Free float

Free float measures how much of a company the market can actually trade. Promoters rarely sell, and some other holders, such as a strategic partner or a group company, hold for control rather than for trading. Their shares exist, but they are not part of the daily supply.

Why index providers use it

The Nifty 50 and most other Indian indices are weighted by free-float market cap, not full market cap. Index providers apply an investable weight factor to each company, which strips out promoter holdings and other shares unlikely to trade. Two companies with the same market cap can therefore have very different index weights. Index funds and ETFs buy in proportion to those weights, so free float decides how much passive money flows into a stock.

Free float and liquidity

A small free float means few shares change hands, which tends to mean wider spreads, larger price swings and a higher impact cost when a big investor buys or sells. In small companies with high promoter holdings, large fund inflows have to go into a thin pool of tradable shares. In September 2026, small-cap mutual funds took in about ₹9,000 crore, more than any other equity fund category, according to AMFI data. The analysis of small-cap liquidity explains why thin floats and big flows can lift prices on the way up and make selling hard on the way down.

The link to minimum public shareholding

Listed companies must keep at least 25 percent of their shares with public shareholders, so promoter holding is capped at 75 percent for most companies. That puts a floor under free float. Public shareholding and free float are close but not identical, because index providers can exclude some public holdings that are unlikely to trade.

Where to find it

The quarterly shareholding pattern on the BSE or NSE website shows promoter and public holdings. Index providers publish the free-float factors they use in their methodology documents and periodic updates.

Common mistakes

• Confusing free float with trading volume. A stock can have a large free float and still trade thinly.
• Using free-float market cap to work out enterprise value. EV uses the full market cap, because a buyer must pay for every share.
• Forgetting that pledged promoter shares are still promoter shares. If a lender sells them, the free float rises, and so does the supply of stock.

Questions investors ask

How do I calculate free float? Subtract promoter group holdings and other locked-in or strategic holdings from total shares, then divide by total shares.

Why does free float matter to a long-term investor? Because it affects how easily you can buy or sell, and how much index money the stock attracts.