Net margin is net income divided by revenue — the share of each sales dollar that survives as profit after every cost, interest payment and tax. This heatmap colors US stocks by trailing net margin, sized by market cap and grouped by sector, exposing which industries run wide moats and which fight on razor-thin margins.
Greener tiles keep more profit per revenue dollar, redder tiles less — loss-makers are deep red.
Highly sector-dependent: software and semiconductors run 20–30%+, retailers survive on 2–5%. There is no cross-sector "good" — only "good for the industry", which is why the map is sector-grouped.
Mostly, but one-off items (asset sales, tax credits) can inflate a single period. Watch for durable margins — a company at 25% for years has a moat; at 25% once had a windfall.
Depends on the thesis: high-margin compounders suit quality portfolios, low-margin high-growth names suit momentum. Toggle to the revenue-growth view to see the same map colored by the opposite trait.
Heatmap data updates through the trading session. Fundamentals come from Finnhub and SEC filings; scores are simplified heuristics for screening — not investment advice.