In How Many Stocks Should You Actually Own?, we covered how to build a portfolio of individual stocks. Now comes the question that experienced investors often say is harder than buying — when should you sell?
Selling is one of the most personal decisions in investing. Talk to ten experienced investors and you will get ten different answers, all of them defensible. There is no universal right rule. The important thing is to set your rules and stick to them. Remove emotions from the decision.
But there are well-established frameworks used by some of the most respected investors and analysts in the world. This post walks through them so you can decide what fits your situation. Or you can create your own.
One important note before we begin. I am not a licensed financial advisor. This post presents widely accepted frameworks from well-known investors and financial experts so you can think through what works for you. Always do your own research and consider speaking with a licensed professional for advice specific to your situation.
Why Selling Is Harder Than Buying
When you buy a stock, you are full of hope. You have done your research and you believe in the company.
Selling is different. Selling involves regret, second-guessing, and emotion. If the stock has gone up, you wonder if you are leaving money on the table. If the stock has gone down, you wonder if you are giving up just before a rebound. Either way, you are forced to confront the possibility that you might be wrong.
This is why having rules matters. Without rules, emotion takes over — and emotion is the worst thing you can bring to a selling decision.
Know Why You Own It
Before you can decide when to sell, you have to be honest about what you own and why.
Most investors hold two different kinds of stocks, often without realizing it.
Conviction Holdings
These are long-term positions in businesses you believe in. You bought them after research. You expect to hold them for years — sometimes decades. A conviction holding gets the benefit of the doubt through tough quarters and rough patches. Jim Cramer, of CNBC, always refers to these stocks as ‘Own Them Don’t Trade Them’. Apple is a stock that falls into this category for many people. One look at the chart since 1980 will show you why. There are certainly dips within the chart but it has historically continued upward over the years.
Shorter-Term or Speculative Positions
These are stocks you bought for a specific reason — a catalyst, an opportunity, or simply a hunch. You did not buy them to hold forever. A speculative position should have tighter selling rules and less emotional attachment.
As we have discussed elsewhere, only a portion of your overall portfolio should be designated towards these types of stocks.
The rest of this post will feel different depending on which type of stock you are thinking about. A conviction holding can ride out volatility. A speculative position cannot.
Frameworks for When to Sell
Below are the most widely used selling frameworks among experienced investors and analysts. Each one has merit. Each one comes from a different school of thought. Most experienced investors use a combination of these, not just one.
1. Sell When Your Original Thesis Breaks
This is the framework most professional investors point to first. You sell when the reason you originally bought the stock no longer applies.
Maybe you bought a company because of its dominant market position — and a new competitor has taken it. Maybe you bought because of a specific product line — and the company has pivoted away from it. Maybe management changed direction in ways you do not agree with.
When the story that made you buy is no longer true, that is a serious reason to consider selling.
Boeing fell into this category for a lot of investors when they had their 737 Max issue as discussed at What Researching One Stock Actually Looks Like: A Walkthrough Using Johnson & Johnson. Wells Fargo is another example when they were found to have opened new accounts without customer consent.
2. Sell When Something Better Comes Along
This framework is associated with Charlie Munger, Warren Buffett’s longtime business partner. The idea is simple — you sell not because a stock is bad, but because you have found a better use for the money.
This is called opportunity cost. Every dollar you have invested in one stock is a dollar you cannot invest in another. If you find a clearly stronger opportunity, swapping makes sense.
This is harder than it sounds. “Better” is easy to imagine and hard to prove. Use this framework carefully.
3. Take Profits and Rebalance
When a stock you own has run up significantly, the position becomes a larger percentage of your portfolio. What was a 5 percent position might now be 15 or 20 percent. That is more concentration risk than most investors want.
Taking some profit off the table — selling a portion, not the whole position — is a way to lock in gains, reduce risk, and rebalance your portfolio. You can always buy back later if the thesis still holds. I discuss this at How Many Stocks Should You Actually Own? for my own portfolio.
A classic version of this rule is called “sell half of a double.” When a stock doubles in value, you sell half. Now you have recouped your original investment, and the remaining half is what some investors call “house money.” Psychologically, many investors find this easier even though the remaining investment is still fully at risk. The pressure is off and you can let it run.
4. Sell When Bad News Becomes a Pattern
This one is important enough that we will dig into it more deeply in the next section. The short version — one bad quarter is noise. A pattern of bad news that points to a real deterioration in the business is a serious sell signal.
