← Browse all charts Chart intent Is cumulative participation still backing the index move?
Methodology: Current constituents, not point-in-time membership. History starts 2019-05-13 and can carry survivorship or constituent-change bias.
Market Signal
S&P 500 Advance / Decline Line
This chart shows whether participation beneath the index is broadening, narrowing, or starting to diverge from the headline move.
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The latest series values are listed below the chart. Visible-window CSV and full-history JSON downloads are available above.
Historical Context
Toggle the market-event markers above when you want to line recent regime shifts up with the signal.
How To Read It
- Rising breadth means more stocks are participating; falling breadth means leadership is narrowing.
- If the index is strong while breadth weakens, concentration is likely doing more of the work.
- Extremes matter most when they reverse, because that is when internals begin to confirm or reject the headline move.
Next step Want the longer read behind this chart?
ChartVault keeps the chart free and focused. The broader interpretation and setups continue in the publications below.