The NYSE will trade right through orders posted on other exchanges. ARCA is an exchange, BTW, and anyone can route through them. Legally (if I'm not mistaken) the NYSE has to treat ARCA like any regional exchange -- in other words, it can ignore it and trade through it even though it's not supposed to. There is a guy at the NYSE who takes complaints by mail. I urge you to contact him because, if enough people do, they will have to do something. When fighting an institution, the first thing to do is create a paper trail. You may not (or you may) get a fix on a particular fill, but eventually Market Surveillance might say something like, 'hey, you guys, straighten out a little, I'm buried in complaints. ' Also, specialists who make lousy markets and are complained about are not favored highly when it comes time to pass out new listings, which they all covet. In fact, here is the Market Surveillance fellow's address (I received it via email). Use it. I think I'm going to make a form letter so all I have to do is pencil in the particulars and send it off. It works in other businesses, it ought to work here.