Who do you think is the worst Market Maker out there? I would have to go with GSCO. No one can ruin a perfectly good move like Goldman. He will sit on the offer with 100 shares until the market ticks down and not give out any prints. I know all the MM's do it but GSCO seems to be the worst. These felons have no shame. I would have to give ABNA and SLKC the runners up award. They both could stop any stock dead in its tracks. What are some of your worst?