The U.S. Securities and Exchange Commission (SEC) has announced a public roundtable for September 17, 2026, to examine preparations for a potential move toward 24-hour trading in the U.S. equity markets.
The discussion will focus on overnight trading, market operations and resiliency, as well as the opportunities and challenges associated with extending trading hours. SEC Chairman Paul S. Atkins has also highlighted the prospect of bringing U.S. equity markets closer to markets that already support more continuous trading, while maintaining appropriate investor and customer protections.
Importantly, the announcement does not establish 24-hour trading or propose a new trading-hours rule. The roundtable represents an early-stage regulatory discussion about what a more continuously operating U.S. equity market could require.
Why the SEC Is Examining 24-Hour Trading
The significance of the roundtable extends beyond whether U.S. exchanges should simply remain open for more hours.
Moving toward 24-hour trading would require regulators and market participants to consider whether the broader market infrastructure can support substantially longer periods of continuous activity. Trading venues, broker-dealers and other market participants would need to consider operational resiliency, liquidity conditions, surveillance and investor protection outside traditional U.S. trading hours.
The roundtable provides the SEC and market participants with an opportunity to examine these issues before any potential future regulatory developments. Public comments may also help identify operational challenges and areas where existing market practices may need to adapt.
Extended Trading Hours Could Affect Liquidity Differently Across Securities
One of the key considerations is whether longer trading hours would affect securities differently across the market.
Large-cap securities with deep institutional participation and significant international investor interest may be better positioned to maintain liquidity outside regular U.S. trading hours. Smaller or less actively traded securities may face a different environment.
If trading activity is spread across a much longer period without a corresponding increase in investor participation, liquidity could become thinner during certain hours. Wider bid-ask spreads and greater price sensitivity to relatively small orders could become more significant concerns, particularly for less liquid securities.
The practical issue is therefore not simply whether investors can trade around the clock, but whether meaningful liquidity and reliable price discovery can be maintained throughout those additional hours.
A Longer Trading Day Could Change How Public Companies Approach Disclosure
For listed companies, 24-hour trading could also challenge the traditional distinction between regular market hours and after-hours disclosure.
Companies have traditionally used periods outside regular market hours for earnings releases, material announcements and other corporate communications. A market operating much closer to continuously could narrow this traditional distinction between regular trading hours and after-hours disclosure.
That does not automatically mean existing SEC disclosure requirements would change. However, issuers may eventually need to reconsider the operational side of disclosure: when material information should be released, how investor communications are coordinated across time zones, and whether internal disclosure procedures remain appropriate when the company’s securities can trade during substantially more of the day.
For foreign private issuers and other internationally based U.S.-listed companies, this issue could be particularly relevant because management, advisers and investors may already operate across several jurisdictions and time zones.
24-Hour Trading Would Require Broader Market Infrastructure Readiness
Extending trading hours involves more than keeping an exchange’s matching engine running overnight.
A functioning equity market depends on a broader network of broker-dealers, market makers, clearing and settlement arrangements, market-data systems, surveillance functions and operational support. If trading hours expand significantly, these systems must be capable of processing and supporting transactions reliably for longer periods while still allowing necessary maintenance, risk management and recovery procedures.
This is why the SEC specifically identified operations and resiliency as part of the September discussion. The question is not simply whether additional trading can occur, but whether the infrastructure supporting those trades can operate safely and consistently under an expanded schedule.
24-Hour Trading Is Also a Question of Global Market Access
The discussion also reflects the increasingly international nature of U.S. capital markets.
Investors in Asia and other regions currently participate in U.S. markets across significant time zone differences. More continuous trading could make U.S.-listed securities more accessible to international investors during their own trading day and potentially allow U.S. markets to respond more quickly to developments occurring outside North American trading hours.
Chairman Atkins specifically referred to the prospect of U.S. equity markets aligning more closely with markets that already trade continuously. For internationally oriented issuers, extended trading could therefore become relevant not only as a market-structure development, but also in how U.S.-listed securities are accessed by investors across different time zones.
What U.S.-Listed Companies Should Watch Next
The September 17 roundtable should be viewed as the beginning of a regulatory discussion rather than the introduction of a new trading regime.
The next important signals will include the SEC’s agenda and panel composition, the issues raised by market participants, public comments submitted under File No. 4-913, and any subsequent regulatory or market-structure developments.
For public companies, there is no immediate requirement to change disclosure practices or compliance procedures based on the announcement alone. However, companies should monitor how the discussion develops, particularly if future developments begin to address trading infrastructure, disclosure timing or the operation of listed securities outside traditional market hours.
As U.S. market structure continues to evolve, Hexcellence Consulting helps companies understand how regulatory developments may affect their U.S. listing, ongoing compliance and capital markets strategy. Contact us to discuss how emerging U.S. market developments may affect your company.
