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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Sensex and Nifty 50 are Indian stock-market benchmarks, but they track different exchange universes: Sensex targets 30 companies from the BSE 100 eligible universe, while Nifty 50 tracks 50 stocks on the NSE. Both weight constituents by investable, float-adjusted market value. Neither is inherently better; follow the benchmark that matches the market or portfolio you want to track.
Sensex vs Nifty 50 at a glance
| Feature | Sensex | Nifty 50 |
|---|---|---|
| Exchange and index source | BSE | NSE; maintained by NSE Indices |
| Constituent target | 30 companies | 50 stocks |
| Selection universe | Derived from BSE 100 constituents | Stocks selected under NSE Indices methodology |
| Weighting | Float-adjusted market capitalization | Free-float market capitalization |
The counts and construction rules come from the BSE Indices methodology and NSE Indices’ Nifty 50 overview. “Float” means shares treated as available for public trading, rather than all shares a company has issued.
How the indices choose and weight companies
Sensex: 30-company target from the BSE 100
BSE’s methodology derives Sensex from BSE 100 constituents and targets 30 companies. For eligibility, a stock must have been listed on BSE for at least six months, have traded on every trading day in the six-month reference period, and have a derivative contract. BSE ranks eligible companies using six-month average float-adjusted and total market capitalization, applies traded-value and minimum-weight screens, then selects constituents using ranking rules that give existing members preference at specified ranks.
Sensex constituents are weighted by float-adjusted market capitalization, so companies with greater eligible market value have greater influence on the index. BSE says qualifying shares with differential voting rights can mean more than 30 securities while the company count remains 30.
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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. Under the free-float approach, promoter, group, locked-in, and identifiable strategic holdings are treated as not generally available for trading; the weighting therefore reflects the shares considered investable. See NSE Indices’ explanation of index calculation and its March 2026 equity-index methodology.
Why Sensex and Nifty 50 can move differently
The indices do not contain the same number of companies or draw on precisely the same selection universe. Their constituent holdings and the weight assigned to each company can therefore differ. As a result, the same market session can produce different index movements, and one index’s change does not establish how the other performed.
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Index point levels are not a sound way to decide which performed better: the levels use different index bases. For performance comparisons, compare percentage returns over the same dates, using the same return convention where available, rather than comparing raw points.
What the Nifty 50 coverage figure does—and does not—show
NSE Indices reports that Nifty 50 represented 53.73% of the free-float market capitalization of NSE-listed stocks as of March 30, 2026. That statistic has a specific date and denominator. It is not a Sensex coverage figure, and the available BSE methodology does not establish a current directly comparable Sensex percentage. It therefore cannot be used by itself to conclude that one index represents the market more completely.
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.
- Follow both if you want to observe how benchmarks built from the two exchange universes differ; remember that their constituents and weights are not identical.
If you are assessing an index fund or ETF, start with the benchmark that product tracks. Then assess the specific fund’s holdings, costs, and tracking behavior; an index label alone does not tell you those product-level details. Neither index should be called safer or expected to deliver higher returns without a defined comparison period and evidence.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to keep the comparison current
Constituents, weights, and methodology can change. For a current comparison, check the official BSE methodology and NSE Indices’ Nifty 50 page, noting the date attached to any statistic. A coverage figure or constituent list should not be treated as timeless simply because the index name stays the same.
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