2026-18807NoticeWallet

Cboe BZX Fine-Tunes Trading Halts for Mergers and Splits

Published Date: 9/15/2026

Notice

Summary

Cboe BZX Exchange is updating its rules to make trading halts clearer when big company events happen, like mergers or stock splits. This change helps traders know exactly when trading stops and starts again, keeping things smooth and fair. The new rule kicks in right away and affects anyone trading on the BZX Exchange, with no extra costs involved.

Analyzed Economic Effects

3 provisions identified: 3 benefits, 0 costs, 0 mixed.

Mandatory Halts for Issuer Corporate Actions

If you hold or trade a security listed on Cboe BZX that is subject to certain issuer corporate actions, the Exchange will impose a mandatory regulatory halt after the end of the After Hours Trading Session and before 9:00 p.m. ET on the day immediately preceding the market effective date. This halt requirement applies when BZX is the security's Primary Listing Market and is intended to allow coordinated processing under the Exchange's proposed 23/5 Trading rules.

Which Corporate Actions Trigger Halts

The rule lists nine corporate-action types that will trigger mandatory halts when BZX is the Primary Listing Market: (1) trading symbol changes; (2) CUSIP changes; (3) stock dividends with aggregate value per share equal to at least 25% of the Official Closing Price; (4) forward and reverse stock splits; (5) De-SPAC transactions; (6) spin-offs; (7) security-type changes; (8) mergers/mandatory exchanges; and (9) other issuer events the Exchange determines require a halt.

Trading Resumes with 8:00 a.m. Halt Auction

Securities halted under this rule would resume trading with a Halt Auction at 8:00 a.m. ET on the market effective date, in advance of the 9:30 a.m. ET Opening Auction. The Exchange proposes this timing as part of its 23/5 Trading operations that are anticipated to commence on December 6, 2026.

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Key Dates

Published Date
Effective Date
9/15/2026
12/6/2026

Department and Agencies

Department
Independent Agency
Agency
Securities and Exchange Commission
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