Why does StockTools not show short interest as a percent of float?

Because no free source publishes a float share count, so a percent of float would be either a renamed figure or someone else's licensed estimate; StockTools shows short interest as a percent of shares outstanding instead.

Float is the shares available to trade: shares outstanding minus those held by insiders, large holders and anyone restricted from selling. Companies file shares outstanding with the SEC. Nobody files float, so every float figure is an estimate built by someone.

Percent of shares outstanding is lower than percent of float for the same position, because outstanding is the larger count. Each ticker page names which count it used and the filing it came from.

Go deeper

• Float and share count: the filed share counts and what they are.
• What stock float is: float against shares outstanding, worked through.
• Short interest by ticker: percent of shares outstanding, from filings.

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