The takeaway in 30 seconds: On July 23, 2026, the SEC announced a September 17 roundtable to discuss moving U.S. equity markets toward 24-hour trading overnight sessions, round-the-clock operations, and the resiliency questions that come with them. This is early: a roundtable, not a rule, and no obligation attached to RIAs today. But the direction is worth tracking, because if markets move to continuous trading, several things RIAs already do seeking best execution, monitoring employee trades, supervising activity would have to work in a world without a market close. This isn’t a call to act. It’s a call to start thinking about assumptions built into your operations that a 24-hour market would quietly break.
The U.S. equity market has always had a rhythm: it opens, it trades, it closes. That daily close isn’t just a convention it’s a structural assumption baked into how a great many compliance and operational processes work, often invisibly. A lot of things get done “after the close” or “before the open” precisely because there is a close and an open.
The SEC’s July 23 announcement signals that this rhythm may be up for reconsideration. The Commission will host a roundtable on September 17 to discuss moving toward 24-hour trading examining the preparations needed to support overnight sessions, the operational resiliency a continuous market would demand, and the opportunities and challenges of getting there. In the Chairman’s framing, U.S. markets would be aligning with markets elsewhere that already trade continuously, while balancing round-the-clock activity with investor protection.
It’s worth being clear about where this is: it’s a discussion, not a decision. There’s no rule, no proposal, and nothing an RIA needs to do about it right now. But it points at a change significant enough that thinking ahead costs nothing and being caught flat-footed later could cost a fair amount. The useful exercise isn’t preparation it’s noticing which of your current assumptions quietly depend on the market closing every day.
Why This Matters to RIAs at All
24-hour trading is, first and foremost, a market-structure and infrastructure question. It lands most heavily on exchanges, broker-dealers, custodians, and the clearing and settlement systems that would have to operate continuously. RIAs aren’t the primary subject of the conversation.
But RIAs sit downstream of market structure, and several duties they carry directly are shaped by the assumption of a daily trading cycle. When the structure changes, the duties don’t change but the operational reality of satisfying them does. That’s the connection worth understanding: not that 24-hour trading creates new RIA obligations, but that it would change the environment in which existing obligations have to be met.
Three areas are where that shows up most clearly.
Best Execution in a Market That Never Closes
RIAs have a fiduciary duty to seek best execution for client trades evaluating price, speed, likelihood of execution, and overall cost across the venues they use. That analysis currently operates within a defined trading day. There’s a regular session, there are established measures of liquidity and spread during that session, and best-execution reviews are built around those known conditions.
A 24-hour market complicates that picture in ways worth anticipating. Overnight sessions would likely have thinner liquidity and wider spreads than regular hours, at least initially. A trade executed at 3 a.m. might receive meaningfully different execution quality than the same trade at 11 a.m. which raises questions an RIA’s best-execution process would eventually need to answer: How do you evaluate execution quality across a continuous market with varying liquidity by hour? Is executing in a thin overnight session consistent with best execution, or does the duty imply waiting for deeper daytime liquidity? How does the firm’s review process account for a trading day that no longer has a clear beginning or end?
None of these need answers today. But a best-execution framework built entirely around regular-session assumptions is a framework that would need rethinking if continuous trading arrives.
Trade Surveillance When There’s No “Close” to Anchor To
Personal trade monitoring and the broader surveillance of trading activity lean heavily on the daily cycle. Many surveillance processes are structured around end-of-day data comparing the day’s trades against restricted lists and client activity, reviewing what happened after the market closed. The close provides a natural checkpoint: a moment when the day’s activity is complete and can be reviewed as a unit.
Remove the close, and that checkpoint dissolves. In a continuous market, when does “the day’s trading” end for review purposes? If an access person can trade at any hour, does surveillance need to move from periodic end-of-day review toward something closer to continuous monitoring? The timing conflicts that personal-trade surveillance exists to catch an employee trading ahead of or alongside client activity don’t disappear in a 24-hour market. They get harder to catch with a review process built around a daily snapshot that no longer marks a natural boundary.
This is the area where the operational assumptions are most deeply buried. A firm might not even realize how much of its surveillance rhythm depends on the market close until the close is gone.
Supervision Across Hours Nobody Currently Works
The duty to supervise doesn’t come with business hours attached, but the practice of supervision has always assumed them. Firms supervise trading, communications, and advisory activity within a framework that quietly presumes this activity happens during a workday because, for equity trading, it largely has.
Continuous trading raises a straightforward but consequential question: who is supervising activity that happens at 2 a.m.? If clients or advisors can trade overnight, the supervision framework built around daytime activity has a gap during the hours the market is now open and the firm is, in every practical sense, asleep. This isn’t insurmountable, markets that already trade continuously have supervision models that function but it’s a genuine structural question that a firm accustomed to a nine-to-five equity market would need to work through.
Why “It’s Too Early to Care” Is the Wrong Instinct
The natural response to a roundtable announcement is to file it under “not yet relevant” and move on. For immediate action, that’s correct there’s nothing to do. But there’s a difference between “nothing to do” and “nothing to think about,” and conflating them is how firms end up reacting to change under pressure instead of ahead of it.
The value of an early signal like this isn’t that it demands preparation. It’s that it gives you time to notice, calmly and without deadline pressure, where your current operations carry assumptions that a structural change would break. That notice is much easier to do now as a thought exercise than later, when a rule is final, a compliance date is looming, and the same analysis has to happen in a hurry.
The firms that handle major market-structure shifts well are rarely the ones that move fastest once the rule lands. They’re the ones that saw the shift coming, understood which of their assumptions it threatened, and had already thought through the implications by the time action was required. This roundtable is an invitation to start that thinking, cheaply, well before it’s forced.
What to Do With This
Nothing in your compliance program needs to change because of a roundtable announcement. But two things are worth doing while this is still a low-stakes thought exercise.
- Notice where your operations assume a market close. Walk through your best-execution review, your trade surveillance, and your supervision processes, and ask a single question of each: does this quietly depend on the market opening and closing every day? Wherever the answer is yes, you’ve found an assumption a 24-hour market would eventually challenge. You don’t need to fix anything just knowing where those assumptions live is the valuable part.
- Track the conversation, and consider weighing in. The roundtable is September 17, it will be streamed on SEC.gov, and the SEC is accepting public comment (File Number 4-913). An RIA with a practical perspective on how continuous trading would affect advisory operations has a genuine opportunity to put that view on the record while the framework is still being shaped.
24-hour trading may or may not arrive, and if it does, it won’t be soon. But the assumptions it would challenge are already sitting in your operations, built in so deeply that most firms have never had a reason to notice them. A roundtable announcement is a low-cost prompt to notice them now long before noticing becomes urgent.
