23-Hour Trading to Start on Major Exchanges in December
Investors gain access to thousands of stocks outside standard market hours beginning December 6, 2026.
Updated on Oct. 22, 2026 in Investing
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Starting December 6, 2026, the Nasdaq and NYSE will move to a 23-hour trading schedule to facilitate round-the-clock market access. This change will allow investors to trade over 4,200 National Market System stocks between 9:00pm and 8:00pm the following day.
Why it matters
The shift reflects a significant increase in demand for off-hours trading as investors seek greater flexibility in managing their portfolios outside of traditional market hours. As trading windows expand, market participants should prepare for how extended activity might impact order execution and portfolio monitoring.
Overnight trading volume has surged 359% year-on-year to 144.6 million shares, accounting for 0.9% of total NMS share volume as of August 2026. Over 4,200 stocks currently participate in overnight sessions.
The players
Nasdaq
A major U.S. stock exchange that provides platforms for investors to buy and sell corporate equities.
NYSE
The New York Stock Exchange, a primary venue for listing and trading U.S.-based company stocks.
SEC
The U.S. Securities and Exchange Commission, which regulates markets to protect investors and maintain fair, orderly, and efficient trading.
London Stock Exchange
A major international exchange provider that is currently developing its own 24-hour trading capabilities.
The details
The new 23-hour schedule includes a nightly maintenance window, effectively pausing operations for one hour to ensure system stability. Trades placed between 9:00pm and midnight will be recorded under the next trading day's date, requiring investors to adjust their expectations for transaction settlement timelines. This structure creates distinct operational segments, including a dedicated Night Session, Pre-Market, Regular Market Hours, and Post-Market periods.
Timeline
August 2026 marked the period when overnight trading reached 0.9% of NMS volume.
September 17, 2026, saw the SEC host a roundtable regarding round-the-clock trading.
December 6, 2026, is the date the 23-hour trading schedule begins.
The London Stock Exchange expects to launch its LSE24 platform in the first half of 2027.
Money Landscape
The move to a 23-hour schedule marks a definitive shift toward continuous global market access, following discussions at the September SEC roundtable. This development signals a broader transition away from traditional market hours that have long defined the standard investment cycle.
Investors will soon have the ability to execute trades on thousands of stocks outside of regular hours, potentially allowing for faster reactions to overnight news. Those interested in off-hours trading should consult with a financial professional to discuss how this affects their order strategies and execution risk.
The takeaway
The move toward 23-hour trading creates new windows for activity but also requires investors to monitor trade date assignments carefully. Review your brokerage's updated trading policies before December 6 to understand how your orders will be handled during these new night sessions.
What happens next
The 23-hour trading schedule is set to launch on December 6, 2026, with the London Stock Exchange anticipating its own LSE24 platform launch in the first half of 2027.
Further reading
For more on navigating shifting market environments, visit Investing.
Source note: This article includes information reported by FinTech Global.
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Do you plan to increase your personal trading activity if markets remain open 23 hours daily?
