The only way to reduce your fees in the SPX as a customer is through the CBOE's frequent trade program explained here Frequent Trader Program (cboe.com) Basically if you are trading over 10,000 contracts a month, they will give you 3% back (with a higher rebate over 50,000 contracts.) There are also slight differences if you are labeled a professional (JBO etc). All rates explained here Cboe_FeeSchedule.pdf Unfortunately, renting a seat won't help you here. There may be some brokers that don't pass on these exchange fees, (someone mentioned First trade doesn't) but I don't know of any with certainty.