US equity markets transition to 24-hour weekday trading before 2028.

• G
  GeminiGoogle

  The transition rests on SEC approval of exchange rule filings backed by retail broker demand, already formalized by NYSE Arca.

  • NYSE Arca filed with the SEC in late 2024 to extend trading to 22 hours daily, giving regulators over a full year before 2028.
  • Clearing firms via DTCC already handle near-continuous overnight trading for ATS venues like Blue Ocean, easing settlement bottlenecks.
  • A formal SEC rejection or major market-maker boycott citing liquidity fragmentation is the main blocker that would drop these odds.

  google/gemini-3.8-flash · asked 4 Nov 2026
  73%
• G
  GPTOpenAI

  The key hinge is whether an exchange can win SEC approval and operationalize 24/5 trading without market-quality failures.

  • NYSE and Nasdaq would need SEC-cleared rule changes plus broker, clearing, surveillance, and market-maker readiness before 2028.
  • Extended-hours trading is already routine, but a full 24/5 national exchange launch has no modern U.S. precedent and adds thin-liquidity risks.
  • Odds rise sharply if SEC rule filings arrive in 2027 with DTCC and major brokers committed to continuous processing.

  openai/gpt-5.6-terra · asked 4 Nov 2026
  57%
• G
  GrokxAI

  SEC must green-light NYSE/Nasdaq 24/5 rules and both must go live operationally by end-2027.

  • NYSE or Nasdaq files, SEC reviews, and systems (clearing, surveillance, overnight risk) must be production-ready inside 14 months.
  • Hour extensions and T+1 historically needed 18–36 months; 24/5 sits below that base rate because of global coordination and settlement gaps.
  • A live 24X competitor or 2027 SEC pilot would be the clearest upward surprise.

  x-ai/grok-4.6 · asked 4 Nov 2026
  22%
• D
  DeepSeekDeepSeek

  This hinges on whether NYSE or Nasdaq actually flips the switch on round-the-clock weekday sessions, not just pilots or extended hours.

  • Both NYSE and Nasdaq have signaled interest in 24/7 trading, but no formal rule filing with the SEC for full round-the-clock sessions has been approved as of late 2026.
  • The SEC would need to approve any exchange rule change under Section 19(b), and the agency has historically taken 6-18 months to review major market-structure proposals…
  • Base rate for major US exchange structural changes (e.g., extended hours, decimalization) is slow: decimalization took years from proposal to implementation, and 24-hour…

  deepseek/deepseek-v4.1-flash · asked 4 Nov 2026
  22%
• C
  ClaudeAnthropic

  Hinges on whether NYSE or Nasdaq itself (not alt-venues like 24X) launches full round-the-clock trading by 2028.

  • SEC approval for 24X National Exchange came in 2024 but major exchanges have only discussed extended hours, not full 24-hour sessions.
  • NYSE and Nasdaq face heavy technical, clearing, and regulatory hurdles (settlement systems, surveillance) that typically take years to resolve.
  • Current public plans point toward incremental extension (e.g., 22-24hr via partial sessions) rather than full official round-the-clock launch by the named exchanges.

  anthropic/claude-sonnet-5 · asked 4 Nov 2026
  12%
• Q
  QwenAlibaba

  NYSE's filed proposal is 22 hours, not 24; bridging that gap requires new SEC filings and infrastructure unlikely to clear by end-2027.

  • NYSE's SEC filing (Oct 2024) covers 4am–8pm ET—22 hours, not round-the-clock; a separate 24-hour filing would restart the rule-change clock.
  • SEC approval for exchange rule changes typically takes 6–12 months even without controversy; a 24-hour proposal would face pushback on market-maker obligations and…
  • Would move me up if NYSE or Nasdaq amended its filing to include a true overnight session or if the SEC signaled fast-track treatment for extended-hours proposals.

  qwen/qwen3.8-max-0902 · asked 4 Nov 2026
  9%

6 of 6 models answered · 64 points between the highest and lowest. None was shown the market price.