Quote from sprstpd:
I trade through IB and you cannot put in a short sale that is lower than the previous day's closing price into any ECN in pre-market (for listed stocks). The price of that order gets modified to 1 penny above the closing price (or at the closing price - I can't remember).
Where do you trade that allows you to get shorts off without getting a listed uptick in pre-market trading?
You must mark the order as a straight sell, not a short sale.