
Sensex (SENSEX) live share price today at BSE
08 October, 2025 12:46 | BSE : -51

BSE Sensex: Brief Overview of the Index
The BSE Sensex is an Index which is used as an analytical tool to measure the performance of the top 30 largest and liquid stocks in the BSE LargeMidCap. The method used in valuing the BSE Sensex Index is based on float-adjusted market capitalisation. The BSE Sensex is used as a phrase similar to 'Sensitive' and 'Index'. The movement in the market is measured in this Index, which is listed on the Indian Stock Exchange.
The BSE Sensex index comprises the top 30 constituent stocks, representing liquid, sizable, and competitive companies. The BSE Sensex Index widely covers the electronic media in the markets of both domestic and foreign representatives. The method is primarily used for full market capitalisation, but later it changed and was used as a free-float capitalisation. The free-float market capitalisation method is considered the best method in the Sensex sector.
The BSE Sensex was launched on 3rd April,1979, with a base year of 1978 and a base value of 100. The BSE Sensex Index comprises the top-liquid stocks in the BSE Sensex and is considered the most traditional index in India, having been launched in 1979. The world was not as developed at that time, but the revolution of the BSE Sensex Index gained popularity due to its reliable data and trust among investors.
Key Aspects of the BSE Sensex 50
- The market capitalisation of the Index as a percentage of total market capitalisation is 43.51%
- The volume of the index as a percentage of the total market volume is 1.36%.
- The calculation of the frequency of the BSE Sensex Index is 1.36%.
- The PE Ratio of the BSE Sensex is 22.64, the P/B Ratio of the Index is 4.05, and the dividend yield is 1.26.
- The BSE Sensex has diversified into various sectors; meanwhile, the top three sectors of the index are Finance, Information Technology, and Oil & Gas.
- The percentage of the top three sectors is 36.05%, 10.27%, 9.01%
- The calculation of the BSE Sensex is based on full-adjusted market capitalisation.
- The full market capitalisation of the index is ₹ 19,482,850.46 crore, and the free-float market capitalisation is ₹ 11,231,673.26 crore.
Eligibility criteria of the BSE Sensex Index
- The company must be listed on the BSE and shall fulfil the criteria of active trading.
- The company shall not be suspended from the BSE Index.
- The trading frequency shall be at least 98% of the total trading days in the past 12 months.
- The condition of high liquidity and regular participation shall be fulfilled for the last 12 months.
- The representation of any single sector shall not be so high as to affect the other sectors negatively.
- Companies must follow the BSE listing Regulations and should have a track record of financial wealth and governance.
- The BSE Sensex Index should follow the rebalancing criteria on a semi-annual basis.
- If the companies do not fulfil the eligibility criteria, then they will be excluded from the Index and replaced with the company that fulfils it.
Calculation and formulation of the BSE Sensex
By using the method of free-float market capitalisation, the BSE Sensex value shall be determined. The free-float market value of the 30 companies is reflected by the level of the index at any one time and then compared to the base period. The steps in calculating the market capitalisation are as follows: firstly, dividing the share price by the total number of shares of the company, and then multiplying it by the free-float market capitalisation and the free-float factor.
The review criteria for the BSE Sensex Index are conducted between June and December. The Index evaluates the economic conditions of the country among various sectors, and also contributes to the development of the country and provides support to the developing sectors.
The market capitalisation shall be determined by multiplying the number of outstanding shares by the share price and then multiplying the market capitalisation by the proportion of available free float to the number of outstanding shares.
The formula for the BSE Sensex Index = Total Free-Float Market Capitalisation* Base Index Value/ Base Market Capitalisation.
Advantages of the BSE Sensex Index
- It covers the large-cap top 30 companies and provides diversification to the investors, which helps them ensure that the index is highly growing and developing.
- The BSE Sensex Index provides high liquidity, which provides investors with the ability to enter and exit the market freely.
- It acted as a benchmark for large-cap ETFs, mutual funds, and index funds, which help investors track the stock market performance.
Disadvantages of the BSE Sensex Index
- The BSE Sensex Index is most similar to the Nifty Index, which limits the ability of uniqueness for the investors.
- The index is biased towards the small-cap sector, encompassing industries such as media, tourism, chemicals, and many others. It focuses mainly on the large-cap sector, such as Banking, IT, and energy sectors.
- Investors have a high chance of missing out on high growth and returns after investing in the BSE Sensex Index.
How can I invest in the BSE Sensex Index?
The investors should research the high-value stocks in the diversified sector of the BSE Sensex Index; the companies with strong financials and high profitability in the future can provide long-term growth and stability. Investors should open a demat account for trading and also select a broker to choose the best BSE Sensex top 30 stocks, which offer high potential for future growth. Or, when investing in the BSE Sensex, the completion of KYC is necessary, which enables investors to choose the best stocks in the BSE Sensex. On the platform of the brokerage, Investors can assess the Mutual Funds or ETFs. The investors can track the performance of the BSE Sensex Index Stocks through their demat account.
Conclusion
The BSE Sensex is an Index which is used as an analytical tool to measure the performance of the top 30 largest and liquid stocks in the BSE LargeMidCap. The method used in valuing the BSE Sensex Index is based on float-adjusted market capitalisation. The BSE Sensex index comprises the top 30 constituent stocks, representing liquid, sizable, and competitive companies. The BSE Sensex Index widely covers the electronic media in the markets of both domestic and foreign representatives. The world was not as developed at that time, but the revolution of the BSE Sensex Index gained popularity due to its reliable data and trust among investors.
The company must be listed on the BSE and shall fulfil the criteria of active trading. The trading frequency shall be at least 98% of the total trading days in the past 12 months. If the companies do not fulfil the eligibility criteria, then they will be excluded from the Index and replaced with the company that fulfils it. It covers large-cap companies and provides diversification to the investors, which helps them ensure that the index is highly growing and developing.
FAQs
What is the BSE Sensex?

The BSE Sensex is an Index which is used as an analytical tool to measure the performance of the top 30 largest and liquid stocks in the BSE LargeMidCap. The method used in valuing the BSE Sensex Index is based on float-adjusted market capitalisation.
What are the eligibility criteria for the BSE Sensex?

The company must be listed on the BSE and shall fulfil the criteria of active trading. If the companies do not satisfy the eligibility criteria, then they will be excluded from the Index and replaced with the company that fulfils it.
How can I invest in the BSE Sensex?

The investors should research the high-value stocks in the diversified sector of the BSE Sensex Index; the companies with strong financials and high profitability in the future can provide long-term growth and stability. On the platform of the brokerage, Investors can assess the Mutual Funds or ETFs. The investors can track the performance of the BSE Sensex Index Stocks through their demat account.
What are the benefits of the BSE Sensex Index?

It covers large-cap companies and provides diversification to the investors, which helps them ensure that the index is highly growing and developing. The BSE Sensex Index offers high liquidity, which provides investors with the ability to enter and exit the market freely.
