One-month performance tracks the medium-term trend — long enough to filter daily noise, short enough to catch active rotations. This heatmap colors US stocks by ~1-month return, sized by market cap and grouped by sector.
Greener tiles lead the month, redder tiles lag — persistent sector trends stand out as color blocks.
Academic momentum research centers on 1–12 month windows — a month is the shortest period where trends are statistically meaningful rather than noise.
Company-specific strength — something (earnings beat, contract win, upgrade) is fighting the sector tide. Divergence in either direction is usually the interesting tile.
Weakly — intermediate momentum has a documented edge, but it reverses at turning points and gets crowded. Use it as context, not a signal.
Heatmap data updates through the trading session. Fundamentals come from Finnhub and SEC filings; scores are simplified heuristics for screening — not investment advice.