To complement CBOE's flagship SPX contract, which features AM settlement, CBOE also offers S&P 500 Index options with PM settlement. SPXpm options can be used by investors with end-of-day reporting needs, as well as those who wish to trade in and out of positions on Expiration Friday. In addition, SPXpm options trade on CBOE's Hybrid Trading System, allowing investors to choose electronic or open-outcry trading.
Beginning on Thursday, October 1, 2015, the trading hours for options on SPXpm begin at 2:00 a.m. Central time (Chicago time). Please visit the Extended Trading Hours webpage for more details.