Cboe Revives Curb Trading with Global Hours Overhaul
Published Date: 10/13/2026
Notice
Summary
Cboe Exchange is updating its trading rules to make global and curb trading hours more flexible and clear. Traders can now pick new order types for specific sessions, and trading times will start at set hours to keep things smooth. These changes kick in right away and help traders better manage their orders during different market hours.
Analyzed Economic Effects
4 provisions identified: 3 benefits, 1 costs, 0 mixed.
DPM opening-quote duty extended
Designated Primary Market-Makers (DPMs) appointed for a class in GTH must enter opening quotes for the GTH session in series that are not open for lack of a quote, in addition to the existing RTH opening-quote obligation. This obligation does not apply to Curb because there is no opening rotation for Curb.
New GTH-only order options
Traders (Users) can use two new order instructions called "GTH Only" and "GTH and RTH Only" to limit when an order is eligible to trade. The rules explain what happens to Day, GTC, and GTD orders at session boundaries (for example: a GTH Only Day order entered in the overnight GTH portion would be cancelled at the end of GTH at 9:25 a.m.).
Earlier Queuing and Entry Windows
The Exchange may accept orders into the GTH Queuing Book no earlier than 6:00 p.m. (previous day) for index options and no earlier than 6:00 a.m. for all other classes, and will align order-entry times in Rule 5.7 to the same floors. The opening-auction-update dissemination time is also set to begin no earlier than those same times so updates cover the full Queuing Period.
Curb session available on half-days
On trading days with shortened Regular Trading Hours (for example, a half-day where RTH runs 9:30 a.m. to 1:00 p.m.), the Global Trading Hours session will occur before the shortened RTH, RTH will run during the shortened hours designated by the Exchange, and the Curb session will commence at the end of the shortened RTH and continue for 15 minutes (for example, 1:00 p.m. to 1:15 p.m.).
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