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The BSE 30 Sensex, first compiled in 1986 is a market capitalisation weighted index of 30 Scrips. It represents 30 large well-established and financially sound companies.
The actual stocks have changed over the years along with the Indian economy but in general the Sensex represents the stock prices of the largest and most important companies from a variety of sectors. It was the first index to be launched by any Stock Exchange in India and has acquired a unique place in the collective memory of investors. The Sensex represents a broad spectrum of companies in a variety of industries. | 
