finance
Stock traders face new limits in the overnight session
Nasdaq and other market participants would reject orders outside the bands before they hit a thin overnight market. The filing says the safeguards are tailored to lighter trading and faster price moves after hours.
The proposal aims to catch outlier orders early in overnight trading, when liquidity is thinner and prices can swing harder. Exchanges would still be able to impose regulatory halts, but not an automatic overnight freeze.
- Overnight trading would get temporary price bands first.
- Automatic trading pauses are not part of the overnight launch.
- Exchanges would still be able to call regulatory halts.
- The rollout is designed in two phases, with a later redesign planned.
- Overnight stock traders would get a new set of rails in a federal notice from Nasdaq and other market participants
Overnight stock traders would get a new set of rails in a federal notice from Nasdaq and other market participants. The proposal would add temporary price band protections to the thin overnight session, so orders outside the limits could be blocked instead of racing through a market that can move on little volume. But the plan stops short of automatic trading pauses during those overnight hours.
The filing is the twenty-seventh amendment to the National Market System, or NMS, Plan to Address Extraordinary Market Volatility. It is meant to give the overnight market a cautious start, not a full stop, and it would leave primary listing exchanges with the power to call regulatory halts when they think the market needs one.
Thin markets, sharper moves
The logic behind the proposal is simple: overnight trading does not behave like the daytime session. Liquidity is thinner, prices can jump faster, and a single order can have more sway than it would when the market is deeper. The participants say that is why they are building the system in phases instead of rolling out one broad change at once.
The proposal also points to alternative trading systems, or ATSs, which already reject orders that fall outside their bands rather than automatically pausing trading. That model, the filing suggests, fits the overnight session better than a built-in pause-and-auction routine.
Bands first, pauses later
Under the plan, the first stage would cover the launch of overnight trading, which processors are preparing to begin on Dec. 6, 2026. A second-stage proposal would follow later, with enough time for implementation by the fourth quarter of 2027. That two-step rollout is meant to keep the market open while still putting limits around the wildest moves.
For brokerages, trading platforms and the investors who use 23/5 access, the practical difference is how a rough night gets handled. Orders outside the bands could be rejected, and exchanges would still be able to impose regulatory halts if needed, but there would not be an automatic overnight freeze built into the system.