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A bull flag is a bullish continuation pattern made of two parts — a pole, which is a sharp near-vertical advance, and a flag, which is a shallow orderly pullback against it — and it confirms when price closes above the flag's upper boundary.
By Rohit Singh (Mr. Chartist) · Updated 2026-08-25
A bull flag is a stock pausing, not turning. Price advances hard and fast — the pole — and then instead of collapsing back it drifts sideways or slightly lower in a tight, orderly band, the flag. Buyers who chased the advance are taking a breather; sellers are not showing up in size. The pattern is a bet that the pause resolves in the direction of the move that preceded it.
The two components have to be read separately because they carry different information. The pole tells you how much demand arrived and how quickly, and it is the pole that sets the target. The flag tells you what happened to that demand afterwards — whether it was profit-taking of a normal size or the start of a genuine unwind. A flag that is shallow, tight and short is a pause. A flag that retraces most of the pole is a failure wearing the same shape.
ChartBook editions label this structure 'Pole & Flag', which is a more useful name than 'bull flag' because it forces you to identify both parts before calling the pattern. Nothing here is tradeable until price closes back above the flag's upper boundary — until then it is a stock that went up and has stopped going up, which happens for reasons that have nothing to do with continuation.
Measure the height of the pole — from the base where the sharp advance began to the high where it ended — and project that same distance upward from the flag's breakout point. That is the measured move, and it is the pattern's own first objective rather than a price forecast. Because the projection is anchored to the pole, a flag that has drifted a long way down produces a lower launch point and therefore a lower target from the identical pole.
Aditya Vision, published in ChartBook 280: the flag's upper boundary sat at ₹560, which was also the breakout confirmation level, and the edition published ₹740–₹760 explicitly as the 'target zone from flagpole height'. Projected from the ₹560 breakout, that zone implies a pole of roughly ₹180–₹200 — and it sits as the middle rung of the published ladder of ₹650 → ₹740 → ₹850, with ₹650 an interim level and ₹850 an objective beyond the measured move.
The pole is the only part of the pattern that contains information about demand. A near-vertical advance on heavy volume means buyers were willing to pay progressively higher prices without waiting for pullbacks — that is an imbalance, and imbalances tend to have a second act. The flag contains no such information; it is simply what a market does after an imbalance while it decides whether more supply will appear.
This is why the target is measured from the pole and not from the flag. The flag's width tells you where risk sits, and its depth tells you whether the pattern is still alive, but neither says anything about how far the resolution can travel. The pole does, because it is the only measurement of how much buying pressure was actually present.
It also explains the most common misdiagnosis. Traders find a tidy little sideways band on a chart, call it a flag, and project a target — but there is no pole behind it, only a slow drift higher. Without a sharp advance to measure, there is nothing to project, and the tidy band is a range that will break in whichever direction the next imbalance arrives.
The practical test is blunt: if you cannot point at the pole and say where it started and where it ended, you do not have a bull flag.
The temptation with a flag is to buy inside it. The pattern looks obvious, the drift is quiet, and entering early gives a better price than waiting for the breakout. It also means buying a stock that is currently going down, on the assumption that it will stop — which is exactly the assumption the flag has not yet proved.
Aditya Vision in ChartBook 280 shows the disciplined alternative. The stock was marked at ₹573.50 with the flag's upper boundary at ₹560, and the edition still made the entry conditional: on a weekly close above ₹560–₹570. Price being above the line intraweek was not treated as the same thing as the week closing above it. The stop was published below ₹510 — under the flag, not under the pole — because if the flag's floor gives way the reason for the trade has gone, whatever the pole did earlier.
That structure also fixes the risk before the trade exists. Entry near ₹565 with a stop below ₹510 defines the loss in advance and lets the ₹740–₹760 flagpole-height zone be judged as a reward against a known risk rather than as a hope.
The cost of waiting for the close is a worse entry price than the trader who bought inside the flag. The benefit is that you never find out what happens when a flag that looked perfect keeps going down.
Each setup below was published in a ChartBook edition on the date shown, at the price it was marked at — entry, stop and target exactly as they went out. Nothing here is back-fitted, and the edition each came from is linked so you can check it.
