What Is Free Float Market Cap? (2026)
Free float is the portion of a company's shares that is actually available for the public to buy and sell, as opposed to the shares locked up with promoters, the government, or other strategic holders. When you multiply a company's total market capitalisation by its free float, you get its free-float market cap, the number most Indian indices use to weight their constituents. Free float matters because it separates the stock that trades from the stock that mostly sits still.
Definition
Free float
is the share of a company's equity that is freely available for public trading, after removing promoter, government, strategic, and locked-in holdings. Free-float market cap weights a stock by that tradable portion, which is why major indices like the Sensex use it. Source: BSE and NSE index methodology.
What is excluded from free float?
The free-float calculation strips out shares that are not realistically available to trade. Excluded holdings typically include:
- Promoter and promoter-group holding
- Government shareholding
- Strategic holdings by other companies or entities
- Locked-in shares
- Shares held by employee welfare trusts and cross-holdings
What is left is the public float, the shares that change hands in the market. You can see the building blocks of this split in a company's shareholding pattern, which breaks holding into promoter, institutional, and public buckets.
How is free float market cap calculated?
The method is a simple adjustment. Take total market cap, then multiply by the free-float factor, which is the fraction of shares that are publicly tradable. The BSE describes this factor directly: a free-float factor of 0.55 means only 55% of the company's market capitalisation is counted for the index. The NSE uses an equivalent idea called the Investible Weight Factor, derived from the public shareholding disclosed in each company's quarterly shareholding pattern.
2003
Year the BSE Sensex moved to a free-float methodology
Source: BSE Free-Float methodology
Why do indices use free float?
Before free float, an index could be dominated by a company whose promoters held most of the shares, even though few of those shares ever traded. Free-float weighting fixes that. By weighting stocks on the shares investors can actually buy, an index better reflects the market people participate in. This is why the Sensex switched to free float in 2003 and the Nifty uses its investible-weight approach.
Why free float matters when you read ownership data
Free float is the flip side of concentrated ownership. A stock with a low free float has a lot of its equity tied up with promoters or strategic holders, which can mean thinner trading and sharper price moves. High promoter pledging or heavy institutional accumulation both play out against the backdrop of how much float exists in the first place. When several independent investors accumulate a low-float name, that ownership overlap sits in a smaller pool of tradable shares.
Flock reads the promoter, institutional, and public split from the same public filings that feed free-float calculations, dated and source-linked. What it means for you is your call to make.
Frequently asked questions
What is excluded from free float?
Free float excludes shares that are not readily tradable: promoter and promoter-group holding, government stakes, strategic holdings, locked-in shares, and shares held by employee welfare trusts. What remains is the public float that trades day to day. Source: BSE and NSE index methodology.
How is free float market cap calculated?
Free float market cap is the total market capitalisation multiplied by the free-float factor, the fraction of shares that are publicly tradable. A free-float factor of 0.55 means 55% of the company's market cap counts. Source: BSE Free-Float methodology.
Why do indices use free float?
Free-float weighting stops companies with large promoter or government stakes from dominating an index on shares that rarely trade. The BSE Sensex moved to free-float in 2003, and the Nifty uses a similar investible-weight approach. Source: BSE and NSE.
Flock tracks these filings, sourced, dated, and linked back to the original. See what smart-money entities disclosed, without the guesswork about what it means.
Disclosures shown are public regulatory filings. Data may be delayed or incomplete. Smart-money entities may no longer hold positions shown. Not investment advice.