Descending Triangle Pattern: How to Identify It and How It's Read
A descending triangle pairs a flat support line with falling highs, and is traditionally read as bearish. Here's how to identify one, what confirms it, and where it fails.
A descending triangle is a chart pattern with a flat horizontal support line on the bottom and a falling trendline of lower highs above it. The lines converge, squeezing price into a narrowing range. It's traditionally read as a bearish pattern, the mirror image of the ascending triangle.
The Structure
- Flat support. Price repeatedly falls to roughly the same low and bounces. Two or more touches are usually needed.
- Falling resistance. Each rally peaks at a lower high than the one before. A line through at least two of those highs slopes downward.
- Convergence. The lines move toward each other, forming a triangle with a flat bottom.
- Breakdown. Price closes below the flat support (the usual expectation), or above the falling resistance (the failure case).
It typically takes weeks to a few months on a daily chart.
Why It's Read as Bearish
The traditional story is the reverse of the ascending triangle. Buyers keep defending the same price, which holds the lows flat. But sellers are getting more aggressive, willing to sell at a lower price each time instead of waiting for a stronger bounce. The falling highs suggest supply is increasing against a fixed level of demand. Eventually, the floor is expected to give way.
The floor getting retested again and again is also sometimes read as a sign that the buyers waiting at that level are being used up.
Volume
The commonly described profile:
- Volume contracts as the triangle narrows.
- Volume expands on the breakdown below support.
See what volume confirms a breakout for how that's measured.
The Traditional Price Target
- Measure the height of the triangle at its widest point, between the first high and the flat support.
- Project that distance downward from the breakdown.
Example. Support is at $40. The first high was $48 (height $8). Price breaks below $40. Measured target: $40 − $8 = $32.
It's a convention, not a forecast. See how to measure a price target.
Where It Fails
- It breaks up. Despite the bearish lean, price can break above the falling resistance and run higher; a descending triangle in a strong uptrend is a particular case where the "bearish" reading often fails.
- Fakeouts. A close below support can quickly reverse. See false breakouts.
- Subjective lines. Different anchor points produce different triangles.
- Late breakdown. Breakouts near the apex are often described as less reliable.
- Short squeezes. In heavily shorted stocks, a sharp bounce can break the upper line.
Descending vs. Other Triangles
| Triangle | Top | Bottom | Traditional lean |
|---|---|---|---|
| Ascending | Flat | Rising | Bullish |
| Descending | Falling | Flat | Bearish |
| Symmetrical | Falling | Rising | Follows prior trend |
Our triangle patterns guide covers all three, and the descending triangle often appears as a continuation pattern in a downtrend; see continuation patterns.
For the research on whether patterns predict anything, see do chart patterns actually work.
This article is for educational purposes only and is not investment advice.
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