US Stock Market Heatmap — Sector Treemap by Market Cap
A treemap of tracked US stocks: tile size = market cap (delayed IEX price × latest reported shares), color = day change, grouped by sector (derived from the Select Sector SPDR funds’ SEC N-PORT holdings — not official GICS). Delayed data, not investment advice.
Sector performance today(SPDR sector ETF proxies)
Technology
XLK · ETF proxy
Financials
XLF · ETF proxy
Health Care
XLV · ETF proxy
Consumer Discretionary
XLY · ETF proxy
Consumer Staples
XLP · ETF proxy
Energy
XLE · ETF proxy
Industrials
XLI · ETF proxy
Materials
XLB · ETF proxy
Real Estate
XLRE · ETF proxy
Utilities
XLU · ETF proxy
Communication Services
XLC · ETF proxy
Sector grouping comes from the 11 Select Sector SPDR funds’ latest SEC N-PORT holdings (fund-derived, not the official GICS classification; unmapped names fall to “Other”). Market cap = delayed IEX price × latest reported shares outstanding (a row is omitted when either is unknown). Delayed data · not investment advice. · Built 9/1/2026, 7:14:30 AM ET
Sources: delayed IEX prices · SEC XBRL share counts · Select Sector SPDR fund N-PORT holdings · not investment advice