--- title: "Nifty 100: Methodology" description: "Nifty 100 is maintained by NSE Indices / Asia Index and covers Indian large-cap equity benchmark. How the index selects and weights its constituents." canonical: https://www.getswoopr.com/stocks/indexes/nifty-100/ source: "Swoopr Investment: https://www.getswoopr.com" --- # Nifty 100: What It Measures and How It Is Built ## Direct Answer > The Nifty 100 is a rule-based measurement of Indian large-cap equity benchmark, maintained by NSE Indices / Asia Index. Like every index it owns nothing: it is a number produced by applying a published weighting formula to a selected list of companies, revised on a schedule the provider sets. ## What this index covers The Nifty 100 covers Indian large-cap equity benchmark, within the India market. NSE Indices / Asia Index defines which securities are eligible, how they are selected from that pool, and how much each one contributes to the published number. The name states a target of 100 companies. A target is not a guarantee of the exact count on any given day: corporate actions, dual share classes and pending additions all move the real number around it. ## How constituents are weighted Free float market capitalization weighted with no single-stock cap and a fixed number of companies. Each stock enters at its free float market value rather than its full market value. The weighting method is the single biggest driver of how an index behaves. Two indexes covering the same market can diverge for years purely because they weight differently, which is why comparing index levels without knowing the method tells you very little. ## What qualifies for inclusion Candidates must already be Nifty 500 constituents with an investible weight factor of at least 0.10, or six month free float market cap of at least 25% of the smallest Nifty 100 member. On a prospective basis, non F&O stocks qualify only if upper or lower circuit hits stay under 20% of trading days over six months. Eligibility rules are the part of an index most readers never look at and the part that decides what it can possibly measure. A screen that excludes a whole sector, or admits only one listing venue, shapes the result far more than any day of trading does. ## How long a listing must exist first Candidates must already sit in the Nifty 500, which tests six months of data (90% trading days); a newly listed security is tested on one month of data instead. A seasoning rule is why a large new listing does not appear in an index the week it starts trading. It is a deliberate lag, and it means an index can under-represent a fast-growing part of the market for months at a time. ## When the membership is revised Reviewed semi-annually using six months of data ending January and July. A review may replace at most five stocks, a limit that does not cover exclusions for ineligibility, loss of Nifty 500 membership or corporate events such as merger, delisting or suspension. Reconstitution is the one date an index changes shape by design rather than by price. Funds tracking it have to trade toward the new membership, which is why the schedule matters to anyone holding the tracker rather than only to the provider. ## The rule that surprises people Entry tests cite a top 90 rank on average full market cap, while an existing member is removed only once its rank falls beyond 110, so membership has a 20 place buffer. ## References - [NSE Indices / Asia Index: NSE Indices Limited, Methodology Document for Equity Indices (September 2026)](https://www.niftyindices.com/Methodology/Method_NIFTY_Equity_Indices.pdf), as published 2026. Every rule described on this page is taken from this document. ## Current Nifty 100 constituents NSE Indices / Asia Index publishes and licenses the Nifty 100 constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights. [NSE Indices / Asia Index: official Nifty 100 page](https://www.niftyindices.com/indices/equity/broad-based-indices) ## Related reading - [All stock market indexes](https://www.getswoopr.com/stocks/indexes/): how indexes are built, weighted and revised. - [Emerging Markets indexes](https://www.getswoopr.com/stocks/indexes/emerging-markets/): others covering the same region. - [Index concentration](https://www.getswoopr.com/technical-analysis/market-concentration/index-concentration/): measuring how much of an index sits in its largest holdings. - [Index rebalancing and inclusion effects](https://www.getswoopr.com/stocks/corporate-actions-catalysts/index-rebalancing-and-inclusion-effects/): what happens to a stock when index membership changes. ## Frequently Asked Questions ### Who maintains the Nifty 100? NSE Indices / Asia Index maintains the Nifty 100 and publishes the methodology document that defines its eligibility and weighting rules. ### What does the Nifty 100 measure? It measures Indian large-cap equity benchmark. The index is a calculated number applying a weighting formula to a selected list of companies, and it holds nothing itself. ### Where can I see the current Nifty 100 constituents? NSE Indices / Asia Index publishes the current constituent list. Swoopr does not republish it, because index providers license constituent data and Swoopr holds no such licence. ## About the author The [Swoopr Editorial Team](https://www.getswoopr.com/authors/swoopr-editorial-team/) writes Swoopr Investment's educational library, covering market structure, analysis methods and the mechanics behind the numbers investors read every day. Our [editorial policy](https://www.getswoopr.com/legal/editorial-policy/) and [corrections policy](https://www.getswoopr.com/legal/corrections-policy/) set out how this content is produced, reviewed and fixed when it is wrong.