Pennants

Core idea

A pennant is a short consolidation that hangs off the end of a sharp, near-vertical price move (the flagpole). Two converging trendlines bound the pause, forming a small triangular pennant shape that usually tilts against the prevailing trend. After the pause, price resumes in the original direction — most of the time.

The textbook claim that pennants are "half-staff" patterns — meaning price travels as far after the pennant as before it — does not hold up under Bulkowski's 2,106-pattern dataset. Pennants appear, on average, only 55–57% of the way along the trend, not midway. The measure rule (project the flagpole height past the pennant) is met only 32–46% of the time. Pennants work as continuations, but the magnitude of the move after is usually less than the move before.

Bulkowski's framing: Pennants are common, but the half-staff theory is wrong. Don't budget for a full flagpole-equal move after the breakout — expect roughly half of that, and you'll be more accurate.

Why it matters

Active swing traders hunt pennants because they are short (median 8 days), frequent, and offer clearly-defined entries and stops. The flagpole tells you direction; the pennant trendlines give you a precise breakout trigger; the pennant lows or highs give you a stop. Risk-reward is naturally tight — a typical pennant trade resolves within two weeks.

Pennant vs. flag — shape matters

A flag has two parallel trendlines (rectangular shape); a pennant has converging trendlines (triangular shape). Both follow flagpoles and act as continuation patterns with similar statistics. The shape difference is not just cosmetic — the converging lines of a pennant compress volatility into a single apex, which makes the breakout more decisive when it comes. Flags have more room to drift before resolving.

Pennant vs. symmetrical triangle — duration matters

A symmetrical triangle has the same converging-lines shape but lasts weeks to months, not days. Pennants are capped at three weeks; anything longer is classified as a triangle or wedge. The pennant's brevity is its definitive feature — it is a short pause inside a fast trend, not a multi-week consolidation.

Key takeaways

Mental model

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Practical application

Example

A biotech stock issues positive trial data and rips from $42 to $58 in seven trading days on heavy volume — that's the flagpole, a near-vertical $16 move with minimal overlap.

For the next nine days, the stock consolidates between two converging trendlines. The upper line drifts from $58 down to $56; the lower line drifts from $54 up to $55. Volume during the pause is well below the flagpole average. A small triangular pennant tilted slightly against the trend.

A swing trader sets a buy-stop at $56.50, one tick above the upper trendline. On day 10, price gaps to $57 and closes at $58.60 on volume back to flagpole levels. Fill at $56.50; stop placed at $54.40 (below the lower pennant boundary). Risk per share: $2.10. Measure-rule target: $56.50 + $16 (flagpole) = $72.50. Realistic partial target: $56.50 + $8 = $64.50 (50% of flagpole).

Over the next eight trading days, price advances to $64.80 on declining volume. The trader scales out of two-thirds of the position at $64.50 for an $8 gain. Trailing stop on the remainder set to $61 (the prior intraday low).

The stock stalls near $66 and rolls over to $61.50, triggering the trailing stop. Final move: $9.50 of upside captured against $2.10 of risk — roughly 4.5-to-1, well above the median pennant outcome but typical of trades managed with partial profits at the halfway target.

The measure-rule target of $72.50 was never reached — landing this trade in the ~55% of pennants that fall short. The trader's structural exit at the trailing stop converted a "short-of-target" pennant into a clean 4.5-to-1 winner. The discipline of taking partials at the halfway mark is what makes the math work over many trades, given how often the full target fails to hit.

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