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Advance-Decline Line

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Advance-Decline Line — Market Breadth Indicator
The NYSE Advance-Decline Line measures the internal health of the broad market by tracking how many stocks are actually participating in any given move — not just the mega-caps driving the index.
Every session the NYSE reports how many stocks closed up (advances) vs. down (declines). This indicator plots the raw daily difference as a histogram and applies two EMAs to identify the underlying breadth trend, cutting through daily noise to reveal the true market regime.
Why price alone isn't enough
The S&P 500 is market-cap weighted. Apple, Microsoft, and Nvidia can hold the index up while the other 490 stocks quietly deteriorate. The A/D Line weights every stock equally — exposing that divergence immediately. The classic example: the NYSE A/D Line peaked nearly two years before the Nasdaq crashed in 2000, giving attentive traders ample warning.
Background color — the regime signal
🟢 Green — Fast EMA > Slow EMA AND Slow EMA > 0. Broad market breadth is healthy. Favorable conditions for long positions.
🟠 Orange — Mixed signals. One condition is met but not both. Breadth is transitioning — proceed with caution.
🔴 Red — Fast EMA < Slow EMA AND Slow EMA < 0. Breadth is weak across most stocks. Historically, breakouts fail at a much higher rate in this regime.
Histogram bars
Each bar shows the raw daily breadth pulse — teal when more stocks advanced, red when more declined. Individual bars provide context; the background color reflects the dominant trend via the two EMAs.
Settings

Fast EMA (default 50)
Slow EMA (default 200) — moves slowly, only reverses during genuine regime shifts

Alerts

Breadth Turning Bullish — Fast EMA crossed above Slow EMA
Breadth Turning Bearish — Fast EMA crossed below Slow EMA
Slow EMA Above Zero — breadth trend fully positive
Slow EMA Below Zero — breadth trend fully negative

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