SEC Commissioner Raises Six Questions as Overnight Trading Expands
TREE NEWS reports: US equities are quietly drifting toward a 23-hour, five-day trading week. SEC Commissioner Hester M. Peirce has flagged the trend, noting that while overnight sessions still account for less than 1% of total NMS stock volume and remain concentrated in a handful of names, both incumbent exchanges and new venues have spent the past two years aggressively extending their hours. Her six questions cut to the heart of whether market structure, disclosure rules and investor protections can keep pace.
The Six Questions, Decoded
- Learning from other markets: How should US equities borrow from FX, crypto and futures markets that have run near-24/7 for years?
- Best execution: When overnight liquidity fragments and spreads widen, how do brokers meet best-execution duties and protect retail investors?
- Fiduciary duty: Is it still a defensible fiduciary decision for asset managers to simply opt out of overnight trading when execution costs are high?
- Disclosure timing: Does extended trading change how and when issuers release earnings and material news?
- EDGAR plumbing: Filings submitted after 5:30 p.m. ET are typically processed the next business day — does the system need reform for overnight sessions?
- Guidance and relief: Should the SEC offer guidance or exemptions for issuers, especially small caps?
Why It Matters
The most underappreciated issue is the EDGAR gap. If a company drops material news at 2 a.m. ET and the filing is not processed until the next day, overnight traders are effectively trading on rumor and headline risk while the official record lags. That is a structural information asymmetry — precisely the kind of thing that erodes confidence in thinner sessions.
Liquidity is the second fault line. Overnight books are thin, spreads are wide, and market makers have less incentive to quote size. For retail investors using limit orders, that is manageable. For anyone using market orders, it is a tax. Peirce’s framing — that opting out may be a rational fiduciary choice — implicitly concedes that overnight markets are not yet mature enough to be mandatory for institutions.
Forward Look
The direction of travel is clear: trading hours will keep expanding because global investors demand it and venues compete on access. The regulatory question is not whether to allow 23/5, but how to make disclosure, surveillance and execution quality function around the clock. Expect pressure on the SEC to modernize EDGAR processing, clearer best-execution guidance for off-hours, and possibly tailored relief for small issuers. Crypto markets, which never close, offer a live experiment in what happens when disclosure and liquidity are permanently fragmented — a cautionary tale US equities would be wise to study.
