Unfortunately, I wasn't consistent enough, which meant that I didn't take some profits in time.

For new purchases, however, I now consistently set an S/L at -15%. If it doesn't work out with the new share, you have to realize it at some point.

On the other hand, I never know where to set the S/L for stocks that have done well. For example, I am up 60% in 2 months with Kawasaki thanks to @Tenbagger2024. Where should I set the S/L so that something like SAP (from + 130% to now + 65%) doesn't happen to me again, but I also let the winners run a bit. Really difficult.
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@IronEagle One solution would be to always adjust the SL to -15% of the high. But I also find it difficult to always be consistent. With shares like Allianz or Microsoft, Realty Income, I would actually say that I won't sell them anyway. But then I want to be smarter than the market when they break through the SL. But being consistent can also go wrong. I once bought Palantir at 14 and then sold it at 7 or 8. And after that it only went north. But that's the game. Sometimes you lose, sometimes the others win.
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@savvy_investor_2852 I agree that I will probably never sell $ALV $BRK.B and $MSFT (old stock from 2000 🤣🙈), for example - although things can go badly for a long time. 15% as S/L should absorb short-term market fluctuations.

With stocks like $IREN you probably have to keep pulling the S/L, although I am gradually throwing these extremely volatile stocks out of the portfolio - they cost me too many nerves 😃
@IronEagle Before I buy a stock, I already think about what my maximum is for which I am buying (of course I adjust when new figures come in).

Selling is when the price is 20%+ above what I would spend.

Do I lose future gains as a result? Certainly - but less often.
Actually, you only lose book value that never existed when a craze drives the price up.

When a good opportunity presents itself and I don't have the cash to take advantage of it, I go through my portfolio and see if I have any stocks that I can sell.

If you never want to sell, it's better to stay away from individual stocks (or limit yourself to "forever companies".

In addition to my 3 ETF categories (World, EM, SmallCaps), my aim is to hold a maximum of 10 individual stocks (I currently hold 7).
If you are not prepared to liquidate a position, why not invest in an existing one?

to be fair: I don't stick to the last point consistently either.

I never set a stop loss when buying.
I would have booked a clean loss at SOFI with -40% intermittently before I sold with almost +100% (was still below my sales price but I needed cash...).
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