ADITYAVISION · Weekly chart · 2.7 years to form
A pole and flag continuation breakout in progress, with ₹560 the flag's upper boundary and the breakout confirmation level — critical.
A pennant converges into a small symmetrical triangle after the pole — its boundaries close in on each other. A bull flag's boundaries stay roughly parallel as it drifts. Both follow a pole and both are continuation patterns, but the pennant is a squeeze while the flag is a channel.
A rectangle is a long sideways range with repeated touches of a flat floor and a flat ceiling, and it does not require anything to have happened before it. A bull flag is a brief counter-trend drift that only exists because of the sharp advance immediately preceding it.
A falling wedge converges — the upper boundary falls faster than the lower — and it is a reversal pattern that forms at the end of a decline. A bull flag has parallel boundaries and is a continuation pattern that forms in the middle of an advance.
Screeners detect consequences, not shapes — nothing can scan for 'a pole with a flag on it'. Scan for the two conditions separately: a large percentage gain over a short recent window on volume well above the preceding average, which approximates the pole, followed by a contained pullback where the recent range has narrowed and volume has fallen, which approximates the flag. Then add the trigger — a close above the highest high of the pullback. On Chartink-style tools that is three stacked conditions rather than a pattern filter, and the output is a candidate list; whether the boundaries are actually parallel and the flag actually shallow still has to be confirmed on the chart.
A bull flag's reliability lives in the quality of the pole and the discipline of the flag, and both are judged by eye rather than by formula. A steep, high-volume pole followed by a tight, quiet, shallow drift that breaks out on expanding volume is a strong structure; a modest advance followed by a deep, messy, drawn-out pullback is a chart that merely resembles one. Win-rate percentages for flags circulate widely online and almost none disclose their sample, market or timeframe, so no figure is quoted here. The most useful reliability check is simply the depth of the flag relative to the pole — shallow flags behave very differently from deep ones.
Measure the height of the pole, from where the sharp advance began to where it ended, and project that same distance up from the flag's breakout point. In ChartBook 280, Aditya Vision's flag boundary and breakout level sat at ₹560, and the edition published ₹740–₹760 as the target zone derived from flagpole height.
A close above the flag's upper boundary, on the timeframe the pattern was drawn on, with volume expanding on that close. Aditya Vision's published entry required a weekly close above ₹560–₹570 — trading above the line during the week was not treated as confirmation.
Yes. 'Pole & Flag' is how ChartBook editions label the pattern, and it is arguably the better name because it names both components. The pole is the sharp advance and the flag is the shallow pullback against it.
The shape of the pause. A flag's two boundaries run roughly parallel as price drifts. A pennant's boundaries converge into a small triangle. Both follow a pole and both resolve in the direction of the pole, but they are drawn differently and a converging pause should be called a pennant.
Shallow is the whole point. A drift of a modest fraction of the pole is normal; a pullback of more than roughly half the pole is a warning, and one that reaches into the lower third of the pole means the advance is being unwound rather than digested. At that depth the pattern is failed, not paused, and the pole-height target no longer applies.
Short relative to the pole. The pause should look like a breather beside the advance that created it, not a competing structure. When the drift stretches to many times the duration of the pole it has become a sideways range, which breaks on its own terms rather than on the pole's target.
It depends on the pole's steepness and volume, the flag's depth and tidiness, and whether the breakout carried volume expansion — far more than on any averaged statistic. Widely circulated win-rate figures for flags rarely disclose their sample, market or timeframe, so they should not be relied on. Judge the individual structure.
Written By
Mr. Chartist
With 14+ years of experience in Indian financial markets, Rohit Singh (Mr. Chartist) is a SEBI Registered Research Analyst, Amazon #1 bestselling author, and the founder of Investology — a premium trading ecosystem trusted by a 1.5 Lakh+ strong community across India.
Educational content only. This page explains a chart pattern and cites setups previously published in the Weekend ChartBook; it is not investment advice and not a recommendation to buy or sell any security. Registration granted by SEBI, membership of BASL and certification from NISM in no way guarantee performance or assure returns. Markets carry risk — read all related documents carefully before investing.