This could confirm my believe that Tzmt is being shorted. From nasdaqtrader.com: Tzmt on Sho list. As defined in Rule 203(c)(6) of Regulation SHO... 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.