TNO-Mike wrote:
I spoke with our head trader at TNO yesterday on the subject of the Stop Limit Orders on ARCA. Here is what I was told.
The following statement,
âIn other words, my stop is triggered at 50.00 (with a limit at 49.90). It first goes to it's own book, tries to fill my order between 49.90 and 50.00, starting at 50.00 and working down. But only if it can't fill me from it's own book does it even bother to look elsewhere....â is NOT correct.
Once the stop price is triggered, the order is activated as a Limit Order and follows ARCA's SmartBook⢠proprietary execution algorithm to find the best price available internally and/or externally. Yes, it will look on the ARCA internal book, but at the same time they scan the Market looking at the NBBO. If a better price exists elsewhere they will outbound preference to another MarketMaker or ECN if they can get a better price than with an internal match.
Baronâs response âIn terms of priority, ARCA does not put its own book above the best price available. It only goes to its own book first when there are multiple participants with the best priceâ¦â is right on.
The important thing to realize here is that the stop price just triggers the order and then from there it follows ARCAâs SmartBook⢠algorithm as it would for any limit order and anyone who uses leading limit orders on ARCA would be able to attest to seeing how the price improvement works.