Flag and pennant breakout
BreakoutBeginner
A flag or pennant is a short pause after a sharp move. The flag is a small channel that slopes against the impulse. The pennant is a small triangle. The continuation rule buys a break in the direction of the impulse once price leaves the pause. It is a chart pattern, so the definitions have to be written down or the eye will cheat.
Not investment advice. Nothing here is a recommendation to buy or sell anything. Backtests and historical studies are not guarantees, and a rule that worked in one sample can fail in the next. Trading can lose money. Links are for education, not endorsements. Do your own research.
- Rules
- Require a prior impulse of several bars that outruns the average true range. Then require a tight consolidation of a few bars. Buy a close above the flag or pennant in an up-impulse, with a stop under the pattern. A common target is the height of the impulse projected from the breakout. If price drifts out the wrong side, the pattern is cancelled.
- Where AI fits
- AI can encode impulse size, consolidation length, and breakout close so the pattern is testable. It should show the rejected setups, not only the textbook picture. Parameter choices for 'sharp' and 'tight' belong in a training sample. A model that labels screenshots after the move has resumed is not evidence.
- Markets
- Liquid stocks, futures, and FX.
- Timeframes
- 15-minute to daily, as long as the impulse and the pause are defined on that chart.
- Risks
- Most pauses are not flags. Loose definitions turn every pullback into a pattern. Stops inside a tight pennant are hit by noise. The measured-move target is a story, not a contract. Thin names print flags that cannot be traded in size.