$NIO Inc.(NIO)$ when I was few years younger, I made that mistake. I sold a stock of a company with great fundamentals because of few negative stock days , just to see it sky rocketing 1000% afterwords. NIO is growing in a 'tempo', which is faster than the rythm TESLA$Tesla Motors(TSLA)$ ever grown. today's 30, is tomorrow's 300. what important is measure of sales and the gling comes with it. short sellers will be short sellers, there is a room for a hyenas in the world as well;) But serious people need to have composure, when they are invested in a successful company, with an amazing future.