Stock market index
S&P 500
What it measures
About 500 of the largest US companies, weighted by market value, so the biggest companies move it most. It is run by S&P Dow Jones Indices and is the most widely used measure of the US stock market.
Because it is weighted by size, a handful of technology companies now account for a large share of its movements.
Other markets
Charts and live prices are delayed, from TradingView. Market values use each company’s last trade on IEX at the previous close, times the shares in issue from its filings; company figures come from SEC filings. This is information, not investment advice. Where our market data comes from
Company logos are trademarks of their owners, shown only to identify them; the files are from Wikimedia Commons.
Data provided for free by IEX. By accessing or using IEX Historical Data, you agree to the IEX Historical Data Terms of Use.