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

To work out market capitalization you multiply the share price by the number of shares. But which share count? Two figures come up constantly and they mean different things: shares outstanding and float.

Key takeaways

• Shares outstanding is every share a company has issued.
• Float is the portion that trades freely, excluding closely held or restricted shares.
• Standard market cap uses shares outstanding.
• Indexes usually weight companies by float-adjusted market cap.

What are shares outstanding?

Shares outstanding is the total number of shares a company has issued and that are currently held by everyone: institutions, the public, insiders, and the company's own executives. This is the figure behind standard market cap.

Market cap = share price × shares outstanding

It represents the entire equity of the company, whoever happens to hold it.

What is float?

Float, often called free float, is the slice of those 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. A company can have a huge share count but a small float if insiders hold most of the shares.

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 avoids overweighting companies whose shares are mostly locked away.
• Reading big moves. In a low-float stock, a fairly small amount of buying or selling can swing the price hard.

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. For the full picture of how the ranking is built, see How the MarketCapLens Ranking Works.

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For general education only. Nothing here is investment advice.