Nasdaq Seeks Approval to Extend U.S. Trading Hours to 23

Nasdaq announced on December 16 that it will submit formal paperwork to the Securities and Exchange Commission seeking approval to expand trading on its U.S. stock venues to roughly 23 hours each weekday. The move would lengthen the current trading window from about 16 hours a day to nearly continuous trading, reshaping market rhythms that have governed equities activity for decades.

Under the filing, trading would be organized into two sessions separated by a one hour maintenance pause. A day session would run from 4:00 a.m. to 8:00 p.m. Eastern Time, folding in current premarket activity, the standard 9:30 a.m. opening, regular hours and the existing 4:00 p.m. close. A pause from 8:00 p.m. to 9:00 p.m. ET would allow clearing and maintenance, followed by a night session from 9:00 p.m. to 4:00 a.m. ET the next morning. The expanded week would begin Sunday at 9:00 p.m. ET and end Friday at 8:00 p.m. ET. Limit orders would remain available across both sessions as they are today during extended hours.

Nasdaq has publicly set a target to launch in the second half of 2026, contingent on SEC approval and coordinated upgrades across critical market infrastructure. That coordination is substantial. Consolidated price feeds, known as securities information processors, would need to extend their publishing windows. Clearing systems must support near continuous settlement. The Depository Trust and Clearing Corporation is preparing to expand its hours, though reported timelines differ, with some indications pointing to nonstop clearing by the second quarter of 2026 and others to the end of 2026.

The exchange framed the proposal as a way to broaden access to U.S. equities for investors in Asia and other regions that cannot trade during U.S. regular hours, and to keep U.S. venues competitive with foreign exchanges. Nasdaq also linked the change to its longer term interest in participating in markets that trade digital assets and to client demand that has already pushed some activity into overnight windows.

Market participants and analysts offered mixed reactions. Supporters say formalizing longer hours would mirror practices in futures and crypto markets and better serve global investors. Critics question whether liquidity will be sufficient outside traditional open and close periods, noting that volume is historically concentrated at the start and end of the trading day. Others warned that continuous trading will require robust contingency planning, new liquidity rules and clear protocols for stress events occurring overnight.

The proposal comes amid broader industry moves. A rival exchange plans extended hours of roughly 22 hours on weekdays, signaling an industry shift toward longer windows if regulators permit. Nasdaq’s filing will trigger an SEC review and consultations with market utilities and other exchanges. Implementation timing will hinge on regulatory approvals, the pace of SIP and clearing upgrades and readiness among broker dealers and market makers.

If approved and implemented, the expansion would represent one of the most significant structural changes to U.S. equity markets in recent memory, redistributing trading activity across all hours and forcing investors, regulators and infrastructure providers to rethink market surveillance, liquidity provision and settlement practices.