I don’t know any endeavour where the difference between how easy something looks & how difficult it actually is, is as wide as in Investing (in the context of stock picking).
People across the income/wealth spectrum feel it is easy to pick stocks & multiply their savings. They fall for every racket out there - High Risk-High Return/Small Caps Outperform/Divinations by Drawing Lines/Tips from TV Experts/Option Seminars/Leverage….
1/ The key to knowing when to sell is knowing ‘why you bought it in the first place'.
— Peter Lynch
Either the story has played out or the thesis has been violated or you have found something better.
Let’s examine the case where the stock is performing first.
2/ When you sell depends on what kind of investor you are.
The traits that makes you seek high margin of safety & deep value in your buy decisions will often make you sell early. Those decisions are driven by similar mindsets.
(for the justifiably endangered retail active investor)
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1/ To have 10 stocks in your portfolio you probably have to track a 100 companies. These include competitiors of your holdings and potential inclusions.
Every company is telling a story not just about itself, but also about its peers, its customers, its vendors - the economy.
2/ Quaterly results are where you start. Maintain a sheet for each sector with important parameters (value drivers) for each stock and update it quarterly. Some website (@Tijori1)track some of this data, but maintain your own sheet. (“Quarterly Data Sheet”).
(for the stubborn, amateur, active investor, who should rather be indexing)
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Don’t buy anything that you are not comfortable buying at least 5% of your portfolio.
This is not a return maximisation hack, it’s a risk mitigation one.
You will have higher thresholds for inclusions if you force yourself to buy at least 5%. You will be more selective.
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Have at least 10 & not more than 20 stocks in the portfolio (if your portfolio is >>> annual income).
There just aren’t enough clean companies available in India at good valuations that you understand. I struggle to get to even 10 & I have being doing this for a while now.
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