5. Sell When Valuation Reaches Extremes
Some investors sell when a stock becomes wildly overvalued compared to its history and its peers. This is the value-investing approach, associated with experts like Benjamin Graham and Howard Marks.
Here is the honest caveat. This sounds simple but it is hard in practice. Great companies can stay “expensive” for years. Nvidia has looked overvalued on traditional measures multiple times during the AI boom, and yet the stock has continued to climb. Investors who sold on valuation alone left enormous gains on the table.
More experienced investors usually treat valuation as one input among several, not a standalone reason to sell.
6. Set a Stop-Loss
A stop-loss is a predetermined price at which you sell automatically. For example, you might decide to sell if the stock drops 15 or 20 percent below what you paid for it.
This approach is more common in active trading than in long-term investing. Famous advocates include William O’Neil, founder of Investor’s Business Daily.
The benefit is that stop-losses protect you from catastrophic losses. The downside is they can trigger sales during normal market dips that would have recovered. Use with care, and recognize this is more aggressive than buy-and-hold investing.
This is also an approach someone uses if they don’t have the time to constantly monitor a stock they own.
7. Set a Target Price
Some investors set a target price when they buy. If the stock reaches that price, they sell.
This is much harder than it sounds for new investors. Setting an accurate target requires real valuation skill that takes years to develop. If you are interested in this approach, start by writing down what you think the stock is worth and why — and then test your reasoning over time. For me, the hard part is also emotional, which is why you learn to stick to rules. If a stock has risen to your target, you will wonder what is left in the tank and what profits are you potentially leaving on the table.
Of all these frameworks, #4 is probably the most important for long-term investors so we will go into more detail now.
When Bad News Becomes a Pattern
This is the framework most beginner investors will face the soonest, so it deserves its own section.
Every public company has bad quarters. Sales miss. Costs go up. Customers shift. Weather happens. A single bad quarter is rarely a reason to sell.
What you are looking for is a pattern.
One Bad Quarter Is Noise. Three Is a Pattern.
If a company has three or more quarters with the same negative theme — margins shrinking, customers leaving for a specific competitor, management blaming the same issue repeatedly — that is not noise. That is the business deteriorating.
This is when your original thesis (framework #1 above) starts to break.
Specific Warning Signs to Watch
Beyond a pattern of poor results, certain specific events are red flags worth taking seriously:
- Drastic changes in leadership. If a CEO or CFO leaves unexpectedly — or if multiple senior executives leave in a short period — pay attention. New leadership often means a new strategy, which can break the reason you bought the stock. Change does not always spell doom. Tim Cook has done an amazing job at Apple even though there was enormous caution when he took over.
- SEC investigations or accounting issues. If a company is required to restate earnings, or if the Securities and Exchange Commission opens a formal investigation, treat this as one of the biggest red flags in investing. Companies like Enron, Wirecard, and Luckin Coffee are textbook examples of how badly this can end.
- Dividend cuts. When a company that has consistently paid a dividend cuts or eliminates it, that is the company telling you it is in trouble.
- Debt rising faster than revenue. A growing debt burden during a period of stagnant or declining sales is a serious warning sign.
- Heavy insider selling. When executives are selling large amounts of their own stock, it is worth asking why. Again, ask the question and find the answer. It is not always a sign to sell.
- The story keeps changing. If every earnings call introduces a new “big initiative” that will turn the company around — and the prior one has been quietly abandoned — that is not a strategy. That is desperation.
Any one of these alone might not justify selling. When you see several at once, the picture is usually clear.
Company-Specific News vs Market Panic
This is one of the most important distinctions in investing, and one of the easiest to get wrong.
There is a huge difference between bad news about your company and bad news about the world.
Company-specific bad news means something has genuinely changed about this business. Sales are declining. A key product failed. Customers are leaving for a competitor. The company itself is in trouble.
Market panic is different. The world has become scary — a war, a pandemic, a financial crisis, an inflation spike. Everything is dropping, including healthy companies whose underlying business has not changed.
The COVID-19 crash in March 2020 is the perfect example. Stocks dropped 30 to 40 percent in a matter of weeks. Many investors panicked and sold. Yet by the end of the same year, the S&P 500 was up over 16 percent. The companies were not actually broken. The world was scary, but the businesses recovered.
Selling because your specific company is deteriorating can be smart. Panic-selling during a market-wide drop is almost always a mistake. I talk about this more at Trying to Time the Market? Here’s Why That’s a Costly Mistake
What About Truly Bad News? The Chipotle and Boeing Question
Sometimes a great company gets hit with truly bad news. The Chipotle E. coli outbreak in 2015 and 2016. The Boeing 737 MAX grounding after two fatal crashes. The news is real. The damage is real. The stock falls hard.
