Cboe EDGX overnight trading rules will bar orders without a limit price from executing outside regular market hours. The change forms part of the exchange’s planned transition to 23-hour weekday trading, according to an SEC notice issued October 16, 2026.

Cboe EDGX filed the proposal on October 13 as a noncontroversial rule change. It became effective through the self-regulatory filing process, but operation remains tied to the exchange’s broader overnight-trading rollout.

Cboe EDGX overnight trading limits unpriced orders

The filing adds language stating that orders without a limit price cannot execute outside regular trading hours. Existing approved text already prevented most market orders from being accepted before the regular session, but it did not clearly address executions after the 4:00 p.m. close.

Cboe said extended sessions typically have lower liquidity and volume. An unpriced order could therefore execute far from the prevailing market price or an investor’s expectations. The rule aligns broadly with restrictions used by Nasdaq and NYSE Arca.

The clarification arrives as exchanges expand trading access beyond traditional hours. It differs from the default-management procedures in the recent CME Securities Clearing filing, which addressed clearing-member failures rather than equity order execution.

Cboe EDGX overnight trading clarifies order expiry

The second amendment changes how the rules describe Day Order expiration. An order submitted during the 8:55 p.m. queueing period or the 9:00 p.m.–4:00 a.m. overnight session will expire after regular trading on the business day associated with that overnight session.

The replacement removes the phrase “following trading day,” which could confuse orders entered after midnight. Cboe said the revision does not change operational handling; it makes the order lifecycle explicit within the 23×5 structure.

The SEC can temporarily suspend the rule within 60 days of filing if it determines further review is necessary. The process follows other recent market-structure work, including the SEC fund cross-trading proposal and the agency’s October 27 small-business rule review.

Sharron Kendi is a seasoned crypto market analyst and writer with over three years of experience decoding blockchain trends, price movements, and market dynamics. She holds a Bachelor’s Degree in Commerce (Finance) from Kenyatta University, blending a solid academic foundation with a sharp eye for technical analysis and a deep understanding of on-chain data. Her work delivers clear, data-driven insights that empower investors to navigate the fast-evolving digital asset space with confidence.