Chart Patterns
Common chart formations like head and shoulders, triangles, and double tops/bottoms.
⏱️ ~8 min read
Key Takeaways
- Chart patterns are recognizable shapes formed by price movements over time, often categorized as reversal or continuation patterns
- Common patterns include head and shoulders, double tops/bottoms, and triangles
- Patterns are identified visually and involve a degree of subjectivity — different observers may draw them differently
- Volume and the broader trend context are often considered alongside the pattern itself
What chart patterns are
Chart patterns are recognizable shapes or formations that emerge from a sequence of price movements over time, which traders have historically associated with certain tendencies in subsequent price behavior. They're generally grouped into two broad categories: reversal patterns (suggesting a potential change in the prevailing trend) and continuation patterns (suggesting the prevailing trend may resume after a pause).
Like other technical analysis tools covered in this section, chart patterns are based on historical observation and widespread use among traders — they describe tendencies, not certainties, and identifying them involves a degree of subjectivity.
Head and shoulders
A 'head and shoulders' pattern is a reversal pattern often associated with the end of an uptrend. It consists of three peaks: a left shoulder (a peak, followed by a decline), a head (a higher peak, followed by another decline), and a right shoulder (a peak roughly similar in height to the left shoulder, followed by a decline). A line connecting the lows between the peaks is often called the 'neckline,' and a decisive move below the neckline is sometimes interpreted as confirming the pattern.
An 'inverse head and shoulders' is the mirror-image pattern, often associated with the end of a downtrend, consisting of three troughs in an analogous arrangement.
Double tops and double bottoms
A 'double top' is a reversal pattern where price reaches a high, pulls back, rallies again to a similar high (the 'second top'), and then declines — sometimes interpreted as a sign that the price faced resistance at roughly the same level twice and may be more likely to turn lower. A 'double bottom' is the mirror-image pattern at lows, sometimes interpreted as a potential sign of a bottoming process.
Example: A double top in context
A stock rallies to $120, pulls back to $105, rallies again to roughly $121 (a similar high), and then declines below $105.
Some traders would describe this as a double top, with $105 (the low between the two peaks) sometimes referenced as a level whose breach might be watched for confirmation.
As with all chart patterns, the stock could also break above $121 instead, which would mean the 'double top' interpretation didn't play out as some might have expected.
Triangles
Triangle patterns form when price action narrows over time, creating converging trendlines. A 'symmetrical triangle' has a descending upper trendline and an ascending lower trendline converging toward each other — often categorized as a continuation pattern, where the eventual breakout direction is sometimes thought to align with the prevailing trend before the triangle formed, though this isn't guaranteed.
An 'ascending triangle' has a flat (horizontal) upper trendline and a rising lower trendline, sometimes associated with a tendency toward eventual upside breakouts. A 'descending triangle' is the mirror image, with a flat lower trendline and a falling upper trendline, sometimes associated with a tendency toward downside breakouts. These associations reflect commonly cited tendencies, not certainties.
Flags and pennants
'Flags' and 'pennants' are short-term continuation patterns that often form after a sharp price move, representing a brief pause or consolidation before (according to the pattern's traditional interpretation) the prior trend potentially resumes. A flag appears as a small rectangular consolidation, while a pennant appears as a small symmetrical triangle — both typically forming over a relatively short number of periods compared to the move that preceded them.
A note on subjectivity and reliability
Because chart patterns are identified visually, different traders looking at the same chart may draw pattern boundaries somewhat differently, or disagree about whether a pattern is even present. Studies examining the historical reliability of various chart patterns have produced mixed results, and many practitioners view patterns as one input to consider alongside trend context, volume, and other indicators — rather than as standalone trading signals.
Frequently Asked Questions
Do chart patterns guarantee a certain outcome?+
No — chart patterns describe tendencies observed across many historical instances, but any individual occurrence can fail to play out as the pattern's traditional interpretation suggests. They're generally used as one input among several.
How long does a chart pattern take to form?+
This varies enormously — some patterns (like flags) can form over just a few periods, while others (like head and shoulders on a weekly chart) can take months to develop. The time frame of the chart being viewed affects the apparent duration.
Is volume important when evaluating chart patterns?+
Many traders consider volume alongside chart patterns — for example, watching whether volume increases during a potential breakout from a pattern, as covered in the Volume Analysis lesson, since volume is sometimes used to gauge the conviction behind a pattern's resolution.