Effective trade date November 16, 2026, Cboe Options Exchange (C1) will extend its existing Curb trading session to trading days with an early Regular Trading Hours (RTH) close, specifically half-days and the day after Thanksgiving, for Global Trading Hours (GTH)-eligible multi-listed equity options.

Currently, C1 does not offer a Curb session on early-closing trading days. On the effective date, C1 will add a Curb session on half-days and the day after Thanksgiving for GTH-eligible multi-listed equity options only. On these days, RTH for these options will end at 1:00 p.m. ET, followed by a Curb session from 1:00 p.m. to 1:15 p.m. ET, the same 15-minute length as on regular trading days.

No other products are affected. RTH for all other options will continue to end at 1:15 p.m. ET with no Curb session. This includes GTH-eligible ETF options and Cboe proprietary index options.

This functionality will be available to test in the C1 certification environment on November 13, 2026, which is a C1 certification half day. The environment will be available for Curb Trading from 1:00 p.m. to 1:15 p.m. ET.