Offer your thoughts or opinion on the input financial query or topic using your financial background.

How do I manage my portfolio as stock evaluation criteria evolve?
Don't sell. Ever.  Well almost. A number of studies have shown that buying equal amounts of shares randomly will beat the market long term, and certainly won't do badly.  Starting from this premise then perhaps you can add a tiny bit extra with your skill... maybe, but who knows, you might suck.  Point is when buying you have the wind behind you - a monkey would make money. Selling is a different matter. You have the cost of trading out and back in to something else, only to have changed from one monkey portfolio to the other. If you have skill that covers this cost then yes you should do this - but how confident are you? A few studies have been done on anonymised retail broker accounts and they show the same story.  Retail investors on average lose money on their switches. Even if you believe you have a real edge on the market,  you're strategy still should not just say sell when it drops out of your criteria.  Your criteria are positive indicators. Lack of positive is not a negative indicator.  Sell when you would happily go short the stock.   That is you are really confident it is going down. Otherwise leave it.