When Do You Sell a Stock?

Deciding when to sell a stock is often harder than deciding when to buy one, because selling forces you to admit whether your original reasoning was right or wrong. Having a clear framework in place before you buy makes that decision far less emotional when the moment actually arrives.

What are good reasons to sell?

The most straightforward one is that the original reason you bought no longer holds. If you invested because you believed in a company's growth, its competitive position, or its management, and one of those things has genuinely changed for the worse, that is a legitimate reason to reconsider. Another good reason is that you need the money for something else in your life, or that a position has grown so large it now makes your portfolio poorly diversified.

What are poor reasons to sell?

Selling purely because the price has gone down is one of the most common mistakes investors make. A falling price by itself tells you nothing about whether the underlying business has actually gotten worse. Selling because of short term market volatility, a single disappointing quarter, or because a stock has been in the news, is usually a reaction to noise rather than a considered decision.

Should you sell just because a stock has gone up a lot?

Not automatically. Some investors sell simply because a stock has risen significantly, out of a feeling that it has become due for a fall. But a rising price does not necessarily mean a stock is now overvalued, and a business that keeps growing can justify a higher price for a long time. It is worth asking whether the valuation still makes sense relative to the business, rather than selling based on the size of the gain alone.

Why does this matter?

Because without a plan, selling decisions tend to be driven by fear during downturns and by greed or overconfidence during rallies, which is exactly the opposite of what tends to work. Writing down, before you buy, what would actually change your mind about a stock gives you something concrete to check your decision against later, instead of relying on how you happen to feel in the moment.