One-week performance compares today's price to the close five trading sessions ago — the short-term momentum window where earnings reactions, sector rotations and macro moves play out. This heatmap colors US stocks by 1-week return, sized by market cap and grouped by sector.
Greener tiles are this week's winners, redder tiles its losers — sector-level rotations become visible instantly.
Sustained moves — a +3% day is noise, but a week of consecutive gains signals real demand or news flow. Weekly also smooths single-day overreactions.
Both ways: momentum followers buy the green expecting continuation, mean-reversion traders hunt the red expecting snap-back. The map shows where each crowd will look.
Macro rotation — rates, oil, risk appetite move sectors as a block. Sector-wide red with one green tile usually marks company-specific strength worth investigating.
Heatmap data updates through the trading session. Fundamentals come from Finnhub and SEC filings; scores are simplified heuristics for screening — not investment advice.