Introduction: The Market No Longer Closes
For years, firms operated within a structure that felt stable enough not to question. Trading happened within defined hours, supervision aligned with that same window, and execution decisions could be evaluated against a shared understanding of market conditions. Even when markets were volatile, they remained within a timeframe that made those decisions easier to interpret.
That containment is starting to loosen, and the numbers make the shift undeniable.
Extended-hours trading now accounts for over 11% of all US equity trading volume, with more than 1.7 billion shares changing hands daily outside traditional market hours, more than double the rate recorded in 2019.
Advisors and clients increasingly act on information as it appears, whether that happens during the day, in the evening, or before markets officially open. What used to be considered edge activity now carries real weight, and in some cases, shapes outcomes before the primary session even begins.
The difficulty isn’t that trades are happening outside traditional hours. It’s that those trades are now being evaluated later under very different conditions. When someone reviews a decision the next day, they are often looking at a market that no longer reflects the one in which the decision was made.
This is where the pressure builds. Best execution still requires firms to seek favorable outcomes, but explaining those outcomes now demands a clearer connection between the decision and the environment in which it occurred. As market structure evolves, firms are being pushed toward a model in which execution, supervision, and documentation must hold together over a broader, less predictable timeline.
What’s Driving the Push Toward 24-Hour Markets
Retail Demand and Platform Competition
Investor expectations are shifting in ways that are difficult for firms to ignore. Retail participants are increasingly accustomed to immediate access, and when market-moving information appears outside traditional hours, waiting for the next session feels like a limitation rather than a norm.
Retail investors now account for 20–35% of daily trading volume across the US, UK, and South Korean markets. Among Gen Z investors, 49% trade weekly and 25% trade daily, a generation that expects markets to meet them on their schedule.
Platforms have responded by expanding access, creating a competitive cycle. As more firms extend trading windows, others follow to avoid falling behind. Over time, what started as a differentiator begins to feel like a baseline expectation. This dynamic doesn’t just increase trading activity outside core hours; it also shifts the timing of when firms need to be prepared to support it.
Global Liquidity and Cross-Market Activity
Markets are also more interconnected than they were in the past. Activity in one region now influences another more quickly, and developments across Asia, Europe, and the United States increasingly overlap, shaping pricing before domestic markets fully open.
Pre-market trading (4:00–9:30 am ET) now accounts for over 55% of all extended-hours volume – up from just 37% five years ago. Pre-market activity has grown 15-fold since 2019, while post-market activity has increased 2.3 times over the same period. Global news cycles and cross-market correlations are pulling trading activity earlier into the day, creating new compliance pressure points that many firms’ systems were not designed to handle.
Regulatory and Industry Momentum
The shift toward extended trading is not happening in isolation. In November 2024, the SEC approved overnight trading for the 24X National Exchange. Nasdaq has announced plans to launch 24-hour, five-day-a-week trading on its flagship exchange in 2026. Industry discussions are increasingly focused on how market structure should evolve, particularly in areas such as liquidity, execution quality, and investor protection.
Regulators are paying attention for the same reason. The rules themselves have not changed, but the environment to which those rules apply is becoming more complex. As firms experiment with longer trading windows, expectations around how execution decisions are made and explained continue to rise.
Why 24-Hour Trading Breaks Traditional Best Execution Assumptions
Liquidity Is Not Constant
Liquidity behaves differently depending on when a trade occurs. During peak market hours, firms can rely on deeper order books and tighter spreads, which provide a stable reference point for evaluating execution decisions. Outside those hours, that stability is less consistent. Liquidity can thin out quickly, spreads can widen, and pricing may become more volatile. A trade executed under those conditions may be entirely reasonable in context, yet appear less favorable when compared to activity during a more liquid session. This mismatch makes it harder to evaluate execution consistently.
Execution Quality Becomes Harder to Measure
Best execution requires firms to evaluate multiple factors, including price, speed, and likelihood of execution. In an environment where conditions vary across sessions, those factors don’t carry the same weight at all times. A decision that prioritizes immediacy in a thinner market may differ from one that prioritizes price improvement during peak hours. The complexity arises when those decisions are reviewed later — especially if the comparison relies on conditions that were not present at the time of execution.
Routing Decisions Become More Complex
Routing decisions also become more nuanced in an extended trading environment. Firms must account for differences in liquidity, venue availability, and execution probability across time. Without clear documentation, even well-reasoned decisions can be difficult to explain later. The issue is not whether firms are making appropriate choices; it’s whether they can demonstrate the reasoning behind those choices when conditions vary.
The Compliance Implications for Advisors and Broker-Dealers
Best Execution Still Applies — But Context Matters More
The obligation to achieve best execution under FINRA Rule 5310 and SEC Regulation Best Interest has not changed, but demonstrating that obligation now requires more context. Firms need to show how decisions were made based on the conditions that existed at the time, rather than relying on assumptions drawn from more stable market environments. This places greater emphasis on capturing the full context of each decision at the moment it is made.
Supervision Must Extend Beyond Market Hours
As trading activity expands, supervision must extend with it. Firms can no longer rely on oversight models that align only with traditional business hours, because relevant activity may occur outside those windows. This requires systems that provide consistent visibility into advisor and trading activity regardless of timing. Without that visibility, supervision becomes uneven and harder to defend during examinations.
Recordkeeping Is Now a Compliance Frontline
Regulators have made clear that recordkeeping is not a back-office concern — it is a frontline compliance obligation. The enforcement record speaks for itself.
Since December 2021, the SEC’s recordkeeping enforcement initiative has resulted in charges against more than 100 firms and over $2 billion in penalties. In FY2024 alone, more than $600 million in civil penalties were issued against 70+ broker-dealers and investment advisers for electronic communication failures.
