Cboe EDGX Aligns Trade-Break Rule With Overnight Price Bands

Cboe EDGX has filed a rule change that would update its clearly erroneous execution process for overnight trading, following the SEC’s approval of Overnight Protected Bands under the limit up-limit down plan. The SEC published notice of the filing on October 6. EDGX filed the proposal as non-controversial and immediately effective, subject to its stated operative timing.

The market-wide plan for 23-hours-a-day, five-days-a-week trading adds temporary overnight price bands. The bands are initially set 20% above and below two reference points, according to the EDGX filing. The exchange’s proposal is designed to extend the current premise of its trade-break rule: when applicable price bands were available and correct at the time of an execution, the trade generally is not eligible for clearly erroneous review.

EDGX defines the relevant overnight protected hours as 9:00 p.m. to 4:00 a.m. Eastern Time. The exchange says other national securities exchanges and FINRA are expected to submit substantively identical changes, seeking consistent handling across venues.

Why it matters

As equities move toward broader overnight access, rules governing when a trade can be cancelled become more important. Participants trading during protected overnight hours should understand that executions inside operative bands may receive the same greater certainty against cancellation that applies during regular trading hours.

What to watch next

Watch for corresponding filings from other exchanges and FINRA, plus the rollout timetable for 23/5 trading and the overnight bands. The SEC can temporarily suspend the EDGX change within 60 days of filing.