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Cboe EDGX is extending its trading hours to 23 hours per day, five days per week by adding a new Overnight Trading Session running from 9:00 p.m. to 4:00 a.m., driven by surging pre-market volume (up 404% since 2022) and demand from retail investors in Asia-Pacific markets. The SEC has granted accelerated approval, meaning this is not a procedural step — the rule change is fully approved and legally effective, though actual overnight trading cannot begin until EDGX files a separate confirmation that the consolidated tape (SIP) infrastructure is ready to support overnight data dissemination. For market participants, this means EDGX will eventually join 24X, NYSE Arca, and Nasdaq in offering regulated overnight equity trading, creating a fourth major exchange venue competing for order flow during hours previously dominated by ATSs and foreign markets.
IEX RELEVANT Cboe EDGX's SEC-approved 23x5 trading framework intensifies competitive pressure on IEX to consider whether its own extended-hours strategy is adequate, as a growing share of equity order flow — particularly from retail and international investors — may migrate to regulated overnight venues where IEX currently has no presence, potentially eroding IEX's overall market share and relevance even during regular trading hours if broker routing relationships shift toward overnight-capable exchanges.
Proposal history
2026-04-15
notice of filing
Notice of Filing of a Proposed Rule Change To Amend Its Rules To Enable the Exchange To O…
🔵 IEX Competitive Intel
Nasdaq is making a minor technical rule change to manage the transition between its new Night Session (9pm–4am ET) and Day Session (4am–8pm ET) as part of its previously approved 23-hours-a-day, 5-days-a-week trading expansion. Specifically, it tweaks order cancellation and session timing language from 'as of 4:00 a.m.' to 'just prior to 4:00 a.m.' to avoid sending overlapping quote data to the SIP during the brief handoff window. This took effect immediately upon filing with no SEC review required — it's a procedural housekeeping rule that supports the much larger 23/5 trading initiative already approved in April 2026. In practice, nothing material changes for market participants beyond clarifying that Night Session orders will be canceled a split second before 4am rather than exactly at 4am.
IEX RELEVANT This is a direct operational step in Nasdaq's rollout of 23/5 extended-hours equity trading, a competitive development that IEX must monitor and potentially respond to as extended-hours trading becomes an industry standard that could attract order flow away from venues not offering overnight sessions.
NSCC (the central clearinghouse for U.S. equity trades) is expanding its operating hours to a 24x5 model — running from Sunday 8pm through Friday 8pm — to support the industry's push toward extended and overnight equity trading. The SEC has approved this rule change, meaning it will take effect June 28, 2026, removing a key infrastructure barrier that had been blocking exchanges and ATSs from offering fully cleared overnight trading sessions. In practice, this clears the way for exchanges like NYSE Arca, 24X, Cboe EDGX, and Nasdaq to actually launch their previously approved or announced overnight trading sessions, since NSCC clearing availability was a stated precondition for the SIPs' extended hours plan amendments as well.
IEX RELEVANT NSCC's approval of 24x5 clearing removes a critical infrastructure prerequisite for competitor exchanges to launch overnight trading sessions, meaning IEX will need to evaluate whether and how to participate in extended hours trading to avoid ceding market share to NYSE Arca, Cboe EDGX, Nasdaq, and 24X as overnight equity trading becomes a mainstream competitive battleground.
Proposal history
2026-04-16
notice of filing
Notice of Filing of Proposed Rule Change Concerning NSCC's Ability To Support Industry Ef…
IEX is updating its rulebook to add Texas Stock Exchange (TXSE) to the list of away trading centers it routes orders to, and to specify SIP data as the primary market data source for TXSE quotes, ahead of TXSE's planned July 2026 launch. This is a mandatory housekeeping update — under Reg NMS, IEX is legally required to route to protected quotations on any registered national securities exchange, so adding TXSE is not discretionary. The rule change took effect immediately upon filing and simply ensures IEX's rules are accurate before TXSE goes live; nothing changes for market participants in terms of how orders are handled today.
IEX RELEVANT TXSE's launch as a new national securities exchange adds a competitor to the equity exchange landscape, and while this filing is purely administrative, IEX will need to compete with TXSE for order flow once it begins trading in July 2026.