Float
The number of a company's shares that are available for public trading, excluding shares held by insiders, institutions with restricted stock, and other locked-up shares.
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Explained Simply
A stock's float is the portion of its outstanding shares that can actually be bought and sold on the open market. Low-float stocks (under 10-20 million shares) tend to be more volatile because there are fewer shares available to trade — any surge in demand can cause dramatic price spikes. High-float stocks (hundreds of millions or billions of shares) like Apple or Microsoft tend to move more gradually. Day traders specifically seek out low-float stocks because they offer larger percentage moves. Float also matters for short squeezes — when a large percentage of a low-float stock is sold short, a buying surge can force short sellers to cover, creating a violent upward spiral.
Float vs Outstanding Shares vs Authorized Shares
Understanding float requires distinguishing it from related share count concepts:
Authorized shares: The maximum number of shares a company is legally allowed to issue, set in the corporate charter. Apple has 50.4 billion authorized shares. This is a ceiling, not the actual count in circulation.
Outstanding shares (shares outstanding): The total number of shares that have actually been issued and exist, including insider-held, institutional-held, and publicly traded shares. Used to calculate market capitalization (price x shares outstanding) and earnings per share.
Float (public float): Outstanding shares minus restricted shares. Restricted shares include: insider holdings (CEO, CFO, board members), shares held by employees under lockup agreements (common after IPOs), shares held by strategic investors with contractual restrictions, and treasury shares (shares the company has bought back).
Example: A company has 100 million shares outstanding. Insiders own 20 million, employees hold 10 million restricted shares, and the company has 5 million treasury shares. Float = 100M - 20M - 10M - 5M = 65 million shares.
Why the distinction matters: Market cap uses outstanding shares, but trading dynamics depend on float. A stock with 500 million outstanding shares but only 10 million float trades like a small-cap despite a large-cap market cap. The float is what determines supply and demand in the market.
Why Low Float Stocks Move More
Low-float stocks are disproportionately volatile because of basic supply and demand mechanics:
Limited supply: When only 5-10 million shares are available for trading, a surge in buying demand (from news, earnings, social media attention) quickly exhausts available sellers. With few shares available, each incremental buyer pushes the price higher. This creates the explosive 20-100%+ moves that attract day traders.
Short squeeze amplification: When a significant percentage of a low-float stock is sold short (high short interest), a price increase forces short sellers to buy shares to cover their positions. On a low-float stock, this covering demand hits a limited supply, driving the price even higher, which triggers more covering — a self-reinforcing squeeze. GameStop (GME) in January 2021 was the most famous example: low float + 140% short interest + retail buying surge.
The danger of low float: The same dynamics that create explosive upside create devastating downside. When buyers disappear, sellers compete for limited bids and price drops violently. Spreads widen to $0.10-$0.50+, stop-losses gap through, and you may not be able to exit at any reasonable price. Low-float stocks can drop 30-50% in minutes.
Float thresholds for day trading: Under 10 million = ultra-low float (highest volatility, highest risk). 10-20 million = low float (volatile, popular with momentum traders). 20-50 million = moderate float (good balance of movement and liquidity). Over 100 million = high float (steadier moves, tight spreads, easier to trade with size).
How to Find and Use Float Data
Where to find float data: Yahoo Finance (Key Statistics tab), Finviz (screener includes float as a filter), your broker's stock detail page, and SEC filings (proxy statements and 10-K filings show insider ownership).
Float rotation: This occurs when the trading volume exceeds the total float within a single day. If a stock has 5 million float and trades 15 million shares in a day, the float has rotated 3 times. High float rotation signals extreme interest and often precedes continued movement the following day. Stocks that rotate their float 2x+ in the morning session are prime candidates for continuation plays.
Float and IPOs: Newly public companies often have very low floats because most shares are held by insiders and early investors under lockup agreements (typically 90-180 days). As lockup expirations approach, the anticipated increase in float creates selling pressure — many IPO stocks drop on or before lockup expiration as the market prices in the new supply.
Float changes over time: Float is not static. It changes when: insiders sell shares (float increases), the company issues new shares (float increases), employees exercise options (float increases), or the company buys back shares (float decreases). Major float changes can shift a stock's trading character — a low-float meme stock that issues new shares may lose its explosive movement profile.
Screening with float: For day trading momentum strategies, filter for float under 20 million shares combined with relative volume above 2x and price above $2. This combination identifies stocks with limited supply experiencing unusual demand — the setup for large percentage moves.
How to Use Float
- 1
Find the Float Size
Look up shares outstanding minus restricted/insider shares to get the float. Financial sites like Finviz, Yahoo Finance, and Float Checker display this. Focus on the 'float' or 'public float' number, not total shares outstanding.
- 2
Classify the Float
Micro-float: <10M shares (extremely volatile, prone to squeezes). Low float: 10-50M shares (volatile, good for momentum trades). Medium float: 50-200M shares (balanced volatility). High float: >200M shares (stable, institutional, less volatile).
- 3
Match Float to Your Strategy
Day traders prefer low floats (10-50M) because they move faster with less volume. Swing traders can use medium floats for more predictable trends. Position traders and investors prefer high floats for stability and liquidity.
- 4
Watch for Float Rotation
Calculate how much of the float has traded today: Daily Volume ÷ Float. If 100% of the float has traded, a completely new group of shareholders owns the stock — old support/resistance levels may be invalidated. Float rotation above 200% indicates extreme speculation.
- 5
Factor Float into Position Sizing
Reduce position size on low-float stocks — they gap and spike more violently. A 1% risk on a low-float stock may require a wider stop due to higher volatility. Never use your standard position size on a stock with <20M float.
Frequently Asked Questions
What is a good float for day trading?
For momentum day trading, stocks with float under 20 million shares offer the best movement potential. Ultra-low floats (under 5 million) can move 50-100%+ in a day but carry extreme risk and wide spreads. A sweet spot for most day traders is 10-50 million float with high relative volume, which provides enough volatility for meaningful profits while maintaining enough liquidity to enter and exit cleanly.
What is the difference between float and volume?
Float is the number of shares available for public trading — it is a static measure of supply. Volume is the number of shares actually traded during a period — it measures activity. A stock can have a float of 10 million shares but trade 50 million shares in a day (because the same shares change hands multiple times). When daily volume significantly exceeds float (float rotation), it signals extreme trading interest.
How does float affect short squeezes?
Low float amplifies short squeezes dramatically. When short interest is high relative to float (e.g., 30%+ of float sold short), and the stock starts rising, short sellers must buy shares to cover their positions. With limited float, this covering demand overwhelms available supply, pushing prices higher, which forces more shorts to cover. GameStop (2021) was a textbook case: 140% short interest on a low-float stock created one of the most violent squeezes in market history.
How Tradewink Uses Float
Tradewink's DayTradeScreener factors float into its candidate scoring. Low-float stocks with high relative volume receive a scoring boost because they offer greater intraday movement potential. The system also cross-references float with short interest data to identify potential short squeeze setups, and the PositionSizer reduces position sizes on extremely low-float names to account for wider spreads and higher slippage risk.
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See Float in real trade signals
Tradewink uses float as part of its AI signal pipeline. Get daily trade ideas with full analysis — free to start.