MIAX Rolls Out SLAP to Purge Unwanted Trading Orders
Published Date: 6/4/2026
Notice
Summary
Miami International Securities Exchange (MIAX) is upgrading its mass cancellation rule to add a cool new feature called Selective Liquidity Auto Purge (SLAP). This lets traders cancel specific groups of orders more precisely and quickly, making trading smoother and smarter. The change is effective immediately, helping members save time and avoid costly mistakes during busy market moments.
Analyzed Economic Effects
4 provisions identified: 3 benefits, 1 costs, 0 mixed.
New SLAP Risk-Management Tool
MIAX is adding a Selective Liquidity Auto Purge (SLAP) feature that lets Members tag Standard quotes with SLAP codes numbered 1 through 8 so they can mass-cancel specific groups of quotes by MPID and underlying. The Exchange says this gives Market Makers an additional risk-management tool to remove particular quote groups quickly.
SLAP Blocks and Rejects Standard Quotes
When a Member submits a SLAP request, Standard quotes matching the same MPID, underlying, and SLAP code will be removed and new inbound Standard quotes with matching criteria will be blocked until a SLAP reset is submitted. Standard quotes received for the same MPID, underlying, and SLAP code prior to a SLAP reset will be rejected; eQuotes are not eligible for SLAP.
MEI Messages Require SLAP Fields
MIAX modified its MIAX Express Interface (MEI) messages: Members will use a new "SLAP Codes" field in the Simple Bulk Quote Message and a new value "S" in the Mass Liquidity Cancel Request and Liquidity Protection Reset Request messages to support SLAP. The Exchange will implement this functionality in Q3 2026 and will notify participants at least 30 days before the exact date.
Expected Improvement in Market Liquidity
The Exchange states that giving Market Makers this SLAP risk tool should instill confidence and encourage them to provide liquidity, thereby improving market quality for all participants. MIAX says this promotes just and equitable principles of trade and protects investors and the public interest.
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
2026-18190, 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!
2026-10373, Registered Offering Reform
The SEC wants to make it easier and cheaper for more companies to sell their stocks and bonds to the public. They’re opening up special forms and benefits to more businesses, updating rules to be more modern, and cutting red tape by overriding some state rules. If you’re a company planning to raise money, these changes could speed things up and save you money, with feedback due by July 27, 2026.
2026-10222, Enhancement of Emerging Growth Company Accommodations and Simplification of Filer Status for Reporting Companies
The SEC is making it easier for companies that report their finances by simplifying their categories into just two groups: big and small filers. Smaller companies, including emerging growth ones, will get more time to file reports and enjoy simpler rules, while big companies keep stricter standards. These changes aim to save time and money, with feedback open until July 20, 2026.
2026-07651, Concept Release on Consolidated Audit Trail and Other Audit Trails and Data Sources
The SEC wants your thoughts on how it tracks stock market trades using the Consolidated Audit Trail and other data tools. They’re thinking about updating rules to keep up with new tech, privacy, and security needs, and to make sure the system is fair and cost-effective. If you’re involved in the stock market or data tracking, speak up by June 22, 2026!
Previous / Next Documents
Previous: 2026-11144, Self-Regulatory Organizations; National Securities Clearing Corporation; Notice of Filing of Proposed Rule Change To Enhance NSCC's Clearing Fund Methodology
The National Securities Clearing Corporation (NSCC) wants to improve how it handles risks from exchange-traded products (ETPs) by updating its Clearing Fund rules. This change affects NSCC members who trade these products and aims to keep the system safer and stronger. The new rules could impact how much money members need to put into the fund, with the proposal open for public comments starting June 2026.
Next: 2026-11146, Self-Regulatory Organizations; 24X National Exchange LLC; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend the Limited Liability Agreement of 24X US Holdings LLC in Connection With a Transaction
24X National Exchange is updating its parent company’s agreement to add new voting shares for Shinhan Securities after they convert a special loan into ownership. This change affects company control and takes effect immediately, with no direct cost impact announced. It’s a smooth move to keep things clear and official as ownership shifts.