I sent INET an order today and I saw that the stock traded-through my price. Why wasn?t it executed?
It is possible for trades to be executed away from the current National Best Bid/Offer (NBBO). This can happen for a number of reasons including: (1) the firm entering the order made an error; (2) if INET has the best price in a security, a market maker or order entry firm may choose to execute a trade at an inferior price, resulting in the stock trading-through your limit price.