← Browse all charts Are unusual volume days spreading or isolated?
Methodology: Current constituents, not point-in-time membership. History starts 2019-04-16 and can carry survivorship or constituent-change bias.
S&P 500 Volume Spike Count
A breadth-volume chart showing how many current S&P 500 members are printing unusually heavy volume versus their own 20-day norm.
The deep history is for NASDUCK paid members.
This free chart covers the last twelve months. Everything older, plus the CSV and JSON downloads, comes with a paid NASDUCK subscription.
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The latest series values and a keyboard-readable date table are below the chart. CSV and JSON downloads are for NASDUCK paid members.
Dates & readable data
Selected historical events
Curated anchors for market context, rather than a complete news feed. Toggle markers above to place them on the chart.
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 This chart shows the market. Dig for Stocks picks the stocks.
Breadth and sector charts tell you the weather. They just can't tell you which stock to hold for the next 10 days - that's the whole job of the Dig for Stocks algorithm.