If you dont have a process and you bought some stuff awhile ago and you arent sure if you are holding for just emotional bias now or because you should Just ask yourself if you would rebuy the position today at its market value Now if not that doesnt necessarily mean you should sell it all It just makes you ask questions of ok why wouldnt I or why I would - it considers if thesis is in tact or not, if sizing is correct, whats changed etc Sometimes you may still hold anyway because you bought early and now have a buffer to let it play out etc It helps for both positions you are down alot on and positions you are up alot on - as it separates the sunk cost fallacy and price confirmation bias to your thinking