NITE is actually one of the "good" MM's, and is almost always retail http://www.nasdaq.com/markets/ipos/company/knight-capital-group-llc-11859-4601 https://en.wikipedia.org/wiki/Knight_Capital_Group http://www.wikinvest.com/stock/Knight_Capital_Group_(KCG) https://www.streetinsider.com/Corporate+News/Knight+Capital+%28NITE%29+To+Become+Competitive+Market+Maker+on+ISEs+Options+Exchange/5166776.html