Investopedia Says... The total number of shares publicly owned and available for trading. The float is calculated by subtracting restricted shares from outstanding shares.
Also known as "free float".
For example, a company may have 10 million outstanding shares, but only seven million are trading on the stock market. Therefore, this company's float would be seven million.
Stocks with small floats of less than three million shares tend to be a lot more volatile than others.
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