Broadening Formation

The broadening formation, commonly called the megaphone pattern, stands out on a chart as an expanding series of price swings where each high is higher and each low is lower than the last. This reversal pattern reflects escalating conflict between buyers and sellers, with neither side able to maintain control. It appears most frequently near market tops on daily and weekly charts of large-cap US equities and indices, making it a valuable warning signal for traders monitoring trend exhaustion. The broadening formation rewards patient traders who respect its volatile nature and wait for confirmed setups.

How to Identify the Broadening Formation

1. Higher highs on the upper boundary — Price must make at least two progressively higher swing highs. Connect these points to form an ascending upper trendline. Each high should exceed the prior high by a meaningful amount, not just a few ticks.

2. Lower lows on the lower boundary — Price must also make at least two progressively lower swing lows. Connect these to form a descending lower trendline. The two trendlines should clearly diverge from left to right, creating the megaphone shape.

3. Minimum five touch points — A valid broadening formation requires at least five alternating touches across both trendlines, typically three on one side and two on the other. Fewer touches indicate the pattern is still developing and not yet tradeable.

4. Expanding volume on successive swings — Volume should increase as price reaches each new extreme. If volume contracts as swings widen, the pattern may lack the conviction to produce a reliable breakout. Compare each swing’s peak volume to the prior swing using a 20-bar volume average as a baseline.

5. Duration of 3-8 weeks on daily charts — The pattern needs time to establish the expanding range. Formations that complete in under two weeks on daily charts often lack the institutional participation that drives reliable breakdowns.

Entry Rules

1. Breakout short below the lower trendline — Wait for a daily close below the lower trendline with volume exceeding the 20-bar average by at least 1.5x. A close below the trendline on weak volume is a false signal — do not enter until volume confirms.

2. Swing trades within the pattern — Enter at trendline touches when a reversal candlestick appears (such as a hammer, shooting star, or engulfing pattern). This approach works best after the third or fourth touch when the trendlines are well established.

3. Five-point minimum before breakout trades — Do not trade the breakout until at least five alternating touch points confirm the pattern. Early breakout attempts before the pattern matures have a significantly higher failure rate.

Exit Rules & Targets

1. Breakout target using the measured move — Calculate the vertical distance between the upper and lower trendlines at the widest point of the formation. For a downside breakout, subtract this distance from the breakout price to set the primary target.

2. Swing trade exits at the opposite trendline — When trading inside the pattern, project the opposite trendline forward and exit before price reaches it. Take profit at 80-90% of the projected distance to account for early reversals.

3. Trailing stop after 1R — Once the trade moves one risk unit in your favor, move the stop to the most recent swing high (for shorts) or swing low (for longs) inside the formation.

4. Invalidation exit within 3 bars — If price closes back inside the pattern within three bars of the breakout, exit immediately. Re-entry signals are unreliable on broadening formations.

Target Calculation: Measure the vertical distance from the highest high to the lowest low within the formation at its widest point. For a downside breakout at $145, with the widest span measuring $18, the target is $145 - $18 = $127. For an upside breakout at $163, the target is $163 + $18 = $181.

Stop Loss Placement

For breakout trades below the lower trendline, place the stop above the last swing high inside the formation. This level represents the most recent point where buyers showed strength, and a move back above it invalidates the breakdown thesis. For swing trades within the pattern, set the stop 0.5-1 ATR beyond the most recent opposite swing to accommodate the expanding volatility. On a typical broadening formation with an $18 measured move and a $6 stop, the risk-to-reward ratio is 3:1, which provides a favorable edge even at the pattern’s moderate success rate.

Practical Example

On the daily chart of MSFT, price rallies from $410 to $432 over two weeks, then pulls back to $405. The next swing reaches $438, followed by a drop to $398. A third push hits $445 before price reverses. Drawing trendlines across the three highs ($432, $438, $445) and two lows ($405, $398) reveals a clear broadening formation. The widest span measures $47 ($445 - $398). Volume expands on each successive swing, confirming the pattern. Price breaks below the lower trendline at $394 on 1.8x average volume. With a stop at $410 (the last swing high) and a target of $347 ($394 - $47), the risk is $16 per share and the reward is $47 — a 2.9:1 ratio. On a $25,000 account risking 2% ($500), the position size is 31 shares ($500 / $16). Price reaches $352 in three weeks, and the trade is closed for a profit of approximately $1,302.

Best Timeframes for the Broadening Formation

The daily chart produces the most actionable broadening formations, with enough data points to validate the expanding trendlines and sufficient volume context. Weekly charts offer higher-conviction signals for position traders, though these formations develop over several months. The 4-hour timeframe works for active traders on large-cap stocks and ETFs like SPY, where intraday volume is deep enough to confirm swings. Intraday formations on the 5-minute or 15-minute charts are prone to noise and have lower success rates. The documented 55-60% reversal rate applies primarily to daily chart formations with volume confirmation — shorter timeframes should be traded with tighter risk management.

Common Mistakes

1. Trading before the pattern is confirmed — Entering after only two or three touch points leads to trading what may be random price expansion. Wait for five alternating touches before considering the formation valid.

2. Ignoring volume behavior — A broadening formation with declining volume on each swing is losing momentum and may not produce a clean breakout. Always compare swing volume to the 20-bar average to gauge conviction.

3. Predicting breakout direction — While broadening formations favor downside breakouts at market tops, assuming direction before it happens leads to premature positioning. Let price close beyond a trendline with volume confirmation before committing.

4. Setting stops too tight — The defining feature of this pattern is expanding volatility. Stops placed just beyond the nearest swing will get triggered by normal price action. Use the last major swing high or low plus an ATR buffer.

5. Confusing with a symmetrical triangle — Symmetrical triangles converge, broadening formations diverge. If your trendlines narrow from left to right, you are looking at a different pattern with different trading rules. Check that each successive swing makes a more extreme high or low than the last.

How to Journal Broadening Formation Trades

Journal Field	What to Record	Why It Matters
Pattern Type	Broadening formation / megaphone	Filter pattern-specific performance reviews
Touch Point Count	Number of trendline touches before entry	Determine your minimum threshold for valid setups
Volume Trend	Expanding, flat, or declining across swings	Validate which volume profiles produce the best outcomes
Entry Type	Breakout or swing within pattern	Compare win rates between the two approaches
Breakout Direction	Upside or downside	Track directional bias accuracy over time
Stop Distance (ATR)	Stop size relative to ATR	Optimize stop placement for this pattern’s volatility
Measured Move Achieved	Percentage of target reached	Assess whether full targets or partial exits work better

After journaling 50 or more broadening formation trades, patterns emerge in your data. You may find that five-touch setups outperform four-touch setups by a wide margin, or that your swing trades inside the pattern are more profitable than breakout entries. Use JournalPlus’s tagging system to filter by pattern type and compare metrics across market conditions — this data-driven review process transforms pattern trading from guesswork into a repeatable edge.