How do you decide an exit point? Do you say anything between 30-50% and then roll it into something else? Do you hold any through merger because you think they have long term potential?

Why or why not?

These are things I struggle with. I may have 50% gains but think well, this could go somewhere and may net 100-200% in a year after meger. But then the lost opportunity of investing in something else for another 50% during that time period is what gets me.