The price-to-earnings (P/E) ratio divides a company's share price by its trailing twelve-month earnings per share — the market's price tag for each dollar of profit. On this heatmap, every tile is a US-listed company sized by market cap and colored by its P/E ratio, so whole sectors can be compared for expensiveness in a single view.
Greener tiles have lower (cheaper) P/E ratios, redder tiles have higher (more expensive) ratios, and gray tiles are loss-makers with no meaningful P/E.
There is no universal "good" P/E — the US market average is roughly 20–25. Value investors often screen for P/E below 15, while high-growth sectors like software regularly trade above 30. The heatmap makes sector-relative comparison easy: a P/E of 20 is cheap for tech but expensive for utilities.
Gray tiles are companies with negative or near-zero earnings — a P/E cannot be computed when EPS is negative. These firms may still be expensive or cheap on other metrics like P/S or EV/EBITDA.
No — a low P/E can signal a value trap: earnings collapsing, cyclical peaks, or structural decline. Combine the P/E heatmap with the Piotroski F-score or Altman Z-score views to filter cheap companies that are also financially healthy.
Heatmap data updates through the trading session. Fundamentals come from Finnhub and SEC filings; scores are simplified heuristics for screening — not investment advice.