Markets · BSE Indices

BSE Indices — Live Levels, Constituents & Analysis

The Sensex and the BSE sector indices — what each one tracks, how it is calculated, and which companies move it.

The Bombay Stock Exchange is Asia's oldest exchange, and its Sensex is India's most-quoted market number. These 5 BSE index pages cover the benchmark and the main sector indices, each with its live level, constituents, sector weightings and long-form explanation.

Sensex vs Nifty 50

Both are broad-market benchmarks, and they move together most days. The difference is breadth and venue: the Sensex tracks 30 companies on the BSE, while the Nifty 50 tracks 50 on the NSE. The Nifty is the more widely used base for derivatives and index funds; the Sensex has the longer history, running back to 1979.

How the Sensex is calculated

The Sensex uses free-float market capitalisation weighting. Each company's weight reflects the market value of its publicly tradable shares, not its share price, and an index divisor keeps the series comparable across time as constituents change, shares are issued, or corporate actions occur.

Index	Tracks
BSE Sensex	India's benchmark 30-stock index — live value, constituents and analysis.
BSE Bankex	The BSE banking sector index — leading public & private banks tracked live.
BSE IT	The BSE technology index — India's top IT and software companies.
BSE Auto	The BSE automobile index — carmakers, two-wheelers, EV and auto ancillaries.
BSE MidCap	The BSE mid-cap index — emerging mid-sized companies with growth potential.

Index levels are for information only and are not a recommendation to buy or sell any security or index product.

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Frequently Asked Questions

The Sensex (S&P BSE Sensex) is the Bombay Stock Exchange's benchmark index, tracking 30 of India's largest and most actively traded companies. It is weighted by free-float market capitalisation and is the most widely quoted measure of the Indian stock market.

The Sensex tracks 30 companies on the BSE; the Nifty 50 tracks 50 on the NSE. Both are free-float market-cap weighted broad-market benchmarks and usually move in step. The Nifty underpins most index derivatives and funds, while the Sensex has the longer running history.

By free-float market capitalisation: each constituent is weighted by the market value of its freely tradable shares, and the total is scaled by an index divisor that keeps the series continuous through corporate actions and constituent changes.

5: the Sensex benchmark plus the Bankex, BSE IT, BSE Auto and BSE MidCap sector indices.

Not directly, but you can invest through Sensex index funds and ETFs that replicate it, or trade index derivatives. An index fund aims to match the index return at a low expense ratio rather than beat it.

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