The Broadening Formation (also called the Megaphone or Expanding Triangle) is the opposite of a converging triangle. Instead of range narrowing, price makes higher highs and lower lows โ€” the range expands with each swing. This reflects growing uncertainty, emotional trading, and institutional disagreement about value. It typically signals market instability and often precedes a significant reversal.

Megaphone Pattern Diagram

H1 H2 H3โ†‘ L1 L2 L3โ†“ Expanding volatility Higher Highs + Lower Lows = Growing Uncertainty

Why Megaphone Patterns Form

They typically appear when:

  • Market participants violently disagree about the correct price
  • High-frequency news flow creates rapid sentiment swings
  • Institutional algorithms fight each other โ€” buying tops and selling bottoms
  • Often seen near market tops โ€” the last phase of a bull market is often a megaphone

Trading the Megaphone

Range Trading Approach:
Short at the upper trendline (higher high), Target the lower trendline
Long at the lower trendline (lower low), Target the upper trendline
Stop Loss: Beyond the trendline (if price exceeds the expanding boundary)

Breakout Approach:
Wait for a close below the lower trendline โ†’ Short continuation
Wait for a close above the upper trendline โ†’ Long continuation
The breakout direction signals the resolution of the uncertainty

Megaphone on NSE Indices

NIFTY 50 and BANK NIFTY form Megaphone patterns during:

  • Election periods โ€” rapid sentiment swings on poll results
  • RBI monetary policy uncertainty periods
  • Global crisis periods (COVID-like events) when FII flows are volatile
The Megaphone is one of the most difficult patterns to trade because by definition the range keeps expanding โ€” stops are frequently hit before the trade works. Reduce position size significantly when trading within a Megaphone pattern. Use wider stops or wait for the breakout resolution.