This is calculated as Short Interest divided by the Float and is expressed as a percentage.

Previous Month Factors
Since the short interest data is only available twice a month (or monthly prior to 2007), the PM ratios pull data from previous data points that may be longer than a calendar month.

NOTE: When Float is not available it is approximated using the number of outstanding shares multiplied by the % owned by insiders. If this still resolves to N/A it evaluates to % of shares outstanding

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