BSE 100 index is called as BSE National Index as it works as broad-based index reflecting the stock market at national level. Initially Sense was compiled of only 30 most effective stocks of the market. Due to its limited effect, in 1989 BSE started BSE 100 index, compiled of 100 companies from “Specified” and the “Non-Specified” list of the five major stock exchanges, viz. Mumbai, Calcutta, Delhi, Ahmedabad and Madras. The financial year 1983-84 has been chosen as the base year because of the price stability during that year and its proximity to the index series.

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