Bloomberg reported that Nasdaq, the New York Stock Exchange and the London Stock Exchange are moving to extend trading hours, a shift that could push the U.S. equity market closer to five-day trading schedules that run for more than 23 hours a day. Nasdaq and NYSE Arca are planning to launch overnight trading on Dec. 6, with Nasdaq proposing an added session from 9:00 p.m. to 4:00 a.m. New York time. NYSE Arca has a similar plan, while regular main-board hours are not set to change.
The London Stock Exchange is also preparing a longer-hours model. Its planned "LSE 24" service, due in 2027, would allow some securities to trade between 5:00 p.m. and 7:50 a.m. London time. Bloomberg said the push is being driven by rising demand from overseas investors and competitive pressure from round-the-clock venues such as crypto markets and prediction platforms. Overnight U.S. stock trading still accounts for only about 1% of total volume, but it more than tripled in the 12 months through August 2026, with roughly 37% of that activity coming from non-U.S. investors. Market participants have warned that longer hours could bring thinner liquidity, wider spreads, sharper price swings, and higher operating and surveillance costs. The U.S. Securities and Exchange Commission has already approved Nasdaq’s proposal and is discussing market-order and liquidity safeguards with industry participants.
Bloomberg reported that Nasdaq, the New York Stock Exchange (NYSE), and the London Stock Exchange (LSE) are preparing to extend trading hours over the coming months, a move that could gradually push the U.S. stock market toward a five-day schedule with more than 23 hours of trading each day.
Exchanges lay out longer-hour plans
Nasdaq and NYSE Arca plan to start overnight trading on Dec. 6. Nasdaq is proposing an additional session running from 9:00 p.m. to 4:00 a.m. New York time. NYSE Arca has outlined a similar plan, while trading hours for its main board are not being changed for now.
The LSE is on a later timeline. It plans to launch "LSE 24" in 2027, allowing some securities to trade between 5:00 p.m. and 7:50 a.m. London time.
What is driving the push
According to Bloomberg, the expansion of U.S. stock trading hours is being driven mainly by rising demand from overseas investors and competition from round-the-clock platforms, including crypto and prediction markets.
Overnight trading in U.S. equities currently makes up only about 1% of total trading volume. Still, it grew by more than threefold in the 12 months through August 2026. About 37% of overnight trading volume came from investors outside the United States.
Liquidity and market structure concerns
Market participants warned that longer trading hours could create thinner liquidity during overnight sessions, wider bid-ask spreads, stronger price volatility, and higher operating and monitoring costs for brokerages and market infrastructure providers.
The U.S. Securities and Exchange Commission has approved Nasdaq’s plan to extend trading hours and is discussing with market institutions how to maintain market order and liquidity during those longer sessions.
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