Nothing illegal in what I see them doing. They are just monitoring the buying interest and sell on the bid when it slows down. If they were doing phantom trades or anything like that, I would agree, but at these levels they are just trying to make a buck on the back of nervous retail investors or day traders. I, personally, try to figure out what they are doing and sell below them and buy above them. I have not done much trading this calendar year, but have picked up a few extra shares in my Roth IRA. I mostly do these trades when I am bored or when I don't see anything interesting in the general market.