When this happens, you actually have three valid choices — and none of them is universally right or wrong.
- Hold. If your long-term conviction in the company is intact, do nothing. Great businesses recover from setbacks. Chipotle eventually did. Boeing has had a long road but the underlying franchise remains.
- Buy more. If you think the market has overreacted, this is when buying opportunities can appear. We covered this in our post on researching stocks. This is also why it is smart to keep 10-15% of your portfolio in cash. It allows you to take advantage of opportunities.
- Sell. If you want to step aside, preserve capital, and reassess later, that is also a defensible choice. You can always buy back once the dust settles.
What matters most is that you do not freeze. Have a plan. Make a decision. Move forward.
The Counterpoint: Sometimes the Answer Is Never Sell
With all this talk about when to sell, it is worth pausing to acknowledge a different school of thought.
Some of the most successful investors in history almost never sell. Warren Buffett still holds Coca-Cola and American Express positions he bought decades ago. Letting great companies compound for 20 or 30 years has historically been one of the most powerful ways to build wealth.
There are two strong reasons to consider this approach.
First, the math of compounding rewards patience. The longer you hold a great company, the larger the gains become — and trading in and out tends to interrupt that compounding.
Second, selling has real tax costs. Every time you sell a winner, you owe capital gains taxes. Holding for the long term postpones — and sometimes eliminates — that tax bill.
The point is not that you should never sell. The point is that constantly trading and tinkering is often worse than doing nothing. Patience is genuinely a strategy for the biggest and best companies. Johnson & Johnson is one of those companies for me. I will review news but never think of selling. Here is their chart since 1979:
A Word About Speculative Bets
If part of your portfolio is in speculative positions — those flyers we mentioned earlier — the selling rules are different and tighter.
First, some guardrails on speculative positions themselves.
- Only after you have built a real foundation of ETFs, index funds, and conviction holdings.
- Only with money you can afford to lose entirely.
- A small percentage of your total portfolio — typically 5 percent or less.
If you are going to take a flyer on a speculative stock, follow these rules for when to sell:
- Set your selling rules before you buy, not after.
- Use tighter stop-losses than you would on conviction holdings.
- Be willing to take a loss quickly when the bet does not work — speculation requires discipline.
- Do not let a losing speculative position grow into a larger portion of your portfolio by adding more money to it. That is called “averaging down on a losing bet” and it is how small mistakes become big ones.
The most important rule for speculative positions is to keep them small. The thrill of being right is never worth the damage of being wrong on a position that was too large.
A Quick Note on Taxes
Taxes are part of every selling decision, and a few rules are worth knowing.
Stocks held for more than one year are taxed at long-term capital gains rates, which are typically lower than the rates on stocks held for less than a year. This is one reason many investors prefer to hold winners for at least 12 months when they can.
Some investors also use a strategy called tax-loss harvesting — selling a losing position to offset gains elsewhere in the portfolio. This can reduce your tax bill.
If you do this, you need to know about the wash-sale rule. This is the part most people learn the hard way. If you sell a stock at a loss and buy the same stock — or one the IRS considers “substantially identical” — within 30 days before or after the sale, the IRS disallows the loss for tax purposes. The 30-day window applies in both directions, which surprises many investors.
If you are planning to harvest tax losses, talk to a tax professional first. The rules are easy to get wrong.
The One Rule That Matters Most
Of all the frameworks in this post, the most important one is this — whatever rules you set for yourself, follow them.
The biggest investing losses do not come from people who picked the wrong rules. They come from people who had rules and abandoned them when emotion took over.
Write your selling rules down. Review them when you are calm. Then trust your past self to make better decisions than your panicked self.
If your rules need to change, change them deliberately — not in the middle of a bad market day.
Conclusion
Selling is hard. There is no universal right or wrong answer, and the same situation can call for different responses depending on your conviction, your time horizon, and your goals.
What you can do is pick the frameworks that fit how you want to invest, write them down, and follow them. Your rules will evolve as you grow as an investor. That is normal and healthy. They will also change as you grow older. Someone in retirement will likely have stricter rules for selling than someone much younger with time on their side to cover mistakes.
The investors who do well over time are not the ones who sell at exactly the right moment every time. They are the ones who have rules, follow them, and stay patient.
You will not sell perfectly every time. Nobody does.
What matters is developing a process you trust and following it consistently over decades.
As always:
Start investing. Stay consistent. Give your money time to grow.
Cheers!
