Trading glossary
Reversal pattern
By the PatternX team · Published
Definition
A reversal pattern is a chart formation that marks a likely change in trend direction, from up to down or from down to up, such as a head and shoulders, a double top or bottom, or a rounding bottom.
How it works
A reversal pattern records the point where a trend loses its driver. At a top, buyers keep pushing to new highs until they can't: rallies stall at a similar level or fall short, and pullbacks start breaking earlier lows. At a bottom, the same happens in reverse. The pattern is complete only when price breaks the level separating the old trend from the new one, usually a neckline.
Common reversal patterns:
- Head and shoulders and its inverse.
- Double and triple tops and bottoms, such as the double bottom.
- Rounding tops and bottoms, like the rounding bottom, which reflect a gradual shift rather than a sharp one.
- Wedges against the trend: a rising wedge in an uptrend or a falling wedge in a downtrend.
The essential precondition is a trend to reverse. A "double bottom" in the middle of a sideways range is just two touches of support.
Why it matters
Reversal setups can offer attractive reward-to-risk, because they aim to catch a new trend early with the stop just beyond the final extreme. The trade-off is that you are trading against the established direction, so waiting for the break and keeping the stop firm matter even more.
Example
For example, suppose a stock falls from $45 to $30, bounces to $34, and drops back to $30.40 before rallying again. Two lows about 1.3% apart with a $34 reaction high between them form a possible double bottom. A close above $34 completes it and projects the roughly $4 height to about $38. A drop below $30 would cancel the idea.
Common mistakes
- Calling the top early. Selling the second peak before the neckline breaks is a prediction, not a pattern.
- Ignoring the prior trend. No trend, no reversal.
- Expecting an instant new trend. Many reversals turn into ranges first.
How PatternX uses it
PatternX's continuation and reversal labels are descriptive, and none of its reversal detectors checks the trend before the pattern; only the rectangles do. A PatternX double bottom is detected from geometry alone: two swing lows 8–50 bars apart, equal within 2.5%, with a neckline at least 2% away. Check the preceding trend yourself. The PatternX Score also rewards a trend that agrees with the trade, measured with the 20- and 50-period EMAs, and a fresh reversal may not have that yet. See pattern detection.