As a value investor , when do you sell?

Hi, I slightly disagree with you. I don’t think that you should exit at 30% profit, because when you do that, you will miss out on potential multi-baggers. And the opportunity costs (i.e. other stocks which you would rather invest your money in, after exiting the former, has no guarantee of bringing you more money, in fact you can even lose money).
I read somewhere where a very good value investor said that, every day that you are holding a stock, you are effectively making a buy call – because you are not selling it. Let’s say you bought something at Rs. 100 and it goes to Rs. 150, if you are still holding that stock, then you are effectively making a buy call at Rs. 150. And you should definitely do this if the fundamentals still look bright, and the valuation is still reasonable at Rs. 150. Just a stock doubling or going even 5x is no reason to sell, because every 100x stock will go through periods of 2x 3x 5x

Warren Buffett, and even many other value investors have explicitly laid out their reasons for “when to sell a stock” . Warren Buffett has mentioned two main reasons:

1. When he sees a more attractive opportunity (the opportunity cost that we discussed above)
2. When the fundamentals or the economics of the basis changes (lets say the company has started taking a lot of debt for capex, or decreasing free cash flows, decreasing profit margins, etc.)

Dr. Vijay Malik, who is a reputed investor has also written a very nice article about this in detail on his website: https://www.drvijaymalik.com/when-to-sell-stock/?highlight=”when%20to%20sell”

Thanks!
I would love to hear other thoughts on this and counter opinions.