2026-20600NoticeWallet

Cboe BYX Locks In Rules for Near-24/7 Trading Resumes

Published Date: 10/8/2026

Notice

Summary

Cboe BYX Exchange is updating its rules to handle trading pauses after big market drops now that trading hours are expanding to 23 hours a day, 5 days a week. This change affects traders and investors by ensuring smoother restarts after a Level 3 market-wide halt during these longer hours. The update kicks in right away, helping keep markets stable and confident even during wild swings.

Analyzed Economic Effects

3 provisions identified: 2 benefits, 0 costs, 1 mixed.

Level 3 Halts Resume No Earlier Than 4:00 a.m. ET

If a Level 3 market-wide circuit breaker halt occurs, trading on the Exchange will remain halted until 4:00 a.m. ET or later on the following trading day. This preserves the current resumption time even as some exchanges plan to extend hours to 23 hours per day beginning December 6, 2026.

Planned 23/5 Overnight Trading (9:00 p.m.–4:00 a.m.)

Several exchanges intend to offer overnight trading sessions from 9:00 p.m. ET to 4:00 a.m. ET starting December 6, 2026, expanding hours to 23 hours per day, 5 days per week. The Exchange notes it does not intend to implement 23/5 Trading at this time and raises that overnight hours may involve different liquidity and participation considerations.

Uniform Resumption Rules Across Exchanges

The Exchange states it coordinated with other self-regulatory organizations (SROs) and expects similar filings so that all markets will continue to resume trading no earlier than 4:00 a.m. ET after a Level 3 halt. The change is intended to keep resumption rules consistent across U.S. equity markets.

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Key Dates

Effective Date
Published Date
9/23/2026
10/8/2026

Department and Agencies

Department
Independent Agency
Agency
Securities and Exchange Commission
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