Bat, Bullish

Core idea

The bullish bat mirrors the bearish bat: five turns X (low) → A (high) → B (low) → C (high) → D (low), four Fibonacci constraints (with .886 as the AD/AX gate), and the same rarity. What sets it apart from every other Fibonacci pattern Bulkowski tested is its statistical headline: price turns up at D 91% of the time, the average rise after D is 44.3%, and the breakeven failure rate is just 10.2%. Of the five bullish Fibonacci patterns in the Encyclopedia, the bullish bat ranks #1 in performance.

A small sample, but a loud one

Bulkowski found only 259 bullish bats — too few to be confident at every cut, but enough to highlight that the pattern behaves dramatically better than its peers. The bullish AB=CD reverses at D only 38% of the time; the bullish bat reverses 91%. That gap is too large to be noise.

Why it matters

For a swing trader, "price will form a low here 91% of the time" is one of the strongest single-bar signals technical analysis offers. Combine it with the measure rule (height A − X added to A gives an upside target) and the post-D turn statistics (price reaches B 86% of the time, A 58% of the time), and you have a complete trade plan derived entirely from the pattern's geometry.

Key takeaways

Mental model — bullish bat lifecycle

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Identification guidelines

• AB/AX retrace. (A − B) / (A − X) ≈ .382 or .5 (using the high-low range of B).
• CB/AB retrace. (C − B) / (A − B) matches a listed Fibonacci ratio.
• CD/CB extension. (C − D) / (C − B) matches a listed extension.
• AD/AX = .886 ± 3%. Critical gating ratio. Bulkowski allows up to 3% tolerance because patterns are so rare.
• Duration. Six-month cap.
• Volume. Trends lower 80% of the time across the pattern. Downward volume trend correlates with the best performance.

How the pattern fails

Two failure modes, both rare:

1. Price continues lower past D without reversing (~9%). Stop should sit just below D's low.
2. Price reverses at D but rises ≤5% — a "breakeven failure" (~10%). The two failure modes overlap; both are accounted for in the 10.2% breakeven rate.

Practical application

A high-conviction trade plan

1. Software flags ABC and projects D using the four Fibonacci constraints.
2. Set a price alert at D ± 1%.
3. When D prints, wait for a confirming green bar (close above the bar that touched D).
4. Buy at the next open. Stop a few cents below the low at D (or below a nearby round number for psychological insulation).
5. Compute targets: B (closest pattern turn above D), A (top of pattern), and the measure-rule target A + (A − X).
6. Scale out: 1/3 at B, 1/3 at A, 1/3 trails on the measure-rule target.
7. If price closes below D's low, exit immediately — the 9% failure mode is in play.

Example: a high-quality bat on a fictional consumer stock

A fictional consumer stock CON prints X = 9.76, A = 12.90, B = 11.40–11.81 (range), C = 12.57, projected D ≈ 10.19–10.81. Each ratio qualifies:

• AB/AX using B's range: 0.35 to 0.48 → spans .382 ✓
• CB/AB: 0.39 to 0.78 → spans .5, .618 ✓
• CD/CB using D's range: 1.50 to 2.03 → spans 1.618 and 2 ✓
• AD/AX using D's low: 0.86 → within .03 of .886 ✓

A trader buys at 10.50 after a confirming green bar from the D low. Pattern height = 12.90 − 9.76 = 3.14. Measure-rule target = 12.90 + 3.14 = 16.04. Stop at 9.95 (just below X, conservatively). Risk = 0.55, reward to A = 2.40 (4.4:1), reward to measure target = 5.54 (10:1). Even at B (11.81), a partial exit returns 2.4:1 on the entire risk.

Where this fits in the family

The bullish bat is the headliner of the Fibonacci family. Its bearish twin (Bat, Bearish) is similarly well-behaved on the down side. AB=CD (AB=CD, Bearish, 4) is the more common but weaker cousin. For non-Fibonacci bullish reversals, the Big W (Big W) is the natural pair-trade pattern — a double-bottom variant with statistically comparable upside (46% average rise) and far better availability.

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