Nasdaq announced its "Global Trading Hours" initiative will officially launch on December 6, 2026, ushering in an era where US stocks will trade 23 hours a day, five days a week, with only a one-hour closure between 8:00 p.m. and 9:00 p.m. Eastern Time. The US Securities and Exchange Commission approved the relevant proposal in April, with implementation pending system upgrades to the DTCC clearing system and SIP infrastructure. This reform reflects a fundamental shift in global investment demand, with foreign holdings of US stocks reaching $17 trillion. Nasdaq is further positioning itself in tokenized securities, having received SEC approval and partnered with Kraken to build a trading gateway, targeting a 2027 launch. Major global exchanges including the New York Stock Exchange, Cboe, and the London Stock Exchange are simultaneously advancing round-the-clock trading, signaling that 24-hour trading has become an emerging industry trend.
US stock market trading rules are about to undergo a landmark transformation. Nasdaq has officially confirmed that its new "Global Trading Hours" initiative will launch on December 6, 2026, ushering in a new era where US stocks will trade 23 hours a day, five days a week, with only a one-hour daily closure. This decision will not only reshape trading habits for global investors but is also viewed as the critical first step in Nasdaq's plan to build a next-generation securities trading architecture.
US Securities and Exchange Commission (SEC) Chairman Paul Atkins confirmed in a recent interview with Yahoo Finance that the SEC will initiate a study this fall to explore how to advance a 23-hour, five-day-a-week trading system for US stocks. Atkins revealed that the SEC has scheduled a roundtable discussion for September 17 to delve into the round-the-clock trading system and related supporting measures, demonstrating the regulatory body's high level of attention to this transformation.
In fact, the SEC had already approved Nasdaq's "Global Trading Hours" proposal on April 10 of this year. However, for the new system to officially take effect, it still awaits the Depository Trust & Clearing Corporation (DTCC) to complete updates to its clearing system, and the Securities Information Processor (SIP) to finish overnight system upgrades. Market expectations suggest that as the technical infrastructure gradually falls into place, the December 6 launch timeline should be achievable.
How Will the 23-Hour Trading System Operate?
According to Nasdaq's plan, the new trading system will divide each trading day into two sessions: a day session and an overnight session. The day session will run from 4:00 a.m. to 8:00 p.m. Eastern Time, encompassing traditional pre-market trading, regular trading hours, and after-hours trading. The overnight session will begin at 9:00 p.m. and continue until 4:00 a.m. the following day. The period between 8:00 p.m. and 9:00 p.m., bridging the day and overnight sessions, will be the only daily market closure.
This brief one-hour closure is not intended as a break for traders but is reserved for critical system tasks. According to Nasdaq, this window will be used for system maintenance, stress testing, and processing corporate actions such as dividend payments and stock splits that need to take effect the following day. From a weekly trading cycle perspective, trading will commence at 9:00 p.m. Sunday evening and continue uninterrupted until 8:00 p.m. Friday evening, creating a five-day, 23-hour-per-day continuous trading pattern.
To mitigate potential risks arising from overnight trading, Nasdaq has also designed protective mechanisms. Overnight trading will employ a static price band mechanism, generally using a 20% band above and below the official closing price as a price limit. Any orders exceeding this range will be directly rejected by the system. Furthermore, in the event of significant corporate actions such as stock splits, reverse stock splits, SPAC de-listings, or ticker symbol changes, trading in the relevant stocks will be halted before the overnight session begins and will resume during the next morning's regular trading session to maintain market order.
However, market participants also caution that the overnight session may face challenges such as lower trading volumes, insufficient liquidity, and wider bid-ask spreads. Additionally, if major news is released overnight, stock prices could react immediately during the lower-liquidity overnight session, increasing the risk of price volatility. The market acceptance and actual operational dynamics after the new system's official launch remain to be seen.
Global Investment Demand Shifts as Foreign Holdings of US Stocks Reach $17 Trillion
Behind Nasdaq's push for this bold reform lies a fundamental shift in global investment demand. Chuck Mack, Senior Vice President of Nasdaq North American Markets, stated that this reform is not merely about extending trading hours but aims to expand opportunities for global investors to participate in the US stock market, allowing investors across different time zones to execute trades at their convenience while maintaining market trust and trading order.
Mack pointed out that since 2019, the scale of foreign investor holdings of US stocks has surged by 97%, reaching an estimated $17 trillion (approximately NT$548 trillion) by mid-2024. With the rapid proliferation of mobile trading platforms and the increasing interconnectedness of global markets, the market has been gradually moving towards round-the-clock operation, and trading systems must keep pace with changes in investor usage habits. He emphasized that the new system is not intended to replace the traditional regular trading hours of 9:30 a.m. to 4:00 p.m. Eastern Time but rather to allow investors in different time zones, such as those in Asia and Europe, to respond to market information more promptly.
Tokenized Securities: Nasdaq's Next Major Strategic Move
Extending trading hours is only the first step in Nasdaq's overall strategy. The deeper, more profound plan lies in tokenized securities. The SEC approved the relevant proposal in March of this year, with the scope covering Russell 1000 Index constituents, as well as ETFs linked to the S&P 500 and Nasdaq-100 Index.
According to the plan, eligible stocks and ETFs may, in the future, opt to settle in the form of blockchain tokens. These tokens will share the same ticker symbol, price, and shareholder rights as traditional stocks, introducing a new trading and settlement method while maintaining the existing market framework. The first tokenized trades could potentially commence as soon as the Depository Trust Company (DTC) completes its system updates.
Nasdaq's ambitions extend further. It has partnered with cryptocurrency exchange Kraken to jointly build a tokenized securities gateway, connecting on-chain and off-chain liquidity through xStocks, with a target launch in the first half of 2027. From this sequence, Nasdaq's strategic roadmap becomes clear: first compress the settlement cycle from T+2 to T+1, then advance 23-hour trading, and finally gradually integrate tokenized securities, step-by-step establishing a next-generation securities trading architecture.
Global Exchanges Race to Deploy Round-the-Clock Trading
The 23-hour trading initiative is not Nasdaq's solo act. Major global exchanges are simultaneously advancing towards round-the-clock trading, each at different stages of progress:
From the US to Europe, from traditional exchanges to emerging trading platforms, round-the-clock trading is rapidly becoming a new trend in global markets. For investors in Taiwan, once the new system is implemented, they will no longer need to stay up late to monitor the US market and can comfortably participate in US stock trading during Asian daytime hours. However, potential challenges such as overnight liquidity, price volatility, and information asymmetry are also worth investors' close attention. As the December 6 launch date draws near, this major transformation of the US stock trading system is just beginning to unfold.