SEC brings exchanges, brokers and market makers together on 24-hour stock trading
A Sept. 17 roundtable will examine whether U.S. market data, clearing, surveillance and investor protections are ready for near-continuous equity trading.
By The Third AnglePublished 4 min read
Major U.S. exchanges are preparing to keep equity markets open through most weekday hours. Photo: Unsplash · Unsplash License
The SEC has scheduled three industry panels
The U.S. Securities and Exchange Commission has assembled exchanges, brokers, market makers, asset managers and market-infrastructure providers for a Sept. 17 roundtable on near-continuous stock trading. The official agenda lists 27 panelists across three sessions—not 17—and includes representatives from BlackRock, Citi, Nasdaq, NYSE, Robinhood, Citadel Securities, UBS, Charles Schwab, 24X, Cboe, FINRA and DTCC.
The event will run from 10 a.m. to 4 p.m. Eastern at SEC headquarters in Washington and will be streamed online. Its first panel will focus on exchange and broker readiness, overnight surveillance, closing-price processes, clearance and settlement, investor protections and the liquidity firms expect outside traditional market hours.
A second panel will examine operational resilience: system capacity, cybersecurity, failover plans, market-data continuity, shorter maintenance windows and overnight staffing. The final session will consider the effects on liquidity and capital formation and the infrastructure that would be needed for any later move from weekday 23-hour trading toward 24/7 markets.
The shift is already moving through approvals
The discussion is not starting from zero. Nasdaq's approved model adds a 9 p.m.-to-4 a.m. Eastern session to its existing premarket, regular and post-market periods. The combined schedule creates 23 hours of weekday trading, separated by a one-hour nightly pause for processing and the transition to the next trade date. Launch timing depends on consolidated market-data readiness and related rule changes.
NYSE Arca also received SEC approval to lengthen its extended sessions. NYSE initially described a 22-hour plan, but its current implementation materials now target a 23-hour schedule from 9 p.m. through 8 p.m. Eastern, five days a week, with the same one-hour processing break. NYSE says the launch depends on securities-information processors, clearing infrastructure and final operational alignment.
24X became the first national securities exchange approved for an overnight session in 2024. Its path has shown why exchange approval alone is insufficient: consolidated data feeds and clearing systems must be operating during the same hours before a lit national exchange can provide a complete market experience.
That balance matters because overnight access can come with thinner order books, wider spreads and prices that move more sharply when fewer buyers and sellers are present. Corporate actions, trading halts, best-execution duties and the official closing price also become harder to coordinate when trading stretches across calendar days and maintenance windows shrink.
For crypto readers, the roundtable is relevant because digital-asset venues normalized continuous trading and tokenized equities increasingly connect securities to blockchain settlement. But the SEC event concerns regulated U.S. equity-market infrastructure, not a decision to make stock exchanges operate like crypto exchanges. The next evidence will be concrete launch dates, overnight liquidity, investor disclosures and whether market-data and clearing systems perform reliably under the new schedule.
