Here is the VISUAL everybody should always keep in mind. I remind myself every time i think about "knee jerk" trading. You know I'm longer-term oriented BUT in certain cases i'm trying to get to long term cap gains on positions like SE, within a taxable account, which occurs in April for me and I might sell 1/2 to reallocate elsewhere. A 355% return in less than a year requires some thought on what to do.
Most people make the BIG mistake thinking that SE, PINS, TTD etc. can't and won't go much higher just because it's already run up and valuations are high. Follow Motley Fool and get away from that line of thinking. Expensive stocks just get more expensive. Good ones do. You pay UP for growth. This is why we have to watch INTEREST RATES!!!
When i do make that move i always have to ask myself, if i'm gonna sell a huge winner that i'm riding around the race track like Secretariat, and passing up other horses as we go..........Is it wise to jump off that horse and onto some beaten down Nag? Lol.
Point is, as long i'm hopping onto Seattle Slew, Affirmed or Citation I'm good!