Nasdaq’s planned 23-hour trading day is aimed at Asia’s daytime flow, with ETFs at the center
Nasdaq plans to launch 23-hour-a-day, five-day-a-week stock trading on Dec. 6, 2026, after the U.S. Securities and Exchange Commission approved the rule change for 23/5 trading. The rollout still depends on whether market infrastructure, including the Securities Information Processor, is ready and whether related operating rules are in place. The added session would run from 9 p.m. to 4 a.m. Eastern Time, covering daytime hours in Asia and allowing investors there to trade U.S. stocks without waiting for the New York open. According to the article, the change is less about letting U.S. investors trade longer and more about pulling order flow back from overnight ATS venues, broker internalization systems and rival exchanges. Nasdaq’s own overnight data show trading is highly concentrated: out of roughly 11,300 U.S. tickers, only 1,403 traded overnight, and just 644 saw more than $10,000 in daily turnover. The top 15 instruments made up about 53% of overnight volume, with 12 ETFs and only three single stocks. That pattern suggests overnight trading is centered on macro risk transfer and price discovery in broad market products and mega-cap names, not broad equity research. The article also argues that extending trading hours raises infrastructure, staffing, compliance and market-making costs, while faster prices do not automatically mean better prices in a thinner market.








