Define the bull flag before studying its exit: context, boundaries, volume and invalidation belong in the same written research record.
What defines the bull flag
A bull flag begins with a distinct upward pole, followed by a shorter pause inside roughly parallel boundaries. The pause often slopes downward or sideways. Separate the steep pole from the slower retracement; a broad rising channel without that impulse does not become a flag simply because its lines are parallel.
The preceding trend and duration
The continuation thesis asks whether a rapid advance can resume after a brief correction. Compare the depth and duration of the pause with the pole. A deep retracement through the pole origin or a long base changes the pattern being studied and should be labelled accordingly.
The illustrated pause occupies 11 sessions. Its average volume is 38% of the pole’s average. These are measurements of this drawing, not thresholds that define every pennant or flag.
A close beyond the boundary
The upward example closes above the upper flag line. The measured illustration adds the pole height to the boundary at the exit, rather than to the top of the pole. The flag low provides a separate structural level to review when writing invalidation rules.
| Measurement | Value |
|---|---|
| Event session (leftmost bar is session 1) | 30 |
| Boundary at the exit | 50.20 |
| Close of the exit session | 51.05 |
| Distance beyond the boundary | 1.69% |
| Pole height | 11.00 |
| Conventional projected level | 61.20 |
Illustrative objective = 50.20 + 11.00 = 61.20The projection is a geometric reference. It is not a price forecast, a probability or an instruction to hold until that level. Describe what would contradict the premise before comparing the potential distance with the risk.
Volume through the formation
Compare volume with this stock’s own recent activity and inspect the bars on which it expands. Contracting activity during a pause and expansion at its exit can support a conventional reading, but volume does not choose the direction. A large session may reflect an event, rebalancing or an isolated trade.
| Measure | Hypothetical value |
|---|---|
| Pole, average per session | 187.0 |
| Flag, average per session | 71.5 |
| Breakout session | 240.0 |
| Breakout ÷ 20-session average | 1.90 |
The displayed relative-volume calculation divides the event’s volume by the average of the 20 sessions ending with that event; it includes the event itself. It differs from a comparison with the prior 20 sessions and from an intraday comparison at the same clock time.
When the conventional reading fails
In the second chart the pause breaks below its low instead of resuming upward. The earlier pole does not make the later decline a successful continuation. A failed flag can become part of a larger range or reversal; that new structure needs a fresh definition.
Separate this shape from nearby patterns
A bull pennant narrows toward an apex rather than keeping parallel lines. A falling wedge converges and can form without a sharp pole. A bear flag follows a downward pole and studies a downward resolution.
Record a reproducible chart observation
A useful chart record includes the unsuccessful cases. Define your rules before collecting examples and retain the same price scale, adjustment basis and candle interval throughout the sample.
- Record the preceding swing direction, formation duration and each boundary touch.
- Write the exact close-based confirmation and the opposite boundary or swing that invalidates it.
- Compare event volume with its named denominator, and review both resolving and failed drawings.
- Check whether a scheduled event, such as an earnings report, falls inside the window you are studying; using earnings dates in research covers where such dates come from.
- Inspect the same stock on the Symbol Analysis guide, then record your observations in a trading journal.
These guides teach manual chart interpretation. A near-high or range screen lists candidates to inspect; it does not identify this formation.
Continue with
- Support, resistance and trendlinesHow horizontal levels and sloping lines are drawn and tested.
- Breakouts and pullbacksWhat a close beyond a level shows, and how retests are read.
- Put stock volume in contextCompare a session’s volume with the same stock’s usual activity.
- Candlestick patternsSingle- and multi-session candle shapes read alongside chart patterns.
- Stop-loss and profit targetsWhere invalidation levels and objectives fit in a written plan.
Sources
Read our data and methodology notes for calculation context. This guide explains research tools and observations. It does not recommend a trade or investment.