Options on most underlyings close when the market closes at 3:00 pm Central Time (Chicago Time). However, there are a handful of symbols that trade until 3:15 pm Central Time, or 15-minutes after the equity markets close (3:00 pm Central).
Options on the following symbols trade until 3:15 pm Central Time (Chicago time):
AUM, AUX, BACD, BPX, BRB, BSZ, BVZ, CDD, CITD, DBA, DBB, DBC, DBO, DBS, DIA, DJX, EEM, EFA, EUI, EUU, GAZ, GBP, GSSD, IWM, IWN, IWO, IWV, JJC, JPMD, KBE, KRE, MDY, MLPN, MNX, MOO, MSTD, NDO, NDX, NZD, OEF, OEX, OIL, PZO, QQQ, RUT, RVX, SFC, SKA, SLX, SPX, SPXPM, SPY, SVXY, UNG, UUP, UVXY, VIIX, VIX, VIXM, VIXY, VXEEM, VXST, VXXB, VXZ, XEO, XHB, XLB, XLE, XLF, XLI, XLK, XLP, XLU, XLV, XLY, XME, XRT, XSP, XSP-AM, & YUK
Exception for Cash-Settled Indices
Day of expiration options for NDX (weeklys), RUT (weeklys), SPX (weeklys), OEX and XEO stop trading at 3:00 pm.