What is free float in the stock market?

Free float refers to the proportion of a company's shares that are actually available for trading by the general public. It excludes shares that are effectively locked away — typically those held by sponsors and founders, directors, controlling shareholders, the government, and other strategic investors who hold long-term blocks rather than trading them.

Consider a company with 1 billion shares outstanding, of which sponsors hold 700 million and never sell. Only the remaining 300 million circulate in the market, so the free float is 30%. The other 70% exists but does not contribute to day-to-day liquidity.

Free float matters for two big reasons on the PSX.

First, index weighting. The KSE-100 and other PSX indices are weighted by free-float market capitalisation, not total market cap. This means a company's pull on the index reflects the value of its tradable shares. A giant company with a tiny free float can have a smaller index weight than a medium-sized company whose shares are widely held, which keeps the index representative of what investors can actually buy and sell.

Second, liquidity and price behaviour. A low free float means fewer shares change hands, so the stock can be illiquid and prices can be volatile — a relatively small buy or sell order can move the price sharply, and wide bid-ask spreads are common. High-free-float stocks tend to trade more smoothly and are easier to enter and exit in size, which is why large institutions favour them.

Free float also affects the risk of price manipulation: thinly floated shares are easier for a few players to push around, so regulators and cautious investors pay attention to it.

For investors, checking the free float is a quick health check. A blue-chip with a high free float is generally easier to trade and less prone to sudden gaps. A stock with a very low free float may look attractive but can be hard to sell when you want to, and its quoted market cap can overstate how much value is genuinely "in play."

In short, total shares tell you how big a company is on paper; free float tells you how much of it the market can really trade — and that distinction shapes index weights, liquidity, and risk.