SEC Reviews Overnight Stock Trading Readiness
SEC officials examine overnight liquidity and market infrastructure as US equities move toward a 23-hour, five-day trading schedule.
Key Takeaways
- The SEC examined preparations for overnight stock trading at a September 17 roundtable, with the industry moving toward a 23-hour, five-day schedule.
- SEC staff data show that the ten busiest stocks accounted for 43.4% of overnight share volume in August, compared with 10.3% during regular hours.
Details
The US Securities and Exchange Commission held a roundtable on September 17, 2026 to examine how stock markets would handle longer trading hours, including overnight surveillance, settlement and shorter maintenance windows.
Commissioner Hester Peirce said the emerging schedule was 23 hours a day, five days a week. She pointed to thinner order books, wider spreads and the difficulty of fitting technology maintenance into a single hour. The extended schedule for consolidated market-data feeds is set to begin on December 6, she said.
A September 10 staff memorandum prepared for the event puts the liquidity question in perspective. Overnight trading averaged 0.9% of total National Market System share volume per trading day in August 2026. The ten most active stocks represented an average 43.4% of overnight share volume, versus 10.3% in regular trading. The study defines the overnight session as 8 p.m. to 4 a.m. Eastern Time.
Chairman Paul Atkins raised tokenization as a possible tool for managing securities inventories in real time. He said it could help reduce settlement failures and address difficulties locating shares for market-making activity. Atkins and Peirce both specified that their remarks reflected their own views.
Market Analysis
For tokenized-equity platforms, the discussion focuses attention on the services behind an extended trading session. Atkins said intermediaries would need to decide which services to offer overnight, including securities lending and prime brokerage. Those choices affect the ability to support trading when the main US session is closed. The roundtable addressed preparations and operational questions; the 23-hour, five-day model still leaves daily maintenance breaks and weekends outside that schedule.
Note: This article is for news reporting purposes only and does not constitute investment advice.
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