About: SandP 500, NASDAQ

S&P 500


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 ($).

For more:
http://en.wikipedia.org/wiki/S%26P_500
List of companies in the S&P 500

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NASDAQ

The NASDAQ (acronym of National Association of Securities Dealers Automated Quotations) is an American stock market. It is the largest electronic screen-based equity securities trading market in the United States. With approximately 3,200 companies, it lists more companies and on average trades more shares per day than any other U.S. market.[1]
It was founded in 1971 by the National Association of Securities Dealers (NASD), who divested themselves of it in a series of sales in 2000 and 2001. It is owned and operated by The NASDAQ Stock Market, the stock of which was listed on its own stock exchange in 2002, and is monitored by the Securities and Exchange Commission (SEC).

For more :

http://en.wikipedia.org/wiki/NASDAQ
NASDAQ Composite
NASDAQ-100




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