Island when it was Island not part of the NBBO, but now it INET.
Brut is part of the NBBO via, CAES
Trac" "
INET" "
Since all the buyouts they are on exchanges. Trac has two ECN's/books. Same with Attain which was bought out by Knight. It is now called Edge I think. As long as they are not part of an exchange(NMS) then you can trade through on listed. But it still happens all the time on regionals because sometimes the markets are too fast. And if it does it is their responsiblity not yours.
Brut is part of the NBBO via, CAES
Trac" "
INET" "
Since all the buyouts they are on exchanges. Trac has two ECN's/books. Same with Attain which was bought out by Knight. It is now called Edge I think. As long as they are not part of an exchange(NMS) then you can trade through on listed. But it still happens all the time on regionals because sometimes the markets are too fast. And if it does it is their responsiblity not yours.
Quote from jimrockford:
Well, I guess it is sounding more and more like what I have observed is due to my own broker, rather than the ECNs. I have, in the past, attempted to cross NYSE/AMEX, with and without my broker's order router, and it didn't work. Direct-routed ARCA orders, crossing the market, would be rejected and immediately cancelled, for example. Island orders would simply fail to execute or to be displayed, until the market I was attempting to cross removed its quote. My recollection of reading, on ECN websites, that ECNs enforce trade-thru restrictions to the extent they are part of ITS, must have been inaccurate, since it seems you are all unanimous that ECNs do not enforce any trade-thru restrictions whatsoever.