US stock exchanges move toward all-night trading, adding an overnight session that runs from 9 p.m. to 4 a.m. ET starting December 6. Multiple exchanges are reported to be involved, extending current trading hours so the market does not fully close for several hours each night.
The change is presented as a response to shifting global demand, including growing foreign investor interest, and is also framed as competition with other markets that trade outside standard hours. While outlets agree on the basic timeline and time window, they highlight different considerations: some coverage emphasizes the move toward longer availability, while others point to potential drawbacks. Those concerns include whether liquidity will be sufficient during overnight hours and whether trading activity and risks may differ from regular sessions. At least one outlet also notes that historical trading volumes suggest institutional participation may be limited during night-time trading.
