ChainCatcher reports that Nasdaq's 23-hour trading system (23/5) has won approval from the US Securities and Exchange Commission, per the exchange's first-quarter 2026 earnings report and its 8-K filing with the SEC. The regime officially goes live on December 6, 2026. From that date, US stock markets will trade continuously for 23 hours on each trading day, closing only between 20:00 and 21:00 Eastern Time — a one-hour window set aside for system clearing and data processing.
Nasdaq has won regulatory approval from the US Securities and Exchange Commission for its 23-hour trading plan, called 23/5, according to the exchange’s first-quarter 2026 earnings report and a related 8-K filing with the SEC.
The new schedule starts on December 6, 2026. After that, US equities will trade for 23 straight hours a day, with just a one-hour break from 20:00 to 21:00 Eastern Time set aside for system clearing and data processing.
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