank analyst says something is a 'buy' or 'sell.' Incidentelly you will almost never come across a stock with a sell rating..and if you do and own it, it's probably too late.
https://www.businessinsider.com/moviepass-investors-tell-horror-stories-of-shares-dropping-99-percent-down-100000-2018-8