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Public Float

What is Public Float?

The number of a company's shares available for public trading, excluding shares held by insiders, controlling shareholders, and restricted holders.

Overview

Public float is the number of a company's shares that are available for the public to trade. It equals shares outstanding minus shares held by insiders, controlling shareholders, and other holders whose shares are restricted or unlikely to be sold.

Shares outstanding tell you how many shares exist in investors' hands. Float narrows that to the shares that can realistically change hands on an exchange on any given day. A company where founders hold half the stock has only about half of its shares in the float.

Float matters for liquidity, for how index providers weight a stock, and for reading short interest. Many major indexes, including the S&P 500, weight companies by float-adjusted market capitalization rather than total market capitalization.

Also Known As: Float, Free Float, Floating Stock, Shares Float

Formula

Public Float = Shares Outstanding − Closely Held and Restricted Shares

Float % = Public Float ÷ Shares Outstanding

Formula Components:

Shares Outstanding
All shares currently issued and held by investors, including insiders. Treasury shares the company has repurchased are excluded.
Insider Holdings
Shares owned by officers, directors, and founders.
Controlling Stakes
Large strategic holdings, such as a parent company, a government, or a family trust that does not trade its position.
Restricted Shares
Shares that cannot be sold yet, for example because of a post-IPO lock-up, vesting schedule, or securities law restrictions.

Definitions vary: Data providers and index companies draw the line differently. Some exclude only insiders and restricted shares, while others also remove large long-term holdings above a set ownership threshold. Float figures for the same company can therefore differ between sources.

On FinSpry: FinSpry does not calculate float itself. Where a stock's statistics page shows float, the figure comes from market data and reflects that source's definition and the date of the most recent ownership filings it has processed.

Calculation Example

Consider a hypothetical company that went public a few years ago:

Share Ownership:

Shares Outstanding500 million
Founders and Executives75 million
Former Parent Company Stake50 million
Unvested Restricted Stock25 million
Share Price$40.00

Step 1: Closely Held and Restricted Shares

75 + 50 + 25 = 150 million

Step 2: Public Float

Public Float = 500 million − 150 million

= 350 million shares (70%)

Result: 70% of the company's shares are available to trade. Its total market capitalization is 500 million × $40 = $20 billion, while its float-adjusted market capitalization is 350 million × $40 = $14 billion.

Why Float Changes Short Interest Readings:

Shares sold short: 17.5 million

As % of float: 17.5 ÷ 350 = 5.0%

As % of shares outstanding: 17.5 ÷ 500 = 3.5%

Short interest is usually quoted against float, because only floating shares can be borrowed and traded.

How to Interpret

Float is a count, not a quality score. What it tells you depends on its size relative to shares outstanding and to typical trading volume.

Float Levels:

High Float

When most shares are in the float, the stock tends to trade with deeper liquidity and narrower bid-ask spreads. Large orders are less likely to move the price sharply. Most large, widely held companies fall here.

Low Float

A small float, common after recent IPOs or at founder-controlled companies, means fewer shares change hands. Prices can move sharply on modest buying or selling, and the stock may carry a lower index weight than its total market capitalization suggests.

Changes in Float

Float grows when lock-ups expire, insiders sell, or the company issues new shares. It shrinks when the company buys back stock or a strategic investor builds a stake. An upcoming lock-up expiry can add a large block of tradable shares in a single day.

Related Measures to Check:

  • Average daily volume compared with float, which shows how quickly the float turns over
  • Short interest as a percentage of float
  • Insider ownership percentage, the mirror image of float
  • Dilution from new issuance, which raises both float and shares outstanding and can lower earnings per share

Limitations

  • Based on filings: Ownership data comes from periodic disclosures, so float can lag recent insider sales, buybacks, or offerings.
  • No single standard: Different providers exclude different holder types, which leads to different float figures for the same stock.
  • Institutional holders are included: Shares held by long-term funds count toward float even if they rarely trade, so float can overstate real day-to-day supply.
  • Share classes: Companies with several share classes may report float for only the listed class, which complicates comparisons with total shares outstanding.
  • Says nothing about value: Float describes tradability, not whether a company is financially sound or fairly priced.

Related Financial Metrics

These measures are closely tied to float:

Shares Outstanding

All issued shares held by investors, the starting point for calculating float.

Market Capitalization

Share price times shares outstanding; multiplying by float instead gives float-adjusted market cap.

Earnings Per Share (EPS)

Net income divided by shares outstanding, which changes when share issuance or buybacks change the share count.

Use This Metric

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