Pursuant to Section 19(b)(1) of the Securities Exchange Act of 1934 (the “Act”),^[1] and Rule 19b-4 thereunder,^[2] notice is hereby given that on August 12, 2026, Miami International Securities Exchange, LLC (“MIAX” or “Exchange”) filed with the Securities and Exchange Commission (“Commission”) the proposed rule change as described in Items I, II, and III below, which Items have been prepared by the Exchange. The Commission is publishing this notice to solicit comments on the proposed rule change from interested persons.

I. Self-Regulatory Organization's Statement of the Terms of Substance of the Proposed Rule Change

The Exchange proposes to delay implementation of the proposed change to Exchange Rule 515A, MIAX Price Improvement Mechanism (“PRIME”) and PRIME Solicitation Mechanism, to permit orders for the accounts of Market Makers assigned in the applicable options class, to be solicited as a contra party to the Agency Order submitted for execution in a PRIME or cPRIME Auction.

The text of the proposed rule change is available on the Exchange's website at www.miaxglobal.com/​markets/​ ( printed page 55924) us-options/​all-options-exchanges/​rule-filings and at MIAX's principal office.

II. Self-Regulatory Organization's Statement of the Purpose of, and Statutory Basis for, the Proposed Rule Change

In its filing with the Commission, the Exchange included statements concerning the purpose of and basis for the proposed rule change and discussed any comments it received on the proposed rule change. The text of these statements may be examined at the places specified in Item IV below. The Exchange has prepared summaries, set forth in sections A, B, and C below, of the most significant aspects of such statements.

A. Self-Regulatory Organization's Statement of the Purpose of, and Statutory Basis for, the Proposed Rule Change

1. Purpose

On May 15, 2026, the Exchange filed a proposal ^[3] to amend Exchange Rule 515A, MIAX Price Improvement Mechanism (“PRIME”) and PRIME Solicitation Mechanism, to permit orders for the accounts of Market Makers ^[4] assigned in the applicable options class, to be solicited as a contra party to the Agency Order ^[5] submitted for execution in a PRIME or cPRIME Auction.^[6] The proposal indicated that the Exchange would the implement this functionality in Q3 of 2026 and would publish a Regulatory Circular at least 30 days prior to the implementation date. The Exchange has not issued a Regulatory Circular as described above and now proposes to delay the implementation of this functionality until Q2 of 2027.

The Exchange proposes this delay in order to allow the Exchange and its Members ^[7] ample time to complete the necessary technical changes prior to the implementation of the change. The Exchange proposes to issue a Regulatory Circular notifying market participants at least 30 days prior to implementing this functionality.

2. Statutory Basis

The Exchange believes that its proposed rule change is consistent with Section 6(b) of the Act ^[8] in general, and furthers the objectives of Section 6(b)(5) of the Act ^[9] in particular, in that it is designed to prevent fraudulent and manipulative acts and practices, to promote just and equitable principles of trade, to foster cooperation and coordination with persons engaged in regulating, clearing, settling, processing information with respect to, and facilitating transactions in securities, to remove impediments to and perfect the mechanisms of a free and open market and a national market system and, in general, to protect investors and the public interest by allowing the Exchange and its Members additional time to implement the proposed change.

B. Self-Regulatory Organization's Statement on Burden on Competition

The Exchange does not believe that the proposed rule change will result in any burden on competition that is not necessary or appropriate in furtherance of the purposes of the Act. The Exchange's proposal to delay the implementation of the proposed functionality does not impose an undue burden on competition. Delaying the implementation will simply allow the Exchange and its Members additional time to properly prepare for, and implement, the proposed functionality.

The Exchange does not believe that the proposed rule change will impose any burden on intramarket competition as the delay will apply equally to all Members of the Exchange.

The Exchange does not believe that the proposed rule change will impose any burden on intermarket competition as the proposal is to delay the implementation of approved functionality and does not impact intermarket competition.

C. Self-Regulatory Organization's Statement on Comments on the Proposed Rule Change Received From Members, Participants, or Others

Written comments were neither solicited nor received.

III. Date of Effectiveness of the Proposed Rule Change and Timing for Commission Action

Because the foregoing proposed rule change does not: (i) significantly affect the protection of investors or the public interest; (ii) impose any significant burden on competition; and (iii) become operative for 30 days after the date of the filing, or such shorter time as the Commission may designate, it has become effective pursuant to Section 19(b)(3)(A)(iii) of the Act ^[10] and subparagraph (f)(6) of Rule 19b-4 thereunder.^[11]

At any time within 60 days of the filing of such proposed rule change, the Commission summarily may temporarily suspend such rule change if it appears to the Commission that such action is necessary or appropriate in the public interest, for the protection of investors, or otherwise in furtherance of the purposes of the Act. If the Commission takes such action, the Commission shall institute proceedings under Section 19(b)(2)(B) ^[12] of the Act to determine whether the proposed rule change should be approved or disapproved.

IV. Solicitation of Comments

Interested persons are invited to submit written data, views and arguments concerning the foregoing, including whether the proposed rule change is consistent with the Act. Comments may be submitted by any of the following methods:

Electronic Comments

• Use the Commission's internet comment form (www.sec.gov/​rules/​sro.shtml); or
• Send an email torule-comments@sec.gov. Please include file number SR-MIAX-2026-35 on the subject line.

Paper Comments

• Send paper comments in triplicate to Secretary, Securities and Exchange ( printed page 55925) Commission, 100 F Street NE, Washington, DC 20549-1090.

All submissions should refer to file number SR-MIAX-2026-35. This file number should be included on the subject line if email is used. To help the Commission process and review your comments more efficiently, please use only one method. The Commission will post all comments on the Commission's internet website ( www.sec.gov/​rules/​sro.shtml). Copies of the filing will be available for inspection and copying at the principal office of the Exchange. Do not include personal identifiable information in submissions; you should submit only information that you wish to make available publicly. We may redact in part or withhold entirely from publication submitted material that is obscene or subject to copyright protection. All submissions should refer to file number SR-MIAX-2026-35 and should be submitted on or before September 21, 2026.