Anybody think they can surprise me with an options trading firm that has an office in Chicago that I've never heard of? I'm talking about ones that pay a salary and not one in which you have to bring in your own capital. Examples include: Peak 6, CTC, Optiver, Group 1, etc... Less well known ones include XR Trading, Toro Capital, etc.. I've heard of almost any firm you can think of but would like to know if I'm missing any. Thanks!