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The Dow Jones Industrial Average (NYSE: DJI, also called the DJIA, Dow 30, or informally the Dow Jones or The Dow) is one of several stock market indices created by nineteenth century Wall Street Journal editor and Dow Jones & Company co-founder Charles Dow. Dow compiled the index as a way to gauge the performance of the industrial component of America's stock markets. It is the oldest continuing U.S. market index, aside from the Dow Jones Transportation Average, which Dow also created.
Today, the average consists of 30 of the largest and most widely held public companies in the United States. The "industrial" portion of the name is largely historical—many of the 30 modern components have little to do with heavy industry. To compensate for the effects of stock splits and other adjustments, it is currently a scaled average, not the actual average of the prices of its component stocks—the sum of the component prices is divided by a divisor, which changes over time, to generate the value of the index.
The S&P 500 is an index containing the stocks of 500 Large-Cap corporations, most of which are American. The index is the most notable of the many indices owned and maintained by Standard & Poor's, a division of McGraw-Hill. S&P 500 is used in reference not only to the index but also to the 500 actual companies whose stocks are included in the index.
The S&P 500 index forms part of the broader S&P 1500 and S&P Global 1200 stock market indices.
All of the stocks in the index are those of large publicly held companies and trade on the two largest US stock markets, the New York Stock Exchange and Nasdaq. After the Dow Jones Industrial Average, the S&P 500 is the most widely watched index of large-cap US stocks. It is considered to be a bellwether for the US economy and is a component of the Index of Leading Indicators. It is often quoted using the symbol SPX or INX, and may be prefixed with a caret (^) or with a dollar sign ($).
Many index funds and exchange-traded funds track the performance of the S&P 500 by holding the same stocks as the index, in the same proportions, and thus attempting to match its performance (before fees and expenses). Partly because of this, a company which has its stock added to the list may see a boost in its stock price as the managers of the mutual funds must purchase that company's stock in order to match the funds' composition to that of the S&P 500 index.
In stock and mutual fund performance charts, the S&P 500 index is often used as a baseline for comparison. The chart will show the S&P 500 index, with the performance of the target stock or fund overlaid.
The Nasdaq Composite is a stock market index of all of the common stocks and similar securities (e.g. ADRs, tracking stocks, limited partnership interests) listed on the NASDAQ stock market, meaning that it has over 3,000 components. It is highly followed in the U.S. as an indicator of the performance of stocks of technology companies and growth companies. Since both U.S. and non-U.S. companies are listed on the NASDAQ stock market, the index is not an exclusively U.S. index.