Cboe’s options rule change introduces GTH Only and GTH-and-RTH-only instructions, earlier queuing and session-specific quoting obligations, helping firms prevent orders from unintentionally rolling into the Curb session.
Cboe BZX plans to let members choose, in 30-minute increments, when a pre-market order becomes eligible to execute, while preserving time priority and extending existing acceptance restrictions to the later selected start.