What is the correct way to price option spreads at the globex for options on futures? For instance the ES and its options have a tick increment of 0.25. So do the spreads have to conform to the same tick increment? The reason I ask is that in TWS, I see spreads being priced at increments of 0.05, however when I place such an order it just sits there. Its only when I bump it up to be a multiple of .25 that it gets filled. (Perhaps thats because I moved it too far off the mid and someone picked it up) But wanted to see what others have to say? Something akin to a Complex Order Book (that ISE & CBOE provide for stock options) would be helpful for these FOPs. IB customer support says that I should pick up the "CME Floor Based" feed, but I am not sure it that it even provides this information.