12 June 2013

What is an Index in Stock Market?

An index is an indicator of how the stock market is doing on the whole. An index comprises a basket of stocks. The collective value of these stocks on a given date is taken and given a score of 100. From that day onwards, the value of these stocks is tracked and its score relative to 100 is computed.

The stocks selected are based upon a number of parameters that the creators of the index decide. Equally, the valuation is also done using complex mathematical principles. Periodically, the list of shares used for computing the index also undergoes a change. These changes are decided by the index creators based on the parameters they have set for the stocks for inclusion.

An index shows whether the stock market, on the whole, is appreciating in value or declining in value.

The movement of the index itself is no indicator for individual shares. You may find that a particular share may be increasing in its price even when the index is down and vice versa. The index is only an indicator of the general trend.

The common indexes in Indian stock markets are:


        SENSEX, the index for stocks listed on the Bombay Stock Exchange 

        Nifty, the index for stocks listed on the National Stock Exchange.

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