Nasdaq and NYSE Arca plan to start near round-the-clock stock trading at 9 p.m. Eastern time on Sunday, December 6, 2026, by adding a night session from 9 p.m. to 4 a.m. ET. Added to today's pre-market, regular and after-hours sessions, that makes 23 hours a day, five days a week, from 9 p.m. Sunday to 8 p.m. Friday, with a one-hour pause from 8 p.m. to 9 p.m. Monday through Thursday. So 24-hour stock trading is close, not literal. The date still depends on the securities information processors (SIPs), the systems that publish consolidated quotes and trades, being ready, and NYSE Arca also lists SEC approvals and DTCC's modernization work as conditions.

Overnight trading already exists through brokers. Robinhood's 24 Hour Market runs from Sunday 8 p.m. ET to Friday 8 p.m. ET on alternative trading systems (ATSs), electronic venues run by broker-dealers that act much like exchanges but are not exchanges, and Schwab offers 24/5 trading in over 1,300 stocks and ETFs on thinkorswim. What changes on December 6 is that registered exchanges join the night. You will still reach the new session only through a broker that offers it, and neither Robinhood's nor Schwab's help page, as checked on November 1, says whether its overnight orders will go to the new exchange sessions. For U.S. readers, 9 p.m. Eastern is 8 p.m. Central, 7 p.m. Mountain and 6 p.m. Pacific on standard time, which applies by then.

What is scheduled for December 6, and what it depends on

Nasdaq's notice to member firms states the December 6 date plainly. NYSE Arca, the only NYSE Group exchange that plans an overnight session at this time, makes it "subject to SEC approvals, the availability of the Securities Information Processors (SIPs), and the implementation of the Depository Trust and Clearing Corporation’s (DTCC) modernization efforts." Nasdaq's own FAQ is just as conditional. It calls December 6 the date the change is "currently expected," pending SIP readiness.

Much of the groundwork is already in place. At the SEC's roundtable on September 17, Commissioner Hester Peirce said the clearing corporation NSCC switched in June to a 24x5 model that runs from Sunday at 8 p.m. to Friday at 8 p.m., and that the Commission had approved the SIPs' longer schedule, "set to launch on December 6, 2026." Nasdaq's member notice lists a pre-production period beginning November 1, with three test symbols open from 9 p.m. to 4 a.m., and weekend test dates on November 6, November 20 and December 4. Nasdaq and NYSE Arca are not alone: the SEC has conditionally approved 23-hour trading on five exchanges, 24X, Cboe EDGX, MEMX, Nasdaq and NYSE Arca, according to a client alert from the law firm WilmerHale, with the approvals conditioned on, among other things, the SIPs being ready.

Some things do not change. The 9:30 a.m. to 4 p.m. session keeps its opening and closing auctions, which Nasdaq says "will continue to set the prices" across all its hours, and NYSE Arca will keep publishing its official closing price after the 4 p.m. closing auction. FINRA's investor guide notes that the 4 p.m. prices remain the official closes regardless of what happens after hours, and that investment funds use them to value their holdings. Options are not part of the launch: Nasdaq's options exchanges keep their current schedules, and NYSE says only that it has filed for extended options hours.

The two night sessions, rule by rule

Both exchanges reach the same 23-hour week, but their published FAQs answer different questions. Where one is silent, the table says so instead of guessing.

Night-session rules published by Nasdaq and NYSE Arca (times ET)
RuleNasdaqNYSE Arca
New session9 p.m. to 4 a.m., starting Sunday eveningOvernight Session, 9 p.m. to 4 a.m., Sunday through Thursday evenings
Rest of the dayCurrent 4 a.m. to 8 p.m. hours, no substantive changeEarly 4 a.m. to 9:30 a.m., Core 9:30 a.m. to 4 p.m., Late 4 p.m. to 8 p.m.
How the session opensNot stated in the FAQNo opening auction; continuous trading from 9 p.m.; orders accepted from 8:59 p.m.
Market ordersNot accepted; limit orders are, except pegs and orders for the opening and closing crossesNot covered in the FAQ
Night orders still open at 4 a.m.Cancelled; can be re-entered at 4 a.m.Not covered in the FAQ; overnight orders carry their own session identifier
Trade date, 9 p.m. to midnightNext trading dayFollowing calendar day
Trade date, midnight to 4 a.m.Current daySame calendar day
Price protectionStatic bands 20% beyond the reference prices, at least $3.00 from the reference ($1.00 for stocks under $1.00)Static 20% Overnight Price Bands under the amended limit up-limit down (LULD) plan
Holiday from Monday to ThursdayTrading starts at 9 p.m. on the holiday eveningLate Session ends the evening before; next Overnight Session starts at 9 p.m. on the holiday evening
Who connects directlyMembers, through new order-entry portsOnly U.S. broker-dealers that are NYSE Arca members

Two rows matter most for an ordinary order. Nasdaq will not take market orders at night at all, and it cancels every order entered between 9 p.m. and 4 a.m. that is still working at 4 a.m. That is a different life cycle from the Day and good-'til-canceled labels on most order tickets, so read your broker's confirmation rather than assuming a GTC order rides through the night. WilmerHale reports that all five exchanges planning overnight sessions intend to accept only orders with a limit price, which fills the gap in NYSE's FAQ.

