The head and shoulders is one of the best-known chart patterns. It shows three peaks: a higher peak in the middle, the head, flanked by two lower peaks, the shoulders. A line drawn under the two troughs between them is the neckline. Traders call it a reversal pattern because they expect the price to turn down after an uptrend. This guide explains how to identify the shape, how the usual trading idea works, and why the evidence for it is weaker than most articles suggest.
What the pattern looks like
Start with an uptrend. The price makes a peak, the left shoulder. It falls back to a trough. It rises to a higher peak, the head. It falls back to a trough at about the same level as the first. It then rises again to a third peak, the right shoulder, which is lower than the head and usually about the same height as the left shoulder.
The neckline runs through the two troughs. It can be flat or slope in either direction. The shape is only complete when the price falls back below the neckline after the right shoulder.
The inverse version appears after a downtrend. It has three troughs, with the middle one the lowest, and the neckline runs through the two peaks. Traders expect a reversal upward on a break above the neckline.
The idea behind the pattern
The traditional reading says the market has tried to push higher three times and failed. The head is the last strong push, and the right shoulder is a weaker attempt. When the price breaks the neckline, buyers are seen to have run out, and the trend is expected to turn.
This explanation is a story about how traders behave. It is plausible, and it is why the pattern is widely used. A story is not evidence, though. The question that matters is whether the pattern predicts what happens next, and whether the prediction is good enough after costs.
How traders use it
A typical plan has four parts.
- Identify the shape. Confirm the three peaks, with the head highest and the shoulders roughly level.
- Wait for the break. Enter, or prepare to enter, only after the price closes below the neckline.
- Set a stop. A common place for a stop is just above the right shoulder, because a return above it would mean the pattern has failed.
- Set a target. Traders often measure the distance from the head to the neckline and subtract it from the neckline break. This is a rule of thumb, not a forecast.
The target is the most used and least tested part. It assumes the price will fall as far again as the head is above the neckline. Nothing in the market guarantees that.
A worked example
Suppose a stock has a head at 120 and a neckline at 100. The head is 20 above the neckline. A trader who sees a clean break below 100 would measure 20 below the neckline and set a target of 80.
The risk is set by the stop. If the right shoulder peaked at 110 and the trader puts the stop just above it at 112, the risk per share is 12 (from a notional entry at 100 to the stop at 112). The reward to the target is 20. The reward-to-risk ratio is 20 divided by 12, about 1.7 to 1.
| Level | Price | What it means |
|---|---|---|
| Head | 120 | Highest point of the pattern |
| Neckline | 100 | The break level |
| Stop | 112 | Above the right shoulder: the pattern has failed if reached |
| Target | 80 | Neckline minus the head-to-neckline distance |
Those numbers are only the plan. The trade happens only if the price does what the plan says, and in most markets it does not always do so. Many breaks reverse back above the neckline, which traders call a failed breakout, and that triggers the stop.
How often it works
This is the important question, and the honest answer is that the pattern works less reliably than its popularity suggests.
Studies of chart patterns have produced mixed results. Some researchers found that certain patterns carry a small amount of information in past prices. Others found that the effects were small, varied from one market to another, and disappeared once trading costs were included. The shape of a pattern is easy to see after the fact, and that makes its record look better than a trader would have achieved by acting on it in real time.
The main problems are these.
- Hindsight. Patterns are often spotted only after the price has moved. A pattern that seems obvious in a chart from last year may have been impossible to call at the time.
- Subjective drawing. Two people can draw different necklines and different shoulders on the same chart. Each one sees a different pattern.
- Costs. Small gains from a pattern can be wiped out by spreads, commissions and taxes.
- Survivorship. People tend to remember the times a pattern worked and forget the many times it did not.
The guide on chart patterns: do they work? goes through how to test a pattern fairly, and it is the right place to start if you want to know whether a pattern helps you.
How to use the pattern without fooling yourself
If you use the head and shoulders, use it as a way to structure a decision, not as a promise. Some practical steps:
- Write the rules before you look at the trade. Define the shape, the break and the stop in advance.
- Keep a record of every time you see the pattern, including the ones you did not trade, and check what happened.
- Compare the result with simply holding or with a plain rule, such as trading only in the direction of the longer trend.
- Use the pattern alongside other information: the trend on a longer chart, the volume on the break, and the news for the company.
A pattern that worked in one market for one year may not work in another. Test it on the market you trade, over a period long enough to contain several different conditions.
Common mistakes
Calling a pattern that is not there. A messy chart can be made to look like a head and shoulders if you try hard enough. Require the clear three-peak shape, with the head clearly the highest.
Entering before the break. Buying or selling because the right shoulder looks like it is forming is a guess. Wait for the close below the neckline.
Ignoring the trend. A head and shoulders inside a strong uptrend can be a pause, not a reversal. Check the longer chart.
Treating the target as certain. The measured move is a guide, not a commitment. Plan for the trade to end at the stop as well as at the target.
Key takeaways
The head and shoulders is a reversal shape with three peaks and a neckline. Traders enter on a close below the neckline, put a stop above the right shoulder and set a target equal to the head-to-neckline distance. The shape is easy to describe and widely used, but its record in testing is mixed, and the target is a rule of thumb. Use it to structure a plan, record every case, and test it against a simple alternative before you rely on it.
This guide is for general information, not financial advice. See the disclaimer.