December 6, 2026 U.S. Overnight-Market Expansion

Nasdaq Stock Market

Nasdaq currently expects to introduce a Night Session on Sunday, December 6, 2026, creating a 23-hour weekday structure on the Nasdaq Stock Market. The implementation remains subject to SIP readiness and applicable SEC rule changes.

The one-hour Monday–Thursday pause supports maintenance, processing and transition to the next trade date. The week begins directly with Sunday’s 9:00 PM Night Session. This is 23-hour weekday trading—not 24/7 trading.

Nasdaq implementation update — fee filing withdrawn

Nasdaq’s Night Session will still use a separate system environment from its Day Session, so member firms that participate must obtain separate Night Session connectivity. However, the August 28 SEC filing that proposed Night Session port pricing and introductory fee waivers was withdrawn on August 31, 2026.

• Supported Night Session connectivity products continue to include FIX Trading, OUCH, CORE FIX, OUCH Purge, FIX Purge and DROP ports.
• Night Session ports are scheduled for 9:00 PM–4:00 AM ET; Day Session ports remain separate and operate from 4:00 AM–8:00 PM ET on Business Days.
• Do not treat the previously proposed first-five-port fee waivers as effective. The withdrawal applies to the fee proposal, not to Nasdaq’s separate-port Night Session architecture.
• Nasdaq continues to describe the planned launch as on or about December 6, 2026. The Night Session remains subject to Equity Data Plan readiness and the additional rule filing required before operation begins.

SEC readiness roundtable — September 17

The SEC will hold a public Roundtable on Preparations for 24-Hour Trading on September 17, 2026. The agenda focuses on launch preparedness and the operational issues surrounding near-continuous U.S. equity trading, including exchange and broker-dealer readiness, overnight surveillance, clearance and settlement, investor protections, systems resiliency, market-data continuity, shortened maintenance windows and future market-structure steps.

• Preparedness: NYSE is represented on the panel examining launch readiness and what remains before broader overnight trading.
• Resiliency: Nasdaq and MEMX are represented on the panel covering systems readiness, Regulation SCI, failover, capacity, cybersecurity and overnight staffing.
• Next steps: 24X, Blue Ocean and MEMX are represented in the discussion of expected impacts and possible future expansion toward 24x7 trading.

This roundtable is a market-structure readiness event. It does not itself change the currently published December 6 launch schedules or session rules.

Official SEC roundtable agenda ↗

Nasdaq orders and trade dates

Nasdaq’s official FAQ says routable orders will be accepted. Several order types and attributes will not be available, including unpriced market orders, primary, market, midpoint and market-maker pegged orders, and orders tied to Nasdaq’s opening or closing crosses.

Orders still outstanding at 4:00 AM ET will be cancelled rather than automatically continuing into the subsequent session. Orders may be re-entered beginning at 4:00 AM.

Trades from 9:00 PM to midnight are reported with the next calendar day’s trade date. Trades from midnight through 8:00 PM use the current calendar day’s trade date.

24X National Exchange

24X National Exchange currently targets Sunday, December 6, 2026 for expansion of its exchange trading hours, subject to its stated remaining regulatory requirements. This is a target date, not an unconditional launch guarantee.

24X states that orders will not be accepted during the 8:00 PM–9:00 PM ET controlled transition/reset period.

Official 24X extended-hours FAQ ↗

Industry infrastructure

• NSCC clearing: DTCC states that NSCC launched 24x5 operations on June 28, 2026, operating from Sunday at 8:00 PM ET through Friday at 8:00 PM ET.
• Trade reporting: FINRA’s Trade Reporting Facilities are scheduled to expand on December 6, 2026, operating from Sunday at 9:00 PM ET through Friday at 8:00 PM ET, with a one-hour Monday–Thursday pause from 8:00 PM–9:00 PM ET, excluding holidays.
• Market data: The UTP SIP’s expanded transmission schedule is scheduled to take effect December 6, 2026 as part of the industry transition toward expanded weekday operation.

Implementation milestones

24X publishes the following as planned industry testing dates. They are not trading-launch dates.

• October 2, 2026
• October 16, 2026
• October 30, 2026
• November 6, 2026
• November 20, 2026
• December 4, 2026

NYSE Arca

NYSE Arca now plans to launch extended-hours trading on December 6, 2026, subject to SEC approvals, availability of the Securities Information Processors (SIPs), and implementation of DTCC modernization efforts.

The Overnight Session is planned for Sunday through Thursday evenings. Trades from 9:00 PM to midnight carry the following calendar day as the trade date; midnight-to-4:00 AM trades carry the same calendar day. The session begins with continuous trading rather than an opening auction, and NYSE Arca says it will accept Overnight Session orders starting at 8:59 PM ET. Static 20% Overnight LULD Price Bands are planned from 9:00 PM to 4:00 AM.

Official NYSE Extended-Hours FAQ ↗

MEMX 23×5 Trading

MEMX filed SR-MEMX-2026-28 on August 28, 2026, and the SEC published the immediately effective filing on September 9. MEMX’s current 23×5 FAQ targets December 6, 2026 for launch, subject to industry-readiness conditions and a subsequent MEMX filing confirming readiness before the Overnight Trading Session begins.

Overnight

9:00 PM–4:00 AM ET

Pre-Market

4:00 AM–9:30 AM ET

Regular

9:30 AM–4:00 PM ET

Post-Market

4:00 PM–8:00 PM ET

Daily pause

8:00 PM–9:00 PM ET

• All orders resting on the MEMX book at 8:00 PM are cancelled before the new trading day; order entry resumes at 9:00 PM.
• Orders still open at 4:00 AM are not automatically cancelled and may remain eligible through later sessions according to their instructions.
• Trades at or after 9:00 PM are assigned the following day’s trade date. MEMX’s FAQ shows 9:00 PM–11:59 PM trades using the next calendar day as trade date, while midnight–4:00 AM trades use that same calendar day.
• MEMX says all order types currently accepted in its Pre-Market Session will be accepted overnight; pegged orders in extended sessions will require a limit price.
• The filing covers equity securities and UTP exchange-traded products.

MEMX says the Overnight Trading Session will not begin until required Equity Data Plan/SIP readiness conditions are satisfied. A subsequent filing and Trader Alert will identify the implementation and go-live date.

See the MEMX 23×5 venue page →

Existing overnight ATS operation

Blue Ocean ATS: Blue Ocean is an existing alternative trading system, not a national exchange beginning overnight trading on December 6. Its documented overnight operation remains distinct from the upcoming exchange-level expansions: 8:00 PM–4:00 AM ET, Sunday through Thursday. Official Blue Ocean FAQ ↗