Nasdaq will extend its US equities trading day to nearly 23 hours starting December 6, adding an overnight session that runs from 9 p.m. to 4 a.m. Eastern time. Combined with its existing 4 a.m. to 8 p.m. session, the exchange will be open five days a week with just a single one-hour gap, between 8 p.m. and 9 p.m., when no trading occurs at all.
The move follows Securities and Exchange Commission approval of Nasdaq's proposal in April. The SEC's own filing notice confirms the exchange's plan to extend trading in all National Market System stocks and select exchange-traded products to 23 hours a day, five days a week, pending final system readiness at the Depository Trust and Clearing Corporation and the securities information processor that consolidates market data.
What Changes for Traders
Market participants will need new order-entry ports specifically for the overnight session, and several familiar order types — including standard market orders and opening and closing auction orders — won't be available during those hours. The rollout effectively creates two distinct trading regimes on the same exchange: a conventional day session with the full range of order types, and a thinner overnight book aimed largely at institutional and international traders reacting to news outside standard US hours.
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Closing the Gap With Crypto Markets
The shift brings traditional equities markets a step closer to the always-on trading crypto exchanges have offered for over a decade, and it comes as retail brokerages have separately pushed toward round-the-clock access through tokenized stock products. Nasdaq's own framing acknowledges the competitive pressure: as capital increasingly moves through venues that never close, forcing US equities to sit idle for 16 hours a day risked leaving them structurally disadvantaged against faster-moving, always-open markets.
For now, the one-hour daily closure that remains is itself notable — a deliberate design choice preserving a narrow window for clearing and settlement processes that still assume a market close exists. Whether that gap eventually disappears entirely may depend on how smoothly the December launch handles its first real bout of overnight volatility.
