2026-19120NoticeWallet

Markets Trading 23 Hours a Day? Halt Rules Updated!

Published Date: 9/18/2026

Notice

Summary

MIAX PEARL is updating its rules to handle how trading restarts after a big market pause called a Level 3 circuit breaker. This change matches the new longer trading hours—23 hours a day, 5 days a week—so trading can resume smoothly and safely. Traders and investors will see these updates take effect right away, helping keep the market steady during wild swings.

Analyzed Economic Effects

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

Keep 4:00 a.m. Resumption After Level 3 Halt

If a Level 3 market-wide circuit breaker halt (a 20% S&P 500 decline) occurs, trading on MIAX Pearl will remain halted until 4:00 a.m. ET or later on the following trading day rather than reopening at 9:00 p.m. ET the same calendar day. This preserves the current cooling-off period even after exchanges expand to 23 hours per day, 5 days per week and will be implemented on December 6, 2026.

Harmonize Resumption Time Across Exchanges

MIAX Pearl's rule change codifies that all U.S. self-regulatory organizations will keep a uniform resumption time of 4:00 a.m. ET or later after a Level 3 halt, so markets will not diverge when some exchanges offer overnight sessions from 9:00 p.m. ET to 4:00 a.m. ET. The Exchange states other SROs intend to file similar changes to preserve consistent resumption rules.

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Key Dates

Published Date
Effective Date
9/18/2026
12/6/2026

Department and Agencies

Department
Independent Agency
Agency
Securities and Exchange Commission
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