What causes a stock options to trade through bid?

[TrailerParkTed]

I don't know the reason either, but people at CBOE used to say that in these cases you can be sure that the trade was on the bid, i.e., the option was sold. The same applies for trades going through the ask.

had many many market orders frequently go through the Bid & Ask on Nasdaq with a big Direct Access brokers.





Infuriating, you pay $.005+ECN fees or as high as $1.75 a contract(I pay $0-.50) only to get screwed while PFOF stayed inside NBBO like Fidelity, Schwab(Before TD), TD, Etrade. No more (300-1,000 RTs), no more broker fluffing if you get a worse fill than Schwab.