Scallops, Descending and Inverted

Core idea

The descending and inverted scallop completes Bulkowski's four-scallop family. Where the ascending variants curl upward like the letter J, this one looks like an upside-down J: a downtrend leads in, price bumps up and rounds over into an inverted bowl, then slides down a sharp straight-line decline to a new low, ending with a small hook back up before the breakout. It is a bearish continuation pattern — price almost always breaks out downward and continues lower, reaching the ultimate low in under two months.

The pattern's headline weakness is its measure rule: fewer than a third of trades reach the projected target. The decline arrives, but it rarely arrives by as much as you would hope.

Why it matters

Descending inverted scallops are common in bull markets with downward breakouts, and they rank in the top ten for performance in their best configuration. They give traders a recognizable shape — and a short, time-bounded one — for joining an ongoing downtrend with a clear entry trigger (close below the pattern's lowest low) and a clear invalidation point (close above the inverted bowl). Get the direction right and you have a fast trade; expect the magnitude to disappoint and you size positions accordingly.

Where it fits in a downtrend

A single descending inverted scallop is a continuation. When you find several in a row inside the same bull-market downtrend, they tend to get narrower and shorter as time passes — the same compression that marks the late stages of many trends. A short, narrow scallop late in a sequence is a warning that the move may be exhausting, not an invitation to short more aggressively.

Key takeaways

Mental model

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Practical application

Trading the breakout

Late-pattern compression as exhaustion signal

When you see three or more descending inverted scallops in the same downtrend and each one is shorter and narrower than the last, the trend is compressing. Shorten holding periods, tighten stops, and stop adding to short positions. The first scallop that fails to break down is usually the one announcing the reversal.

Example

Imagine an industrial-supply stock has been declining for three months. It puts in a minor low at $42, bounces to $48 in a smooth rounded arc over two weeks, then plunges to a new low of $40 in eight trading days. Price then hooks up to $41.50 and stalls.

• Entry trigger: a daily close below $40.00.
• Stop: $48.10 (one tick above the inverted bowl high). Risk: roughly 20%.
• Position sizing: because the measure-rule target ($48 − $40 = $8 → projected $32) rarely arrives, size for a realistic $4-5 move, not the full projection.
• Outcome A (typical): price closes at $39.20, drifts to $36 in three weeks, throws back to $39 for three days, then resumes lower to a $35 ultimate low. Exit at $36 captures most of the move. About a 10% gain.
• Outcome B (failure): price closes at $39.80 but reverses within two days, climbs back through the bowl high, and stops you out for a 20% loss. The high stop is the price of letting the pattern prove itself.

The asymmetry is the whole game: many small wins, occasional large losers, and a portfolio that needs the win-rate to compensate. Trade size accordingly.

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