I've been watching the L2 on POZN the past couple of days and it seems that whomever is using the ECN- ISEG, is doing the shorting right now.
Saw what seemed like them covering two 25k lots yesterday (huge buy volume but no price movement), it was wild to watch, I'm not an L2 expert, but that's what it looked like
and today they're back in the axe position
approval day will be interesting to say the least
-d