The price bands are wide. In an assumed example where both reference prices are $50, the band runs from $40 to $60; for a $10 stock on Nasdaq, 20% would be only $2, so the $3.00 minimum sets the band at $7 to $13. That is wider than the ATS band in Robinhood's own help-page example, where a $10 stock gets $8 to $12, set from its price before 8 p.m. A stock can move a long way inside the exchange limits on a thin night.

Which day a night trade belongs to

The trade-date rule is the one most likely to surprise an investor who watches the calendar instead of the clock. On both exchanges a fill between 9 p.m. and midnight takes the next day's trade date, while a fill between midnight and 4 a.m. keeps the calendar date it happens on. Settlement follows the trade date. Since May 28, 2024, most U.S. stock trades settle one business day after the trade date, the T+1 cycle, and NYSE's FAQ spells out the chain for the late-evening hours: those trades go to DTCC with the next calendar date as their clearing date, "for settlement one day thereafter."

Trade and settlement dates for example fills around launch and the first holidays (times ET)
FillTrade dateRegular-way settlementWhat decides it
Sun, Dec 6, 9:30 p.m.Mon, Dec 7Tue, Dec 8First night session; before midnight, so the next day
Mon, Dec 7, 2:00 a.m.Mon, Dec 7Tue, Dec 8After midnight, so the same calendar day
Mon, Dec 7, 7:30 p.m.Mon, Dec 7Tue, Dec 8Late session, unchanged
Mon, Dec 7, 9:15 p.m.Tue, Dec 8Wed, Dec 9Monday's night session belongs to Tuesday
Thu, Dec 24, 4:30 p.m., NYSE ArcaThu, Dec 24Mon, Dec 28Regular session closes early at 1 p.m., NYSE Arca's late session at 5 p.m.; Friday is Christmas Day
Mon, Jan 18, 2027, 9:30 p.m., NasdaqTue, Jan 19Wed, Jan 20Martin Luther King Jr. Day; Nasdaq's Monday-holiday example starts trading at 9 p.m. on the holiday

The last row also means no Sunday-evening session on January 17, 2027, if Nasdaq follows its own example. The two holiday weekends right after launch are less clear. Christmas Day 2026 and New Year's Day 2027 both fall on a Friday, and both exchanges' worked examples use holidays from Monday to Thursday. NYSE's general rule, written for holidays from Monday to Friday, restarts trading at 9 p.m. on the holiday evening, yet its overnight sessions run only Sunday through Thursday evenings, and neither FAQ walks through a Friday holiday. Treat your broker's holiday notice as the final word for those two weekends.

The same clock reaches the dividend cutoff. Investor.gov states the rule simply: if you buy a stock on its ex-dividend date or after, you will not receive the next dividend. By the same trade-date rule, a purchase filled at 9:15 p.m. on the evening before the ex-date would carry the ex-date as its trade date and so come without the dividend, and Nasdaq says that, pending SEC approval, certain dividends take effect when trading starts at 9 p.m. Neither exchange's FAQ works through this exact case, so confirm the treatment with your broker. Under a Nasdaq rule set to become operative on December 6, some events, including splits, spin-offs and dividends worth 25% or more of the prior official close, are halted from before 9 p.m. on the evening before the effective date until 8 a.m. on the effective date. If you hold a stock with an ex-dividend date or a corporate action coming up, check whether a halt will freeze your night order. Selling at night to raise cash works the same way: settlement follows the trade date in the table, though your broker sets when the proceeds can actually be withdrawn.

How thin the night market is today

The exchanges are stepping into a market that already exists on ATSs, and it is small. SEC staff published a data memo before the roundtable, counting each trade date from 8 p.m. to 8 p.m. In August 2026 the overnight hours carried 0.9% of all share volume in NMS stocks, which in general means stocks listed on a national securities exchange, and 0.8% of dollar volume. Average daily volume was 144.6 million shares, down 27% from July but up 359% from a year earlier, and the average value traded was $7.4 billion a day.

