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NYSE Arca is updating its rulebook to enable '23/5 Trading' — a near-continuous trading schedule running from 9:00 p.m. Sunday through 8:00 p.m. Friday, with a one-hour technical pause each weekday evening. This refines an earlier SEC-approved extended hours framework and aligns NYSE Arca with a broader industry-wide plan to launch overnight equity trading on December 6, 2026, with Nasdaq and Cboe EDGX also filing similar proposals. Because this was filed as immediately effective, it is already technically in force, though the actual overnight session won't launch until the market data infrastructure (SIPs/Equity Data Plans) is ready and a final activation filing is submitted — meaning no immediate change for traders, but the competitive framework is now in place. When it does go live, retail and institutional investors will be able to trade NMS stocks on NYSE Arca around the clock on weeknights, representing a fundamental expansion of U.S. equity market hours.
IEX RELEVANT The industry-wide move to 23/5 overnight trading, with NYSE Arca, Nasdaq, and Cboe all aligning on a December 6, 2026 launch, creates significant competitive pressure on IEX to decide whether and how to participate in overnight sessions, and raises questions about whether IEX's speed bump and investor-protection-focused model can or should extend to a lower-liquidity overnight environment where adverse selection risks are heightened.