Bull Flag
Key Takeaways
- 01.A rapid, high-volume upward advance (the flagpole).
- 02.A tight, downward-sloping correction channel with lower volume (the flag).
- 03.An upward breakout above the flag channel boundary on increased volume confirms continuation.
- 04.The measured move target is equal to the length of the flagpole projected up from the breakout.
Why it matters
It represents a brief pause in a powerful trend where buyers take profits and new buyers accumulate shares. Because the consolidation is tight, it offers low-risk entry points with a stop-loss placed just below the flag's lowest boundary.
When it matters
It matters most in strong momentum markets or immediately following positive earnings catalysts where a stock enters price discovery.
A steep upward price pole followed by a downward-sloping parallel channel that breaks out to the upside.
Draw parallel channel lines over the consolidation to define the flag boundaries.
Common Mistakes
Confusing a deep retracement with a flag
A true flag must be tight. If the retracement wipes out more than 50% of the flagpole's height, the structure is a deep pull-back or a reversal, not a high-probability flag.
Trading flags in low-volume stocks
Flags require high-momentum, institutional volume on the flagpole. In illiquid stocks, flags are unreliable and prone to sudden slippage.
📖 Real-World Example: Catalyst-driven momentum run
Following an outstanding earnings report, a SaaS stock surged 25% in three days (flagpole). It then drifted lower for five days in a tight 5% channel on declining volume. On the sixth day, a breakout above the channel on volume 1.5x the average initiated another leg up matching the flagpole's length.