2026-19125NoticeWallet

Big Board Goes 23/5: Resuming Trades After Market Meltdowns

Published Date: 9/18/2026

Notice

Summary

The New York Stock Exchange is updating its rules to handle trading restarts after a big market pause, called a Level 3 circuit breaker, now that trading hours have expanded to 23 hours a day, 5 days a week. This change helps keep trading smooth and safe during extreme market swings. Traders and investors will see these new rules take effect immediately, ensuring the market stays fair and orderly around the clock.

Analyzed Economic Effects

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

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

If a Level 3 market-wide circuit breaker (a 20% S&P 500 decline) occurs, the Exchange will halt trading and trading will not resume until 4:00 a.m. ET or later on the following trading day. This preserves the current cooling-off period even after some exchanges expand hours to 23 hours per day on December 6, 2026.

Overnight Trading Starts Dec 6, 2026 (Some Exchanges)

Several exchanges plan to offer new overnight trading sessions from 9:00 p.m. ET to 4:00 a.m. ET beginning December 6, 2026, though the NYSE does not intend to implement 23/5 trading at this time. The rule change clarifies that, despite that overnight expansion, a Level 3 halt will still require resumption no earlier than 4:00 a.m. ET the next trading day.

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Key Dates

Effective Date
Published Date
9/4/2026
9/18/2026

Department and Agencies

Department
Independent Agency
Agency
Securities and Exchange Commission
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