According to ChainCatcher, Nasdaq’s 23-hour trading system (23/5) has been approved by the U.S. Securities and Exchange Commission (SEC), as shown in its Q1 2026 financial report and the filed Form 8-K. The system will officially launch on December 6, 2026. At that time, the U.S. stock market will be closed for only one hour daily (8:00 PM to 9:00 PM Eastern Time) for system settlement and data processing, with trading continuing continuously for the remaining 23 hours.
SEC Approves Nasdaq 23-Hour Trading System; Launch Set for December 6
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Summary
Nasdaq’s 23-hour trading system (23/5) has been approved by the SEC and will launch on December 6, 2026. The U.S. stock market will then operate 23 hours daily, closing only from 8:00 PM to 9:00 PM ET for system settlement. On-chain data shows growing interest in extended trading models. The change is expected to impact trading volume across major exchanges.
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