Scallops, Descending

Core idea

A descending scallop is a reversed J — the left rim sits high, price curves down through a bowl, and the right rim recovers to a level below the left. The pattern appears most commonly in declining price trends and acts as a bearish continuation: the bowl is the brief countertrend rally that breaks down, and the right-rim-below-left geometry marks lower highs.

In Bulkowski's catalogue of nearly 3,000 patterns, descending scallops shine in bear markets with downward breakouts — performance rank 6, single-digit failure rate. In bull markets, the pattern is much weaker, and upward breakouts are essentially countertrend setups with mediocre statistics. The pattern's structural meaning — "rally fails to reach prior high, decline resumes" — only matters when the macro trend is already bearish.

Bulkowski's framing: Scallops may make a tasty meal, but as a chart pattern they leave me hungry except in bear markets where the performance rank is sixth and failures are in the single digits. Use them where they work; skip them elsewhere.

Why it matters

For short-side swing traders in bear regimes, the descending scallop is one of the cleanest available setups. The bowl bottom provides a precise breakdown trigger (close below the bowl low) and the prior right rim provides a natural stop level. Even the failure modes are diagnosable — the most common cause of failure is a hidden support zone that absorbs the breakdown.

The 56% retrace rule

The average rally from the bowl low (C) up to the right rim (B) is 56% of the prior decline (A to C). This is the inverse mirror of the inverted ascending scallop's 54% retrace, and it gives traders a way to assess pattern quality: rallies in the 40–70% range are textbook; very shallow rallies suggest the pattern is still forming; very deep rallies that nearly reach A suggest the trend is reversing.

Width contraction works in reverse

In a series of descending scallops along a downtrend, the patterns narrow as the decline ages — the same series rule as ascending scallops. When you see three or four descending scallops with the right rims approaching the left rims in price, the downtrend is likely ending. This is the bearish counterpart to the ascending-scallop exhaustion signal.

Key takeaways

Mental model

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Practical application

Example

A retail mid-cap is in a six-month downtrend, declining from $44 to $30 on weak earnings and sector headwinds. The market backdrop is bearish; the S&P is down 8% YTD.

The stock prints a minor high at $34 (point A), drops over four weeks to $28 (point C), and rallies over three weeks to $31.50 (point B). B is clearly below A; the rally is $3.50 against the $6 prior decline — a 58% rally, within the textbook range.

A trader recognises the descending scallop in a bear-market context — the high-quality variant. Scan for hidden support below $28: the next visible swing low is at $25.80 from eight months prior, leaving roughly $2.20 of clean air. Acceptable.

Sell-stop set at $27.50, just below the bowl low. Two weeks later, the stock closes at $26.80 on volume above the pattern average. Short fills at $27.50. Stop at $32.00 (just above B). Risk per share: $4.50. Measure-rule target: $27.50 - $6 (A-to-C distance) = $21.50.

Ten days after the breakdown, price rallies to $27.30 — a textbook pullback to the breakdown level — then resumes lower. The trader holds. Over the next four weeks, the stock declines to $22.40, a 19% gain on the short trade.

The trader covers half at $24 (rough midway target), trails the rest with a 10-day high stop, and exits the runner at $23.40 when the trend rolls into a bottom-fishing rally. Blended exit: $23.70 against the $27.50 entry — about $3.80 of gain on $4.50 of risk, or 0.85-to-1.

That's a modest individual-trade outcome, but the high success rate of bear-market descending scallops (single-digit failure rate at the breakeven threshold) means this trade prints reliably. A book of these setups in a bear market compounds into a serious edge; trying the same setup in a bull market would erode that edge fast.

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