The S&P BSE SENSEX (S&P Bombay Stock Exchange Sensitive Index), also-called the BSE 30 or simply the SENSEX, is a free-float market capitalisation-weighted stock market index of 30 well-established and financially sound companies listed on BSE Ltd.. The 30 component companies which are some of the largest and most actively traded stocks, are representative of various industrial sectors of the Indian economy. Published since 1 January 1986, the S&P BSE SENSEX is regarded as the pulse of the domestic stock markets in India. The base value of the S&P BSE SENSEX is taken as 100 on 1 April 1979, and its base year as 1978–79. On 25 July 2001 BSE launched DOLLEX-30, a dollar-linked version of S&P BSE SENSEX. As of 21 April 2011, the market capitalisation of S&P BSE SENSEX was about 29733 billion (US$544 billion) (47.68% of market capitalisation of BSE), while its free-float market capitalisation was 15690 billion (US$287 billion).

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