Inter-spread marketable price for SPX options

[Brennen81]

Hey all,

I near solely trade SPX weekly options. Vertical spreads specifically. I bring all of the live bid/ask pricing into a live excel sheet for analyzations. In order to get an assumed fill price, (to generalize) I am typically adding a bit to the mid of the long strike, subtracting a bit from the mid of the short strike. Interactive Brokers only sends the order to the exchange if they deem it marketable. So these two prices don't always line up. I was hoping maybe someone new a service that provides these inter-spread most likely / marketable fill prices?

Thanks!!!!!

 

[ZBZB]

Use strategy builder in IB options trader to see the bid/ask of the spread and transmit the order.

 

[ajacobson]

More expensive, but consider using a floor broker if you can. You'll save on the fills in many cases.

 

[ZBZB]

If you do 500 stock options or 100 SPX then call the IB large order desk in Chicago. Number on IB website.