Federal Register #SR-CboeBYX-2026-034

Cboe BYX proposal to clarify trading resumption after a Level 3 market-wide circuit breaker

The Securities and Exchange Commission notice concerns a proposed Cboe BYX Exchange, Inc. rule clarification, not a procurement opportunity. - Government entity: U.S. Securities and Exchange Commission (SEC). - Company named: Cboe BYX Exchange, Inc., the exchange proposing the rule change. - Proposal: Amend BYX Rule 11.29(b)(2) to clarify that all stocks remain halted after a Level 3 market-wide circuit breaker until 4:00 a.m. ET or later on the following trading day. - Purpose: Preserve the existing cooling-off period and coordinated market-wide resumption practice as some exchanges expand trading hours. - Procurement items: No products, services, quantities, part numbers, or OEMs are identified. The notice invites public comments.

Description

Cboe BYX Exchange, Inc. proposes to amend Rule 11.29(b)(2), which governs resumption of trading after a Level 3 market-wide circuit breaker halt. The amendment would specify that trading in all stocks remains halted until 4:00 a.m. ET or later on the following trading day, in connection with the industry's planned expansion to 23-hour-per-day, five-day-per-week trading. The notice states that the change is intended to preserve the existing resumption timing and cooling-off period, rather than make substantive changes to the market-wide circuit breaker mechanism. The Securities and Exchange Commission published the notice to solicit comments on the proposed rule change.

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