BSE 100

The S&P BSE 100 is a price-sensitive stock index designed to measure the performance of stocks of the top 100 most liquid companies listed on the Bombay Stock Exchange (BSE).

The stocks forming part of S&P BSE 100 belong to S&P BSE's Large to MidCap category. 

The BSE 100 index is calculated in Indian Rupees. The index consists of float-adjusted stocks (float-adjusted means considering only shares available for investors and not held by other companies or the government). The S&P BSE 100 index was launched in January 1989, but the base year for BSE 100 is taken as the financial year 1983-84, with a base value of 100 points.

The list of BSE 100 companies is revised semi-annually in December and June every year. The BSE 100 companies are selected based on the following criteria-

1. The constituent (i.e., company) should be a member of S&P BSE LargeMidCap
2. The selection is based on the free-float market cap
3. The weightage of the companies is based on the constituent's float-adjusted market capitalization
4. The company should have a minimum annualized traded value of greater than or equal to 10 billion. Here, annualizing means converting a value from a short-term calculation or rate to an annual rate.
5. The BSE 100 companies are selected based on their rankings. The list is obtained as a combination of their liquidity and market capitalization.

The S&P BSE 100 index was formerly called the BSE National Index. The index was launched in 1989. As per the 2021 data, the S&P BSE 100 index covers over 60% of the market capitalization out of the total market cap of listed companies on BSE. In the year 1999, the BSE 100 index became the S&P BSE 100 index. The S&P BSE 100 index tracks the stock performance of the top 100 companies listed on BSE. As of the year 2021, the S&P BSE 100 index reflects almost two-thirds of the market capitalization out of the total market cap of BSE. The computation methodology of the S&P BSE 100 index also shifted with time. The free-float method was adopted with effect from 5^th April 2004.

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