Federal Register #SR-MEMX-2026-29

SEC Notice: MEMX LLC Rule Change on Trading Resumption After Level 3 Circuit Breaker Halt

This notice concerns a proposed rule change by MEMX LLC, published by the Securities and Exchange Commission (SEC). - Government Buyer: - Securities and Exchange Commission (SEC) - OEMs and Vendors: - MEMX LLC (self-regulatory organization and equity exchange) - Products/Services Requested: - No products, part numbers, or purchase quantities are requested - No services are being procured - Unique or Notable Requirements: - The rule change amends MEMX Rule 11.23(b)(2) to clarify that, after a Level 3 market-wide circuit breaker halt, trading will resume at 4 a.m. on the following trading day - This applies even after MEMX extends its trading hours to 23 hours per day, 5 days per week - The amendment is designed to maintain consistency with current market practice and ensure market stability during significant declines - The notice highlights the importance of harmonized rules across U.S. equity exchanges and FINRA - Similar rule changes will be filed by other self-regulatory organizations - No procurement of goods or services is involved in this notice

Description

The Securities and Exchange Commission has published a notice regarding the filing and immediate effectiveness of a proposed rule change by MEMX LLC. The rule change amends Rule 11.23(b)(2) concerning the resumption of trading following a Level 3 market-wide circuit breaker halt. The amendment is to maintain the resumption time at 4 a.m. following a Level 3 halt despite the extension of trading hours to 23 hours per day, 5 days per week. This change ensures consistency and stability in market operations during significant market declines.

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