In Brief
- Nasdaq filed a proposed rule change in December 2025 to extend US equities trading to 23 hours a day, 5 days a week
- The SEC approved the proposal on April 10, 2026, with Nasdaq targeting a launch in the second half of 2026
- Polymarket traders assign just a 12.5% probability that round-the-clock trading launches by June 30
Nasdaq wants to keep the lights on almost around the clock. The exchange filed a proposed rule change in December 2025 to extend US equities trading to 23 hours a day, five days a week. The SEC published the filing for comment in the Federal Register in January 2026, and approved the rule on April 10, 2026 — even as Congress pushes its own crypto market structure legislation forward.
That regulatory timeline is now showing up in prediction markets. On Polymarket, the contract on whether Nasdaq round-the-clock trading will launch by June 30 sits at just 12.5% probability as of this week. The market has attracted roughly $46,000 in volume and resolves to Yes only if Nasdaq extends its schedule to at least 22 hours per day by the deadline.
The 23-hour proposal divides trading into two sessions: a Day Session from 4:00 AM to 8:00 PM ET and a Night Session from 9:00 PM to 4:00 AM ET the following day, with a one-hour maintenance pause between 8:00 PM and 9:00 PM ET. Nasdaq argues that extended hours would better serve international investors and retail traders who cannot access markets during standard 9:30 AM to 4:00 PM sessions. Critics say longer hours concentrate risk in thin overnight liquidity, widen spreads, and increase the operational burden on broker-dealers already running near capacity.
The timeline is the real constraint. Although the SEC approved the rule on April 10, Nasdaq still needs to complete operational readiness testing, update systems, and coordinate with clearinghouses before launching — a process that historically takes months. Nasdaq CEO Adena Friedman said on the Q1 results call that the exchange targets a launch in the second half of 2026, with Markets Media reporting December 6, 2026 as the target date. Prediction market analysis site ProbSee shows the Yes probability at just 8–14%, reflecting the tight timeline. Prediction markets have been surprisingly accurate at forecasting outcomes this year — but for equities trading hours, the clock is still ticking much slower.
FAQ
What does Nasdaq’s proposal entail?
Extending US equities trading from the current 9:30 AM to 4:00 PM session to 23 hours a day — a Day Session from 4:00 AM to 8:00 PM ET and a Night Session from 9:00 PM to 4:00 AM ET — five days a week, with a one-hour maintenance pause between 8:00 PM and 9:00 PM ET.
Why is the Polymarket probability so low?
Although the SEC approved the rule on April 10, 2026, Nasdaq still needs months for operational readiness testing and coordination with clearinghouses before launch, making a June 30 start unlikely.
How much trading volume does the Polymarket contract have?
Roughly $46,000 as of this week. The market resolves to Yes only if Nasdaq extends to at least 22 hours per day by June 30, 2026.