The Wedge Pattern: How Converging Boundaries Set It Apart from a Triangle

A wedge is a stretch of the chart where the price keeps moving in its previous direction, but each successive impulse is shorter than the one before it, and the boundaries of the move converge while sloping in the same direction. It is precisely this shared slope of both boundaries that separates a wedge from a triangle: in a triangle the boundaries converge towards each other or one of them is horizontal, while in a wedge both the upper and the lower line point up, or both point down. The meaning of this geometry is simple: the trend is still running, but more and more energy is being spent on new highs while the price gain keeps getting smaller. That is why a wedge is most often read as a signal of exhaustion rather than of continuation.

How the narrowing range is built

To speak of a wedge at all, you need repeated touches on each side — local highs that fall on one line and local lows that fall on another. Both lines slope in the same direction, and they gradually draw closer together. Inside the pattern the amplitude of the swings contracts: ground that used to be covered in broad strokes now fits into a narrow band.

The mechanics behind this compression are as follows. In a rising wedge the buyer still manages to reach new highs, but to do so has to buy up ever shallower dips — demand does not have time to recover before it is spent again. The seller, by contrast, stops retreating far: the pullbacks no longer reach the previous support levels. From the outside this looks like a rally, but underneath it is a rally running on the last remaining orders. When the next attempt is not enough even for a small gain, the price turns down — and it falls fast, because lower down, in the compression zone, there are no dense buy orders left.

Rising and falling wedges

A rising wedge forms when both the highs and the lows are moving higher, but the lows are rising faster and catching up with the highs. A pattern like this usually resolves to the downside. It appears both at the top of an uptrend — in which case it is a reversal — and inside a downtrend as an upward correction that runs out of steam and returns the price to its decline.

A falling wedge is the mirror image: the highs and the lows are both declining, but the highs are declining more steeply. The seller is still pushing the price lower, yet the rebounds from below are becoming more and more insistent. Such a pattern, as a rule, resolves to the upside: either as a reversal after a long decline or as a pause within an uptrend.

Reversal or continuation

The awkward thing about a wedge is that it is not rigidly tied to any single class of patterns. It can work as a reversal pattern and as a continuation pattern — and which one it is can be read not from the shape but from the context: which way the wedge slopes relative to the trend in which it arose. A wedge that slopes against the main trend almost always means a correction and works in favour of continuation. A wedge that slopes with the trend means exhaustion and works in favour of a reversal. Both classes are examined in the articles on reversal patterns and on continuation patterns — a wedge should be read together with them, not in isolation.

What a wedge is not

A triangle is not a wedge: its boundaries have no common slope. A flag is not a wedge: a flag's boundaries are parallel, the range does not narrow, and the very sign of exhaustion is absent. A channel is not a wedge either, for the same reason. This is not a difference of terminology: the narrowing of the range is the substance of the signal. If the boundaries are not drawing together, reading the pattern as a wedge means inventing a signal that is not on the chart.

What confirms the pattern and what invalidates it

The accompanying sign is fading activity inside the narrowing range and a burst of it on the breakout. If volume is rising inside the wedge, the compression is most likely illusory, and the lines have been drawn through random points. Boundaries drawn through a few scattered touches can be fitted to whatever one wishes to see — the fewer confirmations each line has, the weaker the pattern.

The pattern is considered to have played out once the price has moved beyond the converging boundary and held there. The pattern is considered to have failed if the price reaches the point where the lines meet and simply passes through it without a directional breakout: the compression has dissolved, and there is nothing left to trade. A separate trap is a breakout that immediately returns inside the pattern; in that case the original assumption about direction no longer holds, and holding the position "on hope" means paying for a broken hypothesis.

What to look at

A wedge is visible only over a sufficiently long history, which is why the pattern is checked on different chart timeframes: a narrowing on the minute charts inside a wide sideways range on the daily charts is usually not worth attention. Before entering, it is useful to check the corporate events calendar — the timing of a breakout from a wedge often coincides with the publication of financial reports, and then the move is driven not by geometry but by the news. Quotes and charts for Russian securities are in the stocks section, and the other concepts of technical analysis are collected in the glossary.