# 2026-22264: Markets May Soon Trade 23 Hours, But Circuit Breakers Need Rules

2026-22264, Self-Regulatory Organizations; MX2 LLC; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Amend Rule 11.23 Concerning the Resumption of Trading Following a Level 3 Market-Wide Circuit Breaker Halt in Connection With the Industry's Expansion of Trading Hours to 23 Hours per Day, 5 Days per Week, is a Federal Register notice from Securities and Exchange Commission published 2026-11-02, effective 2026-10-19; PRIA reads it as touching household money (as of 2026-11-04).

- Canonical: https://policyrisk.com/federal-register/2026-22264
- As of: 2026-11-04
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-22264
- Title: Self-Regulatory Organizations; MX2 LLC; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Amend Rule 11.23 Concerning the Resumption of Trading Following a Level 3 Market-Wide Circuit Breaker Halt in Connection With the Industry's Expansion of Trading Hours to 23 Hours per Day, 5 Days per Week
- Type: Notice
- Agencies: Securities and Exchange Commission
- Citation: 91 FR 69021
- Published: 2026-11-02
- Effective: 2026-10-19
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-11-04

## In one line

Markets May Soon Trade 23 Hours, But Circuit Breakers Need Rules

## Summary

MX2 is updating its rules to handle trading pauses better when the market drops a lot, now that trading hours are expanding to 23 hours a day, 5 days a week. This change affects traders and investors by making sure trading restarts smoothly after big market drops during these longer hours. The update kicks in right away, helping keep the market stable and confident even during overnight trading.

## Effects PRIA read

- Level 3 Halts Resume at 4:00 a.m. ET: benefit, medium. MX2 amended Rule 11.23 so that after a Level 3 market-wide circuit breaker halt, trading on the Exchange will remain halted until 4:00 a.m. Eastern Time on the following trading day. This change preserves the current resumption practice and prevents trading from reopening at 9:00 p.m. ET on the sam…
- Preserves Cooling-Off and Price Discovery: benefit, medium. By requiring that trading not resume before 4:00 a.m. ET after a Level 3 halt, the Exchange aims to preserve a longer cooling-off period so more institutional participants can take part and price discovery can occur in pre-market hours. The Exchange cited concerns that overnight sessions (9:00 p.m.…

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## Sources
- [2026-22264 on federalregister.gov](https://www.federalregister.gov/documents/2026/11/02/2026-22264/self-regulatory-organizations-mx2-llc-notice-of-filing-and-immediate-effectiveness-of-proposed-rule)
- [2026-22264 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-11-02/pdf/2026-22264.pdf)

## Related
- [Previous: 2026-22263, Self-Regulatory Organizations; NYSE National, Inc.; Notice of Filing and Immedi…](https://policyrisk.com/federal-register/2026-22263)
- [Next: 2026-22265, Self-Regulatory Organizations; NYSE American LLC; Notice of Filing and Immediat…](https://policyrisk.com/federal-register/2026-22265)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-22264 (as of 2026-11-04).