What is a Pennant? Definition, Formula, and Example
A pennant is a short-term continuation pattern formed when price consolidates inside a small symmetrical triangle after a sharp directional move, then breaks out in the same direction as the prior trend.
Plain-English Definition
A pennant is a brief consolidation that appears immediately after a steep, near-vertical price move. The prior move is the "flagpole"; the consolidation is the "pennant" — two converging trendlines forming a tight symmetrical triangle. Pennants resolve in the direction of the flagpole and typically take 5–15 sessions to complete. Bullish pennants follow rallies; bearish pennants follow drops. Unlike larger triangle patterns, the pennant's defining feature is the explosive move that precedes it.
How It's Identified
Five conditions define a valid pennant:
1. Flagpole — a sharp, near-vertical price move of at least 15%–30% over 3–10 sessions, ideally on a catalyst or volume thrust.
2. Converging trendlines — both upper resistance and lower support tilt toward each other (unlike a flag, which has parallel lines).
3. Duration — 5–15 sessions. Longer than 20 sessions disqualifies the pattern.
4. Volume contraction — daily volume should decline meaningfully through the pennant, often to half of flagpole levels.
5. Breakout — a close beyond the resistance trendline on volume ≥ 150% of the pennant's average.
Measured target: add (or subtract) the flagpole length to the breakout point.
Target = Breakout Price + (Flagpole Top − Flagpole Bottom)
Worked Example
NVDA produced a textbook bull pennant in February 2024 following its Q4 earnings blowout. The flagpole ran from $660.49 on Feb 16 to $823.94 on Feb 23 — a $163 move (+24.7%) in five sessions on 4× average volume.
From Feb 26 through Mar 7, the stock consolidated between converging lines: resistance descending from $823 to roughly $810, support rising from $760 to $800. Daily volume contracted from 90M shares to 35M.
On Mar 8 NVDA closed at $875.28 on 80M shares — breakout confirmed. The flagpole-projected target of $968 ($805 breakout + $163 flagpole) was hit on Mar 25 when the stock printed $974.
When Traders Use It
- Momentum traders enter the breakout with a tight stop just below the pennant's low (or high for bear pennants). Risk/reward is favorable because the stop is small relative to the projected target.
- Trend-followers treat the pattern as a "second-chance" entry into a trend they missed at the start of the flagpole.
- Algorithmic systems scan for tight consolidations following volatility spikes — pennants quantify as periods where realized volatility drops below 50% of the prior 10-day average.
Best in strong, broad trending markets — single-stock pennants inside choppy indices have lower hit rates.
Limitations and Common Misconceptions
Pennants are routinely confused with bull flags. The distinction is geometric: flags have parallel trendlines, pennants converge. The trading implications are similar but pennants resolve faster.
Other limitations:
- Failed pennants reverse hard. When a bull pennant breaks below the lower support trendline, the failure trade often produces moves equal to the flagpole in the opposite direction.
- No flagpole, no pennant. A converging triangle without a preceding sharp move is just a small symmetrical triangle with much lower predictive power.
- Volume matters. A pennant on rising volume is unreliable — institutional distribution often disguises itself as consolidation.
- Time decay. Beyond 20 sessions, the energy from the flagpole dissipates and breakouts lose follow-through.
Use pennants only when all five conditions are present. Pattern recognition without rules is just chart-watching.