Relative volume compares today's trading volume to the stock's own average — RVOL of 2 means twice the normal pace, usually with news, earnings or a catalyst behind it. Day traders live on this metric: unusual volume marks where attention and liquidity actually are. This heatmap colors US stocks by RVOL, sized by market cap and grouped by sector.
Greener tiles trade far above their normal volume, redder tiles below it — green marks catalysts, red marks quiet drift.
Day traders typically watch RVOL above 1.5–2 — the stock is doing multiples of its normal business. Above 3 usually means a real catalyst: earnings, guidance, an FDA decision or a short squeeze.
Not necessarily — volume confirms attention, not direction. RVOL combined with the day-change view shows whether the unusual flow is buying or selling.
A mega-cap doing 50M shares can be a normal Tuesday; a small-cap doing 2M can be 10× its average. RVOL normalizes each stock against itself, surfacing the genuinely abnormal.
Heatmap data updates through the trading session. Fundamentals come from Finnhub and SEC filings; scores are simplified heuristics for screening — not investment advice.