Stock market heatmap

Up to 500 companies, the largest by market cap, on one map, grouped by sector, each tile sized by its market cap and coloured by its move. Point at a tile for its figures; every tile opens its company.

The market by sector

Companies by market cap, coloured by their move

−3%+3%

A tile's size is its market cap · Closing prices of 23 Oct 2026

Every company in each sector

All the shares that traded, not only the largest: sectors with the largest share rising first

About the heatmap

How do I read the heatmap?

Each tile is a company, inside the block of its sector. Its area is its market cap, so the largest companies take the most room, and its colour is its move over the window chosen: green for a rise, red for a fall, deeper the larger the move. A grey tile barely moved.

Which companies are on it?

The largest companies by market cap that traded on the latest day: 100, 250 or 500 of them. Smaller companies would be tiles too small to read.

What does the depth of colour mean?

Each window has its own scale, shown under the map: today's moves are read against 3%, a month's against 10%, three months' against 20% and a year's against 40%. A move at or past the scale takes the deepest colour.

When is it updated?

Every quarter hour while the market is open, with each company's latest price, and again with the closing prices after the session.