The idea
A bull flag has two parts. The pole is a sharp rise on strong candles. The flag is a short, orderly drift down or sideways that follows, often with smaller candles and lighter volume.
The strategy buys the close above the flag's high, with the stop under the flag's low, and the classic target is the pole's height added to the breakout. The bear flag is the mirror image after a fast drop.
Watch it play out
Step by step
The rules
Setup
- A strong pole, then three to eight candles drifting down in a narrow band.
- The flag holds above the middle of the pole.
Entry
- Buy on a close above the flag's high.
Stop-loss
- Under the flag's low.
Target
- The pole's height added to the breakout point.
Filters that help
- Volume shrinking during the flag and rising on the break.
- Flags that retrace more than half the pole are weaker.
Why it can work
The pole shows strong demand. A shallow, quiet flag shows little selling against it: early buyers taking some profit, not a reversal. When the flag breaks, those waiting to buy the dip and the shorts who bet on it reversing push the next leg.
Flags also keep risk small: the flag's low is close to the breakout, so the stop is tight compared with the pole's height. A strong trend with a shallow pause therefore offers one of the better risk to reward set-ups among chart patterns, when it works.
Worked example
A stock runs from $30.60 to $34.10 in three candles, then drifts to $33.35. A candle closes at $34.05 above the flag: buy, with the stop at $33.15.
The pole was $3.50 tall, so the target is $37.55. Risking $100, the 90-cent stop allows 111 shares.
When it works, when it fails
Works best
In strong trending markets and in stocks moving on news, where pauses are brief.
Struggles
When the flag keeps falling and turns into a reversal, or when the break fails right away. Many 'flags' are drawn after the fact.
Common mistakes
- Calling any pullback a flag, even deep ones.
- Buying inside the flag before the break.
- Expecting the full pole-height target every time.
Variations
- Pennant
- The same idea with a small symmetrical triangle instead of a downward channel.
What the evidence says
Evidence: Popular, untestedWidely used, but no rigorous public testing. An idea to test yourself.
Flags are among the most popular continuation patterns in trading books and courses, but we know of no rigorous public study of flag trading rules after costs.
Pattern statistics shared online usually come from hand-picked charts. Write down a precise definition and test it on your own records.
Questions
- What volume pattern confirms a bull flag?
- Strong volume on the pole, lighter volume during the flag, and rising volume on the breakout. Heavy selling volume during the flag is a warning sign.
- How deep can the flag pull back?
- A shallow flag, retracing a third of the pole or less, is the classic shape. Once the pullback passes half the pole, it is usually treated as something other than a flag.
- Does the bull flag work on crypto?
- Flags are common in crypto's fast moves, especially on four-hour charts. Breaks can fail hard in crypto too, so the stop under the flag matters as much as anywhere.
- What is a bull flag?
- A sharp rise (the pole) followed by a short, orderly pullback (the flag), traded on a break above the flag.
- How long should a flag last?
- Usually three to eight candles. A flag that drags on for much longer often loses its meaning.
- What is a bear flag?
- The mirror image: a sharp drop, a short drift up, and a sale on a break below the flag.