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.
Personalized for You
How does this regulation affect your finances?
Personalize government policy and PRIA will tell you what this federal register document means for your household, plus every other regulation we track. PRIA reads each provision against your financial profile to show you exactly what matters to your wallet.
Key Dates
Department and Agencies
Related Federal Register Documents
2026-20466, Adviser and Regulated Fund Custody Rules; Crypto Custody Rules
The SEC is updating rules for how investment advisers and funds handle crypto assets, making sure they keep these digital investments safe and properly reported. These changes affect advisers, funds, and anyone managing crypto securities, aiming to modernize rules and improve transparency. Comments on the proposal are open until December 7, 2026, so get ready to weigh in!
2026-19260, Rescission of Rule 14a-8's Federal Regulation of Shareholder Proposals and Amendments to Rule 14a-4
The SEC wants to stop its federal rule that controls how shareholders can make proposals at company meetings, letting state laws and company rules take over instead. They’re also changing rules so companies can sometimes vote on proposals not in their official materials—but shareholders can opt out if they want. This affects investors and companies, with comments open until November 20, 2026, and could shake up how shareholder voices are heard and counted.
2026-18424, Political Contributions by Certain Investment Advisers
The Securities and Exchange Commission (the "Commission" or the "SEC") is proposing to rescind the political contribution rule under the Investment Advisers Act of 1940 (the "Advisers Act"), which prohibits investment advisers from providing investment advisory services for compensation to a government client for two years after an adviser or any covered associate of the adviser makes a contribution to certain categories of elected officials or candidates, among other prohibitions. In the more than fifteen years since the rule was adopted, implementation challenges associated with the political contribution rule have resulted in a range of significant unintended consequences, including compliance practices among some investment advisers that may have had the effect of restricting all political contributions by the investment advisers and their employees. Market participants also have stated that the political contribution rule is burdensome, complex, and both lacks clarity and creates a de facto strict liability standard. The Commission is of the view that other existing requirements of the Advisers Act and its associated rules, including prohibitions on fraud, fiduciary duty requirements, the compliance rule, and the code of ethics rule (defined below), are likely sufficient to address pay-to-play practices while allowing an adviser the flexibility to implement an approach that is more appropriately tailored to its particular risks, rendering the political contribution rule unnecessary. The Commission also is proposing to amend the rule under the Advisers Act pertaining to books and records consistent with the proposed rescission.
2026-18190, Transfer Agent Rules
The U.S. Securities and Exchange Commission ("SEC" or "Commission") is proposing to adopt new rules, amend existing rules, amend the existing form for registration with the Commission as a transfer agent (Form TA-1) and the existing form for reporting activities of transfer agents (Form TA-2), and rescind an existing rule governing registered transfer agents. The proposals are designed to modernize the rules governing registered transfer agents.
2026-17183, Regulation Crypto Assets
The Securities and Exchange Commission ("Commission") is proposing new rules to create a tailored offering regime for certain investment contracts involving crypto assets. The proposed offering regime is intended to facilitate capital formation and accommodate innovation within the crypto asset markets while, at the same time, ensuring that investors are adequately protected and provided with the information they need to make informed investment decisions. The proposed rules would be set forth in a new regulation titled "Regulation Crypto Assets" and would include two exemptions from the registration requirements of section 5 of the Securities Act of 1933. The first exemption would permit offerings of up to $5 million during a four-year period. The second exemption would permit offerings of up to $75 million during each 12-month period. Under both exemptions, issuers would be required to make certain principles-based narrative disclosures available to their investors. In addition, issuers under the second exemption would be required to provide financial statements and would be subject to ongoing reporting requirements. Issuers that rely on these exemptions would remain subject to the antifraud and antimanipulation provisions of the Federal securities laws. The proposed rules also would include a conditional safe harbor from the term "investment contract" in the definitions of "security" in the Securities Act of 1933 and the Securities Exchange Act of 1934. If the conditions of that proposed safe harbor are satisfied, then a crypto asset would be deemed not to be subject to an investment contract for purposes of those definitions of "security."
2026-12163, The Trade-Through Rule and Locked and Crossed Markets Provisions of Regulation NMS
The SEC wants to scrap some old rules that stop stocks from being traded at worse prices and prevent confusing market quotes. This change affects stock traders and exchanges, aiming to simplify trading and possibly speed things up. If you want to share your thoughts, you’ve got until August 17, 2026, so don’t miss out!
Previous / Next Documents
Previous: 2026-18806, Self-Regulatory Organizations; Cboe BZX Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Exchange Rules 11.1(a), 11.9(b), 11.23, and 11.24 To Add a New Time-in-Force Designation Known as “Regular `til Post Market”
Cboe BZX Exchange is adding a new order option called “Regular ’til Post Market” that lets traders keep their orders active through the regular trading day and into the post-market session. This change affects anyone trading stocks on BZX and helps them trade more flexibly without extra fees. The new rule is effective immediately, so traders can start using it right away!
Next: 2026-18808, Self-Regulatory Organizations; The Nasdaq Stock Market LLC; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Amend Exchange Rule Equity 7 Regarding Pricing of Ports for the Night Session
Nasdaq is updating its rules to make it clearer how much it costs to connect to its Night Session trading and is offering some fee waivers to encourage more members to join. This change affects traders and firms using Nasdaq’s Night Session ports and takes effect right away, potentially saving them money. It’s a smart move to boost after-hours trading with simpler fees and some free passes!