Float (Stock Float)
The number of shares of a company's stock that are available for public trading, calculated by subtracting insider-owned shares, restricted shares, and other locked-up shares from total shares outstanding.
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Explained Simply
Float is one of the most important concepts in day trading. When supply is limited, even moderate buying demand can move a stock's price dramatically.
Formula: Float = Shares Outstanding − Insider Shares − Restricted Shares − Shares Held by Institutions Under Lock-Up
Float size categories:
- Nano float (<1M shares): extremely volatile. A $1M order can swing the price 10-20%+. Very high risk.
- Low float (1M–20M shares): high volatility and squeeze potential. Favored by day traders.
- Mid float (20M–100M shares): moderate volatility. Requires more volume to create large moves.
- Large float (>500M shares): typical of mega-caps like AAPL or MSFT. Needs massive buying pressure for significant price moves.
Why float matters more than market cap: A $500M market cap stock with a 5M share float is far easier to move than a $500M market cap stock with a 500M share float. Supply and demand work the same here as with any commodity — scarcity amplifies price swings.
Float rotation: When a low-float stock trades its entire float in a single day, it is said to have "rotated its float." This is a signal of extreme activity. A stock with a 3M share float that trades 15M shares in a day has rotated its float 5x — a major indicator of potential continuation or climax reversal.
Dilution risk: Micro-cap and low-float stocks are at risk of share offerings (secondaries) that increase the float. When a company announces a stock offering, the float expands suddenly, often causing a sharp price drop as supply overwhelms demand. Always monitor SEC filings for low-float stocks.
Free Float vs. Shares Outstanding vs. Float
These three terms are related but distinct:
- Shares Outstanding: total shares issued by the company (including all restricted and insider shares)
- Float: shares available for public trading (outstanding minus locked-up shares)
- Free Float: similar to float but also excludes strategic holdings by large shareholders (typically >5%) who hold for control rather than investment
For most day-trading purposes, float and free float are used interchangeably. The distinction matters for index inclusion calculations — some indexes use free float weighting.
How to Find Float Data
Float data is available from:
- Finviz (float column in screener — free)
- Stockcharts.com / StockAnalysis.com (company overview pages)
- SEC filings: shares outstanding is reported in 10-Q and 10-K filings; insider ownership comes from proxy statements (DEF 14A) and Form 4 filings
Note that float data in screeners can be slightly stale. Always verify for low-float stocks with recent insider activity or stock offerings.
How to Use Float (Stock Float)
- 1
Calculate Public Float
Public Float = Total Shares Outstanding - Restricted Shares (insider holdings, locked-up shares, treasury stock). This tells you how many shares are actually available for trading. A company with 100M total shares but 60M restricted has a 40M share float.
- 2
Use Float for Volatility Assessment
Low float (<20M): high volatility, prone to squeezes. Medium float (20-100M): moderate volatility. High float (>100M): low volatility, institutional-grade. Match your position sizing and strategy to the float size — smaller float = smaller position.
- 3
Check Float Before Trading Low-Cap Stocks
A stock with 10M total shares might have only 3M float after insider/institutional lockups. This means the effective tradeable supply is tiny — even modest buying can cause large price spikes. Always check float, not just shares outstanding, for accurate volatility assessment.
Frequently Asked Questions
What is considered a "low float" stock?
Generally, stocks with fewer than 20 million shares available for public trading are considered low float. Stocks below 5 million shares are considered very low float and tend to be extremely volatile. Day traders actively seek low-float stocks with upcoming catalysts because they can move 20-50%+ in a single day.
How does float affect short squeezes?
Low float dramatically amplifies short squeeze potential. When a stock has 5 million shares in its float and short sellers have borrowed 2 million of them (40% short interest), even small buying pressure can overwhelm available supply. As short sellers rush to cover, the limited float means every covering buy pushes prices higher, accelerating the squeeze.
How Tradewink Uses Float (Stock Float)
Tradewink's screener uses float as a core filter. The day-trade universe excludes stocks with float below 500K shares (too illiquid to execute safely) and tracks float rotation as a momentum signal. When a stock's daily volume exceeds 50% of its float, the system flags it as a high-activity candidate. The position sizer automatically reduces position size for low-float stocks to avoid becoming a significant percentage of daily volume — which would create adverse market impact.
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See Float (Stock Float) in real trade signals
Tradewink uses float (stock float) as part of its AI signal pipeline. Get daily trade ideas with full analysis — free to start.