A Stock Index is a basket of securities that include stocks of different industries and represents economic performance of a nation. A broad-based index represents the performance of a whole stock market and reflects investor sentiment about the state of the economy.For example, SENSEX (BSE Stock index) includes 30 stocks and NIFTY (NSE Stock index) includes 50 stocks of the topmost companies of various industries.
Popular Indexes – I have briefly described few of the most popular Indexes around the world, based on geography.
America
Nasdaq 100 – is a stock market index of 100 of the largest domestic and international companies listed on the NASDAQ stock exchange. It is a modified market value-weighted index, the companies weights in the index are based on their market capitalization. The Index does not contain financial companies, and includes companies incorporated outside the United States.
NYSE Composite - index is designed to measure the performance of all common stocks listed on the New York Stock Exchange. As of 2007, over 2,000 stocks are covered in the index, of which over 1,600 are from United States and over 360 are foreign listings. However foreign companies are very prevalent among the largest companies in the index: of the 100 companies in the index having the largest market capitalization (and thus the largest impact on the index), more than half (55) are non-U.S. issues. The index was originally given a value of 50 points, based on the market closing on December 31, 1965 The index is weighted using free-float market capitalization and calculated on both price and total return basis.
Dow Jones Industrial Average – (also called DJIA, Dow 30, Dow Jones , The Dow) is the most popular stock market index created by nineteenth century 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. 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.
S&P 500 - is a stock market index containing the stocks of 500 large-Cap companies, 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. 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.
IBovespa index – is a Brazilian index of about 50 stocks that are traded on the Sao Paulo Stock Exchange (BM&F Bovespa). Its index number represents the present value of a portfolio that begun in January 2, 1968, with a starting value of 100. The Exchange (Sao Paulo) is the third largest exchange in the world. It was formed by merger of Sao Paulo Stock Exchange (Bovespa) and the Brazilian Mercantile and Futures Exchange (BM&F) on May 8, 2008 , creating the new BM&F Bovespa.
Europe
FTSE 100 – is index of the 100 most highly capitalized companies listed on the London Stock Exchange. The index began on 3 January 1984 with a base level of 1000. The index is maintained by the FTSE Group, an independent company which originated as a joint venture between the Financial Times and the London Stock Exchange.
DAX 30 – is a stock market index consisting of the 30 major German companies trading on the Frankfurt Stock Exchange. It is a market capitalization-weighted average index. Futures and options contracts on the DAX 30 are listed on EUREX.
CAC 40 – is a benchmark French stock market index. The index represents a capitalization-weighted measure of the 40 most significant stocks among the 100 highest market caps on the Paris Bourse (now Euronext Paris). The CAC 40 is a market value-weighted index. Its base value was set to 1,000 on 31 December 1987.
Asia
Nikkei 225 – is a stock market index for the Tokyo Stock Exchange (TSE). The Nikkei average is the most watched index of Asian stocks. It has been calculated daily by the Nihon Keizai Shimbun (Nikkei) newspaper since 1971. It is a price-weighted average, and the components are reviewed once a year.
KOSPI (Korea Composite Stock Price Index) – is the index of stocks traded on the Korea stock Exchange. It’s the representative stock market index of South Korea. KOSPI was introduced in 1983 with the base value of 100 as of January 4, 1980.
Hang Seng (HSI)- is a free float market capitalization-weighted stock market index of Hong Kong stock exchange. It is the main indicator of the overall market performance in Hong Kong. These 40 companies represent about 65% of capitalization of the Hong Kong Stock Exchange. HSI was started on November 24, 1969, and is currently compiled and maintained by HSI Services Limited, which is a wholly owned subsidiary of Hang Seng Bank.