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Nasdaq is proposing to extend its U.S. equity trading hours from the current 16 hours/day (4am–8pm ET) to 23 hours/day, 5 days/week, by adding a new 'Night Session' from 9pm–4am ET, starting Sunday nights. This is a notice of filing, meaning the SEC is publishing it to solicit public comments — it is an early procedural step, not approval; the SEC has up to 90 days to approve, disapprove, or open formal proceedings. Given that the SEC has already approved similar proposals from NYSE Arca and 24X National Exchange, Nasdaq's proposal has a reasonable likelihood of approval, though actual launch is contingent on the consolidated tape (SIP) infrastructure being ready to operate overnight. If approved and launched, market participants wishing to trade Nasdaq-listed equities and ETFs overnight would need to obtain new dedicated 'Night Session' ports and would face reduced order type availability (no pegged orders, no midpoint orders, no open/close auction types) — similar to current post-market conditions.
IEX RELEVANT This is highly relevant to IEX competitively. If Nasdaq successfully launches 23/5 trading, it sets a new baseline expectation for U.S. equity exchanges, potentially pressuring IEX to consider extending its own hours or risk being seen as a less complete venue. More immediately, Nasdaq's overnight session would operate without Reg NMS protections, without pegged order types, and without NBBO-linked pricing — an environment where IEX's core differentiators (D-Limit, crumbling quote protection, speed bump) would not apply or would be less relevant, since overnight liquidity dynamics differ fundamentally from regular hours. IEX's investor-protection brand could either benefit (by not rushing into a lower-protection overnight environment) or be challenged (if institutional clients demand overnight access). Additionally, if overnight trading grows and Nasdaq captures significant overnight volume, it could strengthen Nasdaq's overall market share narrative and attract new members/order flow that IEX would not capture. IEX leadership will need to formulate a public and strategic response to whether and how it enters the overnight trading space.