The past few weeks, house 14... i.e. ITG has been selling 500 shares at the bid right after someone buying at the ask every time... think about all the commission of these transactions... don't think it's retail... it only works when the volume is low... I have kept track of this trading behaviour as it improves my knowledge-base in future trading... can also apply to other stocks when similar situation arises...

for now, we have to wait and see...