Overview

CTA/UTP, NYSE Arca, Cboe EDGX, MEMX, and 24X have confirmed readiness to support 23×5 trading hours. Beginning December 6, 2026 (for the December 7, 2026, trading day), these venues will introduce a new Overnight Trading Session, extending the U.S. equity trading week to approximately 23 hours per day, five days per week.

The above exchanges will operate from 9:00 p.m. ET Sunday through 8:00 p.m. ET Friday, with a nightly maintenance pause Monday-Thursday from 8:00 p.m. to 9:00 p.m. ET. The gap from Friday 8:00 p.m. ET to Sunday 9:00 p.m. ET is the weekend market closure, not a nightly maintenance pause.

Trading Schedule

Session Interval (ET) dxFeed processing
Pre-market (Extended Early Hours)* 9:00 p.m.-4:00 a.m. (overnight segment)
4:00 a.m.-9:30 a.m. (morning segment)		 Processed as pre-market; both segments attributed to the next trading dayId
Regular 9:30 a.m.-4:00 p.m. Processed as regular trading hours
After-market (Late Hours) 4:00 p.m.-8:00 p.m. Processed as after-market
Maintenance pause (Mon-Thu nights) 8:00 p.m.-9:00 p.m. SIP unavailable; no real-time dissemination
Weekend closure Fri 8:00 p.m.-Sun 9:00 p.m. SIP unavailable; no real-time dissemination (not a nightly pause)

* For dxFeed consumers, pre-market is a single logical session spanning 9:00 p.m.–9:30 a.m. ET, consisting of the overnight and morning segments. Both segments are attributed to the following trading dayId for session attribution and daily statistics purposes.

Testing opportunities

CTA

Pre-Launch

CTA will make the production environment available for participant input in test symbols starting Sunday November 8, 2026.  During this pre-launch period, CTA will modify its Start of Day process to begin at approximately 8:55 pm, at which time connectivity and SOD messaging will begin for all symbols. 

Please refer to the FAQ for full details.

CTA Test symbols

#STOCK::=TYPE,SYMBOL,TRADING_HOURS

STOCK,MTEST/A,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ATEST/G,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/N,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZZZTA,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,PTEST/X,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,IGZ,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ATEST/B,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZTEST,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/I,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/Q,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZXIET,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/Y,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,CBO,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ATEST/Z,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/L,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,PTEST/A,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZZZTT,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,MTEST/B,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZVV,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/G,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)
STOCK,ATEST/H,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/O,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,PTEST/Y,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ATEST/C,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/J,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZZK,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,CTEST,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZZZTE,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/Z,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/M,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,PTEST/B,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZIEXT,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,PTEST/W,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,CBOpA,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,CBX,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ATEST/A,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/H,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZEXIT,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/P,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,PTEST/Z,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZZZTX,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,MTEST,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,NTEST/K,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ATEST/L,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,CTEST/A,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

STOCK,ZZZTS,NewYorkETH(de=2045;rt=–2045;0=p–21000930r09301600a16002000)

Nasdaq

Pre-Production Period

  • November 1, 2026

Order entry and trading of Nasdaq Test Symbols (ZXZZT, ZVZZT, and ZWZZT) will be available between 9 p.m. and 4 a.m. Market data will be broadcast for Nasdaq Test Symbols during the pre-production period.

NYSE ARCA

Beginning November 8, 2026, test symbols (NTEST, PTEST, ATEST) will be available for Production testing during the Overnight Session. 

Cboe EDGX and Cboe One

Parallel Production Period

Beginning the trade date of November 9, 2026, the following test symbols are supported in the EDGX production environment for the Overnight Trading Session. These test symbols will also appear on the Cboe One U.S. Equities feed:

  • ZBZX
  • ZTST

MEMX

MEMX Equities does not plan to make test symbols available in production for the Overnight Session before the December 6, 2026, go-live date. MEMX also does not participate in Customer Weekend Tests.

dxFeed plans to disseminate these symbols through its DEMO endpoint (demo.dxfeed.com:7300) to all consumers of the affected feeds.

Additional Information