SEC Commissioner Peirce Previews Compliance Issues as US Equities Move to 23-Hour Trading

Key Takeaways

• Commissioner Peirce opened an SEC roundtable on 24-hour trading by noting that US equity infrastructure is moving decisively toward a 23-hour, five-day trading week.
• The speech is not a rule, but its questions signal likely areas for future guidance or rulemaking: best execution, supervision, issuer disclosure, and EDGAR timing.
• Compliance teams should begin preparing now, ahead of the December 6, 2026 SIP launch.

Deep Dive

Commissioner Peirce opened an SEC roundtable on 24-hour trading by noting that US equity infrastructure is moving decisively toward a 23-hour, five-day trading week. The speech is not a rule, but its questions signal likely areas for future guidance or rulemaking: best execution, supervision, issuer disclosure, and EDGAR timing. Compliance teams should begin preparing now, ahead of the December 6, 2026 SIP launch.

The questions posed signal where supervisory attention may fall. On best execution, firms must show how they meet obligations when overnight liquidity is dispersed and spreads are wide. On investor protection, the focus is on retail participation, with open questions about whether the SEC or FINRA should provide assistance. On fiduciary duty, asset managers should document why they trade or decline to trade overnight, given a commenter's challenge on whether abstaining remains acceptable. Supervision and surveillance of trading and risk during low-staffing hours, along with manipulation and cybersecurity risks, were also flagged.

Issuer-related issues are significant. Issuers typically release material information before or after core hours to dampen price impact. With overnight trading, that practice may need to change. EDGAR filings submitted after 5:30 pm are generally not processed until the next business day, which raises timely-dissemination concerns, and the Commission may consider EDGAR modifications and guidance or relief, particularly for smaller issuers. Compression of batch processing and IT maintenance into a single nightly hour is a further operational resilience concern for broker-dealers and market infrastructure.

Recommended actions:

(1) map the business lines, order routing, and systems affected by the December 6, 2026 SIP change and by venue overnight sessions;

(2) update best execution policies, order handling disclosures, and retail risk disclosures for thin overnight markets;

(3) review supervisory procedures, surveillance coverage, escalation paths, and staffing models for overnight hours, including cyber monitoring and data-feed failure protocols;

(4) reassess back-office batch cycles, maintenance windows, and clearing and settlement readiness for the 24x5 NSCC model;

(5) for issuers and their advisers, review disclosure timing, Regulation FD procedures, and overnight monitoring; (6) track the roundtable record (File No. 4-913), FINRA communications, and CFTC activity on 24/7 futures trading, and consider submitting comments.

Overall risk is elevated for operational resilience, market conduct, and investor protection, with moderate regulatory uncertainty. Peirce's questions point to possible future guidance rather than imminent mandates, but firms entering overnight trading will be judged on the adequacy of controls in a less-staffed, more automated environment.

Source: Securities and Exchange Commission