Grande, definitely not, read the below for the rules regarding threshold list inclusion, it is all about "fail to delivers", not shorting in particular. In theory, you could have a stock where 50% of the float has been sold short for a year, and not be on the list as long as the shares sold short were borrowed legitimately.
Background As defined in Rule 203(c)(6) of Regulation SHO, a “threshold security” is any equity security of any issuer that is registered under Section 12 of the Exchange Act, or that is required to file reports under Section 15(d) of the Exchange Act (commonly referred to as reporting securities), where, for five consecutive settlement days:
* There are aggregate fails to deliver at a registered clearing agency of 10,000 shares or more per security;
* The level of fails is equal to at least one-half of one percent of the issuer’s total shares outstanding; and
* The security is included on a list published by a self-regulatory organization (SRO).
A security ceases to be a threshold security if it does not exceed the specified level of fails for five consecutive settlement days.
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