An index is a stock-market indicator created as a statistical measure of the performance of an entire market or segment of a market based on a sample of securities from the market. An index is thus a means to evaluate the overall performance of a market or of a segment of the market. An index measures the aggregate market movements.
Apart from being a general market indicator, indices are used as a benchmark to evaluate individual portfolio performance. Professional money managers will always try to outperform the market, i.e. they will always try to do better than the indices. For example, if the value of a portfolio moves up by 10% while the index moved up by only 5% then the portfolio is doing better than the market.
We have two renowned indices viz.
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BSE Sensitive Index (BSE SENSEX)
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S&P Nifty 50 (NIFTY)
BSE Sensex comprises of 30 large-cap companies. As the name suggests, it is a premier index on Bombay Stock Exchange (BSE). Nifty comprises of 50 large-cap companies on the National Stock Exchange (NSE).