US markets to expand to 23-hour weekday trading on Dec. 6

SEC: The U.S. Securities and Exchange Commission is the federal agency responsible for regulating securities markets, protecting investors, and overseeing exchanges and market data systems. It has recently approved amendments to equity data plans supporting extended trading hours and hosted a roundtable on preparations for potential 24-hour trading. The agency signals that further expansion toward continuous trading remains under active consideration. US markets: U.S. equity markets encompass major exchanges such as Nasdaq and the New York Stock Exchange, serving as primary venues for trading stocks and other securities globally. These markets are expanding trading sessions to nearly continuous weekday hours to better serve international investors and align with evolving demand. The SEC has approved related infrastructure changes enabling this shift starting December 6. Market Infrastructure: Equity data processors have aligned on extended operating hours that will enable overnight trading sessions across major U.S. exchanges beginning in December. Regulatory Developments: The SEC hosted a roundtable on September 17 to discuss industry readiness for 24-hour equity trading, including surveillance, clearance, and investor protections.