Concentration of trading, overnight session vs regular hours, August 2026 (SEC staff data; each session's top list is drawn separately)
Measure (August 2026)Overnight sessionRegular trading hours
Ten most active stocks, share of the session's share volume43.4%10.3%
Ten most active stocks, share of the session's dollar volume50.7%21.1%
Top 100 stocks, share of the session's share volume (from the staff's chart)82.0%34.0%

Overnight, the ten busiest stocks account for more than four times the share of volume that the ten busiest take in regular hours (43.4% against 10.3%), and the staff found that the two top-ten lists shared only about four names a day by dollar volume. Breadth is real, with 4,208 stocks recording at least one overnight trade on an average trade date in August, but the 100 busiest names took 82.0% of the night's share volume. That is why FINRA's warning that an extended-hours order may be filled only partly or not at all, and not always at a competitive price, is worth taking literally. Schwab's own disclosure adds that limited liquidity outside regular hours can mean wider spreads between bid and ask. Unless your stock is one of the night's favorites, the bid-ask spread can be a real cost of trading it at 1 a.m.

Two details from the memo matter for December. On a typical August trade date, staff counted 21.2% of overnight ATS share volume in the 8 p.m. to 9 p.m. hour, the hour the SIPs and the exchanges plan to pause Monday through Thursday. And as the memo describes the current setup, Sunday-evening trades between 8 p.m. and midnight are reported to FINRA but withheld from the public tape, because that window counts as a non-business day. From December 6, FINRA's trade reporting facilities are due to run from 9 p.m. Sunday to 8 p.m. Friday; as WilmerHale describes FINRA's rule filing, that would allow real-time public reporting of off-exchange overnight trades while the SIPs are operating. NYSE says overnight trades will carry the same 'T' extended-hours code as its early and late sessions.

The last time overnight trading broke

Extended-hours trading has existed on certain ATSs for several years, as Peirce noted at the roundtable, and WilmerHale lists four that trade overnight now: Blue Ocean ATS, Bruce ATS, IBKR Eos ATS and MOON ATS. Blue Ocean carries the cautionary tale. On the afternoon of August 5, 2024, Korean time, its operator, Blue Ocean Technologies, shut down the matching engine, citing an unexpected surge in trade volume. Korea's Financial Supervisory Service counted orders worth 630 billion won cancelled across 90,000 accounts in Korea, with gains and losses on them nullified, The Korea Herald reported. Korean brokerages suspended their daytime U.S. trading service on August 16, 2024 and restarted it in November 2025, after a 15-month suspension, with Bruce and MOON signed as backups, according to The Korea Times.

December 6 does not make that kind of failure impossible. It adds exchange venues to the night, with static price bands and trades sent to the public tape. Whether a bad overnight fill can be reviewed afterward is less settled. NYSE's FAQ says that, subject to regulatory approval, reviews of clearly erroneous executions will generally not be available on NYSE Arca in the Overnight Session when correct price bands are in place. WilmerHale describes the exchanges as planning to apply the clearly erroneous standards they now use outside the 9:30 a.m. to 4 p.m. session. Until the final rules settle it, the limit price on your order is the protection you control.

Korea also shows who the hours suit. The Korea Times, reporting in November 2025, gave the regular U.S. session as 11:30 p.m. to 6 a.m. Korea time, a 14-hour gap that holds while U.S. clocks are on standard time, as they are from November 1, 2026 under NIST's daylight saving schedule. On that gap the 9 p.m. to 4 a.m. ET session runs from 11 a.m. to 6 p.m. in Seoul. Foreign accounts supplied about 37% of overnight share volume in the second quarter of 2026, by the SEC staff's count, a higher proportion than in any other session.

What the night session is good for, and what it is not

Read together, the SEC numbers and FINRA's warnings point one way: the night session is mainly a way to react to news while the day market is shut, not a place to expect better prices. Only U.S. broker-dealers that are members of Nasdaq or NYSE Arca can trade there directly, and retail investors reach it through one. FINRA notes that brokers may limit the hours, venues and products, accept only limit orders, set their own policy on cancelling or carrying over unfilled orders, or skip extended hours altogether. Schwab's current 24/5 list shows how selective that can be: all S&P 500, Nasdaq 100 and Dow 30 stocks plus over 600 ETFs.

For a single night order, three limits stack up: it must carry a limit price, a thin stock can fill partly or not at all, and on Nasdaq it is cancelled at 4 a.m. A fourth point is easy to miss: a 2 a.m. print is not the price of record. Nasdaq says trading must be as fair and orderly at 2:00 a.m. as at 2:00 p.m., which is the goal, but the official close still comes from the 4 p.m. auction, and FINRA warns that the next morning's opening can differ from what traded overnight.

The people who may gain most are investors in time zones like Korea's, where the session falls in the working day, as the Seoul hours above show, and anyone who wants to answer an overnight shock without waiting for the 4 a.m. pre-market. For a U.S. investor who holds index funds or a handful of dividend stocks, December 6 changes little beyond the trade-date rule shown in the table above.

Sources

Editorial note

This article was prepared with the help of AI tools and checked against the sources listed above on 2026-11-01. Worked examples are illustrative unless a source is cited. Read our editorial standards, or tell us if you spot an error.