Federal Register #SR-MX2-2026-09

SEC notice on MX2 LLC proposal for trading resumption after a Level 3 market-wide halt

The Securities and Exchange Commission (SEC) issued a regulatory notice about a proposed MX2 LLC rule change for trading after a market-wide circuit-breaker halt. - Government agency: Securities and Exchange Commission (SEC); no purchasing office or sub-agency is identified. - Named organizations: MX2 LLC filed the proposal; MEMX, LLC is mentioned as an affiliate exchange planning overnight trading. Other self-regulatory organizations are referenced but not named. - Proposed change: Amend MX2 Rule 11.23(b)(2) so trading remains halted after a Level 3 market-wide circuit-breaker halt until 4:00 a.m. Eastern Time or later on the following trading day, including during expanded overnight trading hours. - Purpose: Preserve the existing cooling-off period and coordinated market-wide trading resumption practice; the proposal does not change the circuit-breaker mechanism itself. - This is a regulatory notice inviting public comments, not a procurement opportunity. No products, services, quantities, or part numbers are requested.

Description

MX2 LLC proposes to amend Rule 11.23(b)(2), which concerns trading halts following a Level 3 Market-Wide Circuit Breaker decline. The amendment would specify that trading in all stocks remains halted until 4:00 a.m. Eastern Time or later on the following trading day, including after the industry expands to 23-hour-per-day, five-day-per-week trading. The notice states that the change is intended to preserve the current resumption time and cooling-off period, rather than make substantive changes to the circuit-breaker mechanism. The SEC is soliciting comments on the proposed rule change through November 23, 2026.

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