S&P 500 Heatmap
A live stock market map of the S&P 500: every company in the index grouped by sector, sized by market cap and colored by today's price change. Green tiles are up, red tiles are down, and the deeper the color the bigger the move. Hover a tile for the price, change and market cap, or click it to open the stock page.
Quotes may be delayed. See also the full S&P 500 components list and the stock screener.
S&P 500 sectors today
Sector change is weighted by market cap. Sectors are listed from largest to smallest.
About the S&P 500 heatmap
The S&P 500 heatmap turns the whole index into one picture. Each rectangle is a company: its area is proportional to the company's market capitalization and its color shows today's percentage change in the stock price. Companies are grouped into eleven sectors, from Technology and Financial Services to Utilities and Basic Materials, and each sector heading shows the sector's market-cap-weighted change for the day.
Because the S&P 500 is weighted by market value, a handful of very large companies drive much of its daily move. The heatmap makes this visible: when the biggest technology tiles turn red, the index usually falls even if most of the smaller tiles are green. It also shows rotation between sectors, for example money moving out of technology and into defensive sectors such as utilities, consumer defensive or healthcare.
How to use it:
- Look at the sector headings first to see which parts of the market lead and which lag.
- Check the largest tiles: their moves explain most of the index's change.
- Spot outliers: a deep red or deep green tile in a calm sector often means company news such as earnings, guidance or an analyst rating change.
- Click any tile to open the stock's page with its quote, chart, financials, analyst ratings and news.
What is the S&P 500?
The S&P 500 is a stock market index of about 500 of the largest US companies listed on the NYSE and NASDAQ. Maintained by S&P Dow Jones Indices, it is the most widely followed benchmark for the US stock market and covers roughly 80% of the market value of US-listed stocks. Many index funds and ETFs track it, including SPDR S&P 500 ETF Trust (SPY), iShares Core S&P 500 ETF (IVV) and Vanguard S&P 500 ETF (VOO).
A committee chooses the members. To be added, a company must be based in the US, meet a minimum market capitalization, have enough of its shares available to the public and trade actively, and have positive earnings over the most recent four quarters combined. Members are weighted by float-adjusted market capitalization, and the index is rebalanced every quarter. Companies that shrink, are acquired or no longer meet the rules are replaced.
For a sortable table of all members with prices, market cap and P/E ratios, see the S&P 500 components list. Other indices: Dow Jones 30, Nasdaq 100, S&P MidCap 400, S&P SmallCap 600 and Russell 2000.
S&P 500 heatmap FAQ
What is an S&P 500 heatmap?
An S&P 500 heatmap is a chart that shows every company in the S&P 500 index as a colored rectangle. The size of each rectangle reflects the company's market capitalization and the color shows how much its stock price has changed today: green for gains, red for losses, and deeper shades for bigger moves. Companies are grouped by sector, so you can see at a glance which parts of the market are rising or falling.
How do I read the heatmap?
Bigger tiles are bigger companies, so a move in Apple, NVIDIA or Microsoft matters more to the index than a move in a small tile. Read the color scale at the bottom of the map: gray means little or no change, light shades mean moves of less than 1%, medium shades 1–2%, and the deepest shades 2% or more. The percentage next to each sector name is the market-cap-weighted change of that sector's stocks.
How often does the heatmap update?
The heatmap loads the latest quotes each time you open or reload the page. During the trading session prices may be delayed by about 15–20 minutes; after the market closes the map shows each stock's closing price and its change for the day.
Why are the sectors different from GICS sectors?
The S&P 500 itself uses the GICS classification (for example Information Technology, Health Care, Consumer Discretionary and Consumer Staples). This heatmap groups companies by the sector classification used across Quotelinks (Technology, Healthcare, Consumer Cyclical, Consumer Defensive and so on), so a few companies sit in a different group than in GICS. Automatic Data Processing (ADP), for example, is an Industrials company under GICS but appears under Technology here.
Why does Alphabet have only one tile?
Some companies have more than one share class in the index, such as Alphabet (GOOGL and GOOG), Fox (FOXA and FOX) and News Corp (NWSA and NWS). The heatmap shows each company once, under its most traded share class, so the company is not counted twice.
Is the tile size the same as the index weight?
Not exactly. Tiles are sized by each company's total market capitalization. The S&P 500 weights its members by float-adjusted market capitalization, which counts only shares available to the public, so a company with a large insider or government stake has a slightly smaller weight in the index than its tile suggests.
How many companies are in the S&P 500?
The index tracks 500 companies, but it holds a few more than 500 stocks because some companies are included with two share classes. Membership is decided by a committee at S&P Dow Jones Indices and changes several times a year as companies are added or removed.