Bloomberg: US stocks may move towards 24/7 trading, all-weather market will face stress tests

BlockBeats news, September 28, according to Bloomberg, Nasdaq, the New York Stock Exchange (NYSE), and the London Stock Exchange (LSE) are planning to extend trading hours in the coming months, with the U.S. stock market potentially gradually moving toward a trading model of more than 23 hours a day, five days a week.

Among them, Nasdaq and NYSE Arca plan to launch overnight trading on December 6. Nasdaq intends to add a trading session from 21:00 to 4:00 the next day New York time, and NYSE Arca has a similar plan, while its main board trading hours will not be adjusted for now. The LSE plans to launch "LSE 24" in 2027, allowing certain securities to trade between 17:00 London time and 7:50 the next day.

Bloomberg noted that the expansion of U.S. stock trading hours is mainly driven by growing demand from overseas investors and competition from around-the-clock trading platforms such as cryptocurrencies and prediction markets. U.S. equity overnight trading volume currently accounts for only about 1% of total trading volume, but it has more than tripled in the 12 months through August 2026, with about 37% of overnight trading volume coming from non-U.S. investors.

However, market participants warned that extending trading hours could lead to insufficient liquidity during overnight sessions, wider bid-ask spreads, increased price volatility, and higher operational and monitoring costs for brokerages and market infrastructure. The U.S. SEC has approved Nasdaq's plan to extend trading hours and is discussing with market institutions how to ensure market order and liquidity under extended trading sessions.