S&P 500 Heatmap
The S&P 500 is the benchmark for US stocks — 500 of the largest listed companies. This live heatmap shows all of them at once: green for gainers, red for losers, each tile sized by market cap and grouped by sector, so you can see exactly what is moving the index (and ETFs like SPY) today.
Free, real-time and color-coded — no sign-up, no paywall.
How to read a heatmap
A heatmap turns an entire market into a single, color-coded picture so you can see what is moving at a glance — no scrolling through hundreds of tickers.
- Color = performance. Green tiles are up on the day and red tiles are down. The deeper the shade, the bigger the move — a sea of green means a broad rally, a wall of red means a sell-off.
- Tile size = weight. Bigger tiles are bigger companies by market capitalization (or heavier index weight). Mega-caps dominate the map, while smaller names sit in the corners.
- Grouped by sector. Tiles are clustered into sectors — technology, financials, energy and so on — so you can instantly tell whether a move is broad-based or driven by one corner of the market.
- Tap any tile to drill in and switch the time frame from today's move to weekly, monthly or year-to-date performance.
Prices update as the market moves and the colors shift with them. Data may be delayed depending on the exchange.
What is the S&P 500 heatmap?
The S&P 500 heatmap is a single-screen map of the S&P 500 index. Every constituent is a rectangle whose color reflects its performance and whose size reflects its market capitalization. Because the index is market-cap weighted, the largest tiles — Apple, Microsoft, Nvidia, Amazon and the other mega-caps — carry the most influence over where the index goes.
Group the tiles by the eleven GICS sectors (technology, financials, health care, energy and the rest) and you can instantly see whether a move is broad-based or concentrated in a handful of giants.
How the S&P 500 heatmap tracks SPY
ETFs such as SPY, VOO and IVV simply hold the S&P 500 in proportion to each company’s weight, so this heatmap is effectively a live picture of what those funds are doing. When the mega-cap tiles are green, SPY tends to be green; when they turn red, the whole index feels it — even if most smaller tiles are flat.
To go further on any single name, open the stock-vs-stock comparison or the investment time machine.
Frequently asked questions
What is an S&P 500 heatmap?
It is a visual map of the S&P 500 index where each of the 500 companies is a colored tile. Green means the stock is up, red means down, and tile size reflects market capitalization. It lets you see what is driving the index in one glance.
Does the S&P 500 heatmap track SPY?
Effectively, yes. SPY and other S&P 500 ETFs hold the same companies in the same market-cap weights, so the heatmap mirrors what SPY is doing. When the largest tiles are green, SPY tends to rise; when they are red, it tends to fall.
Is the S&P 500 heatmap free and live?
Yes. It is free with no sign-up and updates in real time as the market trades, though data may be delayed depending on the exchange.
Why do a few companies dominate the map?
The S&P 500 is market-cap weighted, so the biggest companies get the biggest tiles and the most influence over the index. A handful of mega-cap technology names can move the whole index even when most other tiles barely change.
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Not investment advice. For informational purposes only; not a buy/sell recommendation. Past performance is not indicative of future results. Data may be delayed.