Quote from sucre_estave:
In both cases they traded through my short order with the opening print. I know that shorts are the lowest priority, but I should have been filled if I offered a better price than the opening print. The order was in prior to 9:28, so that wasn't an issue.
They may not have traded through. Since you can't short on a downtick, the specialist considers your order entered at the lowest uptick price. Did the open trade through that?
