Sensex and Nifty 50 are Indian stock-market benchmarks tied to different exchanges: Sensex tracks a target of 30 companies selected from the BSE 100 universe, while Nifty 50 tracks 50 stocks on the NSE. Both weight constituents by investable, free-float market value. Neither is inherently better; follow the one that matches the exchange universe or portfolio benchmark you care about.
Sensex vs Nifty 50 at a glance
| Feature | Sensex | Nifty 50 |
|---|---|---|
| Exchange | BSE | NSE |
| Constituent target | 30 companies | 50 stocks |
| Selection universe | Derived from BSE 100 constituents under BSE’s methodology | Selected under NSE Indices’ methodology |
| Weighting | Float-adjusted market capitalization | Free-float market capitalization |
| Published market coverage | No current comparable figure established in the cited BSE methodology | 53.73% of the free-float market capitalization of NSE-listed stocks as of March 30, 2026, according to NSE Indices |
Sources: BSE Indices Methodology and NSE Indices’ NIFTY 50 page. The Nifty coverage figure uses NSE-listed stocks as its denominator, so it does not establish that Nifty 50 is more representative than Sensex.
How the indices are built
Sensex: 30 companies from the BSE 100 universe
BSE’s methodology derives Sensex from BSE 100 constituents and targets 30 companies. For eligibility, a stock must have at least six months of listing history at BSE, have traded on every trading day in the six-month reference period, and have a derivative contract. The selection process ranks eligible companies using six-month average float-adjusted and total market capitalization, applies traded-value and minimum-weight screens, and includes rules that favor existing constituents in specified ranking positions.
Sensex constituents are weighted by float-adjusted market capitalization. BSE’s methodology also allows qualifying shares with differential voting rights to result in more than 30 securities while keeping the company count at 30. These are methodology rules, not a guarantee that a particular company will remain in the index.
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Nifty 50: 50 stocks on the NSE
NSE Indices describes Nifty 50 as a diversified 50-stock index representing important sectors of the economy. It has used free-float market-capitalization weighting since June 26, 2009. The broader equity-index construction and review rules are in NSE Indices’ March 2026 methodology document.
What free-float weighting means
A company’s total market value is not necessarily the value of shares available to ordinary investors to trade. Under free-float weighting, promoter, group, locked-in, and other identifiable strategic holdings are treated as non-free-float. The index weight therefore reflects the market value of shares considered available to trade, rather than simply the company’s full market capitalization. NSE Indices explains the calculation in its index-calculation guide.
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Because the indices use different selection universes and hold different numbers of companies, their constituents and company weights can differ. Their movements can therefore diverge. That is a consequence of how they are constructed, not a prediction about which will perform better.
Which index should you follow?
- Follow Sensex if you want the BSE’s 30-company headline benchmark.
- Follow Nifty 50 if you want the NSE’s 50-stock headline benchmark.
- For a portfolio comparison, use the benchmark that the portfolio is intended to track. Matching the benchmark makes the comparison more meaningful than choosing one index simply because its name or index level is more familiar.
If you are assessing an index fund or ETF, start with the fund’s stated benchmark and then compare its costs, tracking behavior, and holdings. The name “Sensex” or “Nifty” alone does not tell you whether a particular fund suits your needs.
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Do not compare Sensex and Nifty by their index point levels: the scales are not a measure of relative percentage return. For a performance comparison, use the same start and end dates and a like-for-like return measure. Also check whether the figures are price returns or total returns, since total-return measures account for reinvested distributions. The cited methodology sources establish how these indices are constructed; they do not establish that either is safer or will deliver higher returns over a chosen period.
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