In January 2025, the SEC charged 12 firms, including 9 investment advisers and 3 broker-dealers, with a combined $63.1 million for failures to maintain and preserve electronic communications.
Firms must be able to show not only what happened, but how and why it happened. This requires connecting execution decisions, supervision, and communication into a coherent sequence that reflects actual events. When records are fragmented, firms are forced to reconstruct the sequence after the fact, introducing uncertainty and significant regulatory risk.
Where Firms Are Most Exposed Today
Most firms’ compliance frameworks were designed around traditional trading hours. As market structure evolves, three gaps have emerged that create meaningful regulatory exposure.
1. Policies Designed for Traditional Hours
Many firms still rely on Written Supervisory Procedures (WSPs) built around standard trading sessions. These often do not fully account for how execution should be handled as conditions vary over extended hours, creating a gap between policy and practice that regulators have begun to identify during examinations.
The 2025 FINRA Annual Regulatory Oversight Report specifically highlights gaps in the supervision framework and incomplete WSPs as recurring examination findings.
2. Limited Visibility Into Off-Hours Activity
Supervision frameworks may not always extend to off-hours activity, creating areas where visibility is reduced, and potential issues can develop undetected. In an extended-hours environment, these blind spots carry greater consequence — both for clients and for the firm’s regulatory standing.
3. Incomplete Documentation of Execution Decisions
Even when firms make reasonable decisions, they may not consistently document the reasoning behind those decisions. Without that documentation, explaining those decisions later — to a supervisor, a regulator, or during an examination — becomes significantly more challenging and may invite scrutiny that a well-documented decision would have avoided.
The Shift to Continuous Execution Oversight
What Continuous Oversight Looks Like
Firms are beginning to move toward a model where execution oversight is integrated into daily operations rather than applied after the fact. Monitoring occurs as activity happens, decisions are documented in context, and supervision aligns with execution rather than following it.
This approach reduces the need for reconstruction and provides a clearer view of how decisions were made.
What an Exam-Ready Execution Model Looks Like
Firms that adapt successfully tend to reduce the distance between action and evidence. Execution decisions are captured in real time, supervision provides consistent visibility across sessions, and records reflect the sequence of events as they occur.
Conclusion: Best Execution Without Boundaries
Market structure is evolving in ways that challenge long-standing assumptions about trading and compliance. The obligation to achieve best execution remains unchanged, but the environment in which that obligation must be met is becoming more complex, and the regulatory stakes have never been higher.
Firms that adapt successfully will move toward systems that support continuous oversight, consistent decision-making, and clear documentation. With pre-market volume growing 15-fold in five years and the SEC actively pursuing recordkeeping failures across the industry, the question is no longer whether firms need to evolve their compliance frameworks — it’s how quickly they can.
Self-Assessment: Is Your Firm Ready for Extended-Hours Compliance?
Use this checklist to evaluate your firm’s current exposure. Gaps identified here are worth addressing before your next examination — not after.
- Can you measure execution quality for trades that occur outside traditional market hours?
- Do your Written Supervisory Procedures (WSPs) specifically address extended-hours trading conditions?
- Can you explain routing decisions made in pre-market or after-hours sessions with sufficient documented context?
- Do supervisors have real-time visibility into advisor activity outside of standard business hours?
- Are electronic communications tied to off-hours execution decisions captured, preserved, and retrievable?
- Can you reconstruct a complete execution timeline — from communication to trade to supervision review — for any given session?
- Has your firm reviewed its recordkeeping practices in light of recent SEC enforcement actions on off-channel communications?
Frequently Asked Questions
Does the best execution obligation apply to trades made outside regular market hours?
Yes. The obligation to seek best execution under FINRA Rule 5310 and SEC Regulation Best Interest applies regardless of when a trade occurs. What changes in extended-hours markets are the context: liquidity conditions, spread widths, and venue availability all differ from standard sessions. Firms must document decisions in a way that reflects those conditions at the time of execution — not conditions from a more liquid session hours later.
What does ‘extended-hours trading’ mean from a compliance perspective?
Extended-hours trading refers to activity that occurs outside the standard NYSE/Nasdaq session (typically 9:30 am–4:00 pm ET). This includes pre-market sessions (4:00–9:30 am ET) and after-hours sessions (4:00–8:00 pm ET). From a compliance standpoint, these sessions are subject to the same supervision, recordkeeping, and execution quality standards as regular-hours trading — with additional documentation requirements to account for materially different market conditions.
What are regulators looking for in extended-hours execution reviews?
Regulators, including FINRA and the SEC, are looking for evidence that firms: (1) have written policies that specifically address extended-hours trading conditions; (2) can demonstrate that execution decisions were made in the client’s best interest given conditions at the time; and (3) maintain complete records connecting communications, execution decisions, and supervision reviews.
The 2025 FINRA Annual Regulatory Oversight Report identifies completeness of the best-execution and supervision framework as an ongoing area of examination focus.
How does off-channel communication create compliance risk in 24-hour markets?
Off-channel communications — text messages, WhatsApp, personal email, and similar tools — become especially risky in extended-hours environments because advisors and clients often communicate outside of monitored firm systems during non-business hours. If those communications relate to execution decisions and are not captured, firms face both a recordkeeping violation and an inability to reconstruct the context of those decisions.
The SEC has pursued more than $2 billion in penalties related to off-channel communication failures since December 2021.
Do Written Supervisory Procedures (WSPs) need to be updated for extended-hours trading?
Most likely, yes. WSPs written for traditional trading windows often do not specifically address supervision protocols, execution standards, or communication capture requirements for pre-market and after-hours activity. FINRA has identified WSP gaps as a common deficiency in examinations. Firms should review their WSPs against current market structure realities and document that review — both as a compliance best practice and as evidence of a proactive compliance culture.
