Quote from igotbadbeat:
Wow, this is exactly the answer I was looking for. It still doesn't clear up with Nexis Traders don't have their 7 though...
There are two possibilities. One, they are a member of the CBOE. Or two, they are a retail firm disguised as a prop. I know several of these. They are set up as an LLC in retail account with their own capital. there are quite a few firms that do this to escape the regulatory issues.