Shares Outstanding vs. Float: What's the Difference?

Shares outstanding are issued shares currently held by investors, including insiders. They exclude treasury shares the company still holds. Float is the slice of those outstanding shares that actually trades. To work out market capitalization you multiply the share price by a share count — and which count you pick changes the story.

Key takeaways

• Shares outstanding = issued shares − treasury shares, where the company holds its own stock.
• Float is a subset of outstanding shares; providers exclude closely held or restricted stock in their own ways.
• Standard market cap uses point-in-time shares outstanding, not the weighted-average count used for EPS.
• Example: 100 million issued and 10 million in treasury leave 90 million outstanding.

Shares outstanding = issued shares − treasury shares

Market cap = share price × shares outstanding

What are shares outstanding?

Issued shares are the shares the company has actually created. Outstanding shares are the ones investors currently hold — institutions, the public, insiders, and executives. Treasury shares are issued shares the company bought back and has not retired, so they sit on the company's own books instead of in the market. Retired shares are cancelled; they leave both the issued and outstanding counts.

This outstanding figure is the one behind standard market cap. The market cap calculator asks for shares outstanding, not float.

What is float?

Float, often called free float, is the slice of outstanding shares actually available to trade on the open market. It leaves out shares that are locked up or closely held, such as:

• Large stakes held by founders, executives, or a controlling family
• Shares held by governments or strategic partners
• Restricted shares that have not vested or cleared a lock-up period

Float is therefore always less than or equal to shares outstanding. It is not a subset of raw issued shares that still include treasury stock. A company can have a huge outstanding count but a small float if insiders hold most of the shares.

A ladder of share counts

Suppose a company has 200 million authorized, 100 million issued, and 10 million held in treasury. Outstanding is 90 million. A provider might treat 60 million of those as free float. At $50 a share, market cap is $4.5 billion.

Market cap uses the outstanding row. Earnings per share uses a weighted-average row from the income statement. Mixing those two counts is a common source of mismatched P/E figures.

Outstanding versus float in market cap

Same price, different share counts, different “sizes.” A company at $50 with 1 billion outstanding and a 600 million float is $50 billion on a standard market-cap ranking and $30 billion on a float-adjusted index.

Walmart is a standard illustration: a large family holding means the float is smaller than shares outstanding, so a float-weighted index gives Walmart less weight than a full market-cap ranking. Meta is the dual-class version of the same idea — founder shares sit outside the freely traded float, but they still count toward the company's full market cap (see dual-class shares and market cap).

Why the difference matters

• Liquidity. A smaller float means fewer shares trade hands, which can make a stock more volatile and harder to buy or sell without nudging the price.
• Index weighting. Most major indexes weight members by float-adjusted market cap, so only the freely tradable shares count toward a company's weight. That way companies whose shares are mostly locked up do not get extra index weight.
• Reading big moves. In a low-float stock, a fairly small amount of buying or selling can swing the price hard.

What this leaves out

Vendors do not always define float the same way (who counts as an insider, how dual-class votes are treated). A ranking that uses outstanding shares will disagree with a float-weighted index even when both are honest. Dual-class is a different question — summing classes vs. which shares trade freely — see dual-class shares and market cap. Treasury accounting also varies: some buybacks are retired rather than held as treasury stock, which changes the issued count itself.

Which one does MarketCapLens use?

The ranking uses standard market cap based on total shares outstanding, the conventional way to measure a company's overall size. Float becomes the more useful lens when you are thinking about how tradable a stock is or how an index will weight it, rather than how big the company is.

If the company has multiple share classes, that is a different question — we combine classes so the company is counted once. See dual-class shares and market cap. For the full picture of how the ranking is built, see How the MarketCapLens Ranking Works.

For general education only. Nothing here is investment advice.