Many finance and news websites provide the daily performance of key stock indexes in order to gauge overall market activity. For example, the Dow Jones Industrial Average, NASDAQ Composite Index, S&P 500 Index and Russell 2000 Index are among the summary data provided by MarketWatch for U.S. investors.Continue Reading
An index is a weighted aggregation of various stock prices used to help assess performance in certain market segments as well as the overall market, according to Investopedia. Major indexes such as the Dow Jones and S&P 500 are often considered by investors to be proxies for measuring the overall market's performance, as it is difficult in practice to aggregate the performance of every publicly traded stock. Information on major indexes is available through sites such as Bloomberg and Google Finance, which provide trading data including up-to-date prices, daily changes, historical graphs and 52-week price ranges.
Investors interested in certain shares also have the option of accessing real-time online stock quotes from sources such as NASDAQ and CNN. Additionally, sites such as MarketWatch provide market screeners, which allow users to sort stocks from each major exchange according to their daily activity based on factors such as price changes, number of trades executed and overall dollar value of trades.Learn more about Investing