Federal Register #SR-MEMX-2026-28

MEMX LLC Rule Change for 23-Hour, Five-Day Trading of Equities and ETPs

This notice concerns a regulatory proposal by MEMX LLC, an equity exchange, to extend its trading hours. - Government Buyer: - Securities and Exchange Commission (SEC) - OEMs and Vendors: - MEMX LLC (exchange operator) - Other referenced exchanges: Cboe EDGX Exchange, Inc., NYSE Arca, 24X National Exchange, LLC, Nasdaq - Products/Services Requested: - No procurement of products or services; this is a rule change affecting trading operations - Introduction of a new Overnight Trading Session for equity securities and UTP Exchange Traded Products - Updates to trading rules, order types, execution, and risk controls to support 23-hour trading, five days per week - Unique or Notable Requirements: - Overnight Trading Session will not commence until equity data plan readiness is confirmed - Rule change modeled after similar proposals by other exchanges - Focus on increasing market accessibility and investor protection - MEMX LLC will file a subsequent rule change to confirm regulatory compliance before launch

Description

The Securities and Exchange Commission announces the filing and immediate effectiveness of a proposed rule change by MEMX LLC to amend its rules to permit trading of equity securities and UTP Exchange Traded Products 23 hours per day, five days per week. The proposal includes the introduction of a new Overnight Trading Session and conforming amendments to existing trading rules. The change aims to increase market accessibility and accommodate investor interest in overnight trading hours. The Exchange will file a subsequent rule change before commencing the Overnight Trading Session to confirm compliance with regulatory obligations.

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