Specialized Stock Indexes
The most regularly quoted market indices are those that include the stocks of the largest listed companies on a nation's largest stock exchange. Examples include the BSE 30, the CNX Nifty 50, and others. However, because of the concentration of a relatively few very large stocks, such indices can give a misleading picture of market trends. Therefore, there is need for more specialized indices for tracking the performance of specific sectors of the market - for instance, there are national indices for technological companies, banks or companies with having high brand recognition or value, or small companies indices.
Sector Indices can be classified on various parameters: they can be classified on the basis of industry, on the basis of capitalization (Large Cap Index/Mid Cap Index/ Small Cap Index), on the basis of ownership (BSE PSU Index), or composition of index published in newspapers like Economic Times, Businessline, etc