there are two other equally important problems with shorting MDBX: 1. Availability of MDBX shares to borrow 2. Borrow rate is over 100% annualized MDBX pps is close to dropping below a point where retail shorting no longer makes sense. You will require a $2.50 margin deposit PER SHARE. When the pps goes below that you start tying up more and more money relative to decreasing return potential.