Broadening Wedge, Ascending

Core idea

The ascending broadening wedge has two up-sloping trendlines that diverge — the upper line steeper than the lower — producing a pattern that looks like a megaphone tilted uphill. Price oscillates between the lines with progressively wider swings. The pattern typically appears at the end of a rising trend and most often acts as a reversal, though continuations occur. Downward breakouts are slightly more common than upward, but the pattern's reputation is built on its 31% failure rate for downward breakouts — twice the failure rate of upward ones.

The buyer's hand

Bulkowski's tour explains the geometry as the residue of persistent institutional accumulation. A fund buying in size pushes price up, momentum players chase, the stock overshoots, profit-takers sell, but the buy-the-dip crowd plus the patient fund support a higher low. Each successive cycle prints higher highs (from momentum buying) and higher-but-saner lows (from disciplined accumulation) — until the institutional buyer satiates and the floor disappears.

Why the downside is treacherous

Both trendlines tilt up, which means buying demand is structurally present underneath the pattern. A downward breakout smashes into that demand, often producing a 5% failure followed by a reversal back up. For long-term holders this is good news; for short-sellers it is a hazard. The flipside: when a downward breakout busts (47% of the time), 75% of the busts go on to substantial rises — average +65% on the busted patterns.

Why it matters

This is one of the few patterns where the busted-breakout setup outperforms the textbook setup. A trader who waits to short a downward breakout will be wrong nearly one time in three; a trader who instead buys when a downward breakout fails enjoys an average 65% rise (median 44%). Recognizing the failure pattern is more profitable than recognizing the pattern itself — a useful inversion for anyone who has been trained to follow breakout direction blindly.

Key takeaways

Mental model

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Practical application

Two trade ideas, ranked

The partial-rise signal

Example

A semiconductor stock rallies from $30 to $50 over six months. Over the next four months it forms an ascending broadening wedge: highs at $52, $58, $64, $71; lows at $46, $48, $50, $54. Lines drawn through the highs and lows both slope up, with the upper line steeper.

The stock breaks below the lower trendline at $58 — textbook short setup. A disciplined trader skips it. Two weeks later, price has fallen only to $56 (a 3% drop) and then surges back through $60. This is a busted downward breakout. The trader buys at $60.50 with a stop at $55 (below the failure low). Three months later, price is at $89 — a 47% gain.

The contrarian who shorted the original breakout closed for a small loss when the bust triggered, paying the spread twice for nothing. The trader who fades busts compounds gains while everyone else gives up on the pattern.

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