Scallops, Ascending

Core idea

An ascending scallop is a J-shaped price pattern that appears inside a rising trend. The left side begins at a minor peak, the price rounds down through a concave bowl, then climbs to a higher minor peak on the right. The right peak should sit clearly above the left — that asymmetry is what makes it a scallop rather than a cup or a rounding bottom.

Ascending scallops are not high-performance patterns on their own. Bull-market upward breakouts post a respectable 42% average rise, but with an 11% breakeven failure rate and an 18% no-go rate at the 10% threshold. The real value is structural: scallops appear in chains during healthy uptrends, and the width and height of consecutive scallops signal whether the trend is intact or exhausting. Narrowing, shorter scallops are the warning that the trend is ending.

Bulkowski's framing: Perhaps the only redeeming quality of ascending scallops is their ability to predict the end of the trend. That's invaluable. That's worth paying attention to.

Why it matters

Most chart patterns are point-in-time signals. The ascending scallop is a series signal — it tells you something about the rhythm of an uptrend across multiple scallops. A trend that prints three or four wide, tall scallops in succession is one to ride. A trend whose scallops are visibly contracting (narrower bowls, lower amplitude, the two rims pulling closer together) is one to start exiting.

The series rule: scallops shrink near the top

The first scallop in a new uptrend is usually the widest and tallest. As price climbs and the trend matures, successive scallops narrow and flatten. When you see a scallop where the left and right rims are nearly equal in height, the uptrend is likely nearing exhaustion. This is the single most useful diagnostic from the pattern.

Volume usually echoes the price bowl

The U-shaped volume pattern (high at the rims, low at the bowl's center) is typical but not required. Domed or irregular volume does not disqualify a scallop. The shape of price is the primary signal; volume is corroboration.

Key takeaways

Mental model

Copy sourceZoom

Practical application

Example

A semiconductor mid-cap is in a clean uptrend, rallying from $40 to $58 over three months. The first ascending scallop forms between $52 and $58 across six weeks: a minor peak at $58, a graceful bowl down to $52, then a climb back to a higher peak at $61. Width about six weeks; height about $9. Volume is U-shaped.

The trader notes the scallop as a continuation setup. Long at $61.50 on the close above the right rim, stop at $51.80 (just below the bowl low). Risk: $9.70 per share. Over the next two months, the stock rallies to $74, then begins a second scallop down to $66 and back up to a peak at $76.

The second scallop is narrower than the first — four weeks instead of six — and shorter in amplitude ($10 vs. $14). Healthy trend, but the contraction warning is starting to register. The trader takes partial profit at $74 and lets a smaller core position ride.

A third scallop forms in another four weeks: peak at $76, bowl at $72, right rim at $77 — narrower still, and now the two rims are within $1 of each other. The exhaustion signal is loud. The trader exits the remaining core at $76.80 on the rally to the right rim, without waiting for a confirmed breakout.

The stock subsequently prints one more small scallop, fails to break above $78, and rolls over to $66 over the next three months — a 13% decline that the trader avoided entirely by reading the series signal. The initial trade booked a ~$13 gain; the series-driven exit converted what could have been a give-back into a clean turn at the highs.

The single-pattern setup was profitable. The series interpretation made the trade twice as good.

Related lessons