You mean like the June 49 calls are QQQFW and UQQFW!? The former is the regular one, the latter is the quarterly, which expires at the end of the month rather than the 3rd Friday. Whenever there are two symbols it means that there's some difference between the two such as one is normal and the other is an adjusted contract for corp. actions, or the expiration dates are different... By the way, the higher the volume the greater the liquidty so splitting up the contract just because of sheer volume makes no sense at all!