Bull Flag Pattern: What It Is and How to Trade the Breakout
After a sharp rally, the price often doesn't reverse but “rests” in a narrow channel. That's a bull flag, a trend continuation pattern. Here's how to trade it.
What it looks like
- Flagpole: a sharp rally over a few strong candles, often on high volume.
- Flag: a short, calm pullback in a narrow channel, tilted slightly down or flat. Volume drops during it.
- Breakout: the price breaks out of the channel to the upside, and volume picks up again.
The mirror pattern in a decline is the bear flag.
How to trade it
| Where | Example | |
|---|---|---|
| Flagpole | From the start of the surge to the top | $100 → $120 |
| Flag | Pullback in a channel | $120 → $114 |
| Entry | After a break above the flag's upper boundary | ≈ $117 |
| Stop-loss | Below the flag's lower boundary | ≈ $113 |
| Target guide | Flagpole height from the breakout point | ≈ $137 |
The target is only a guide. You can close part of the position earlier and manage the rest with a trailing stop.
How to tell a flag from a reversal
- The pullback is shallow: usually less than half the flagpole. Deeper than that, it's no longer a flag.
- The pullback is short in time compared to the flagpole.
- Volume falls during the flag. Rising volume on the decline is a warning sign.
A flag is a continuation pattern, so it only works in a trend. How to identify one is covered in the article trend trading and in the lesson candlesticks and chart patterns.
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- A bull flag is a pause after a sharp rally.
- Enter on the flag's upside breakout; the stop goes below the flag.
- A deep pullback is no longer a flag but a possible reversal.
Frequently Asked Questions
Which timeframe should I look for flags on?
Any, but patterns are more reliable on the hourly and daily charts. Minute charts have too much noise.
What if the flag breakout turns out to be false?
If the price falls back into the channel or below it, the stop-loss under the flag will trigger. That's why the stop is set before you enter, not afterward.
How is a flag different from a pennant?
A flag has parallel boundaries; a pennant's boundaries converge into a triangle. The trading logic is the same.
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