@hvqo A common mistake is to sell or reduce your winning positions. Why didn't you let the position run and simply build up others going forward to reduce its weighting?
@MrKurt89 Selling off is a mistake. And it’s a typical (psychological) one. Many people tend to sell or reduce their holdings in stocks that are performing well and hold onto stocks that are down (precisely because they’re down). Anyone who doesn’t understand this will face ongoing problems and underperform the market significantly.
@Ayecaramba256 But why should I hold onto a position that makes up two-thirds of my portfolio and is also up 230 percent when I can use the proceeds to achieve broader diversification? Besides, I still hold a large portion of Allianz.