Miami International officer plans sale of 21K shares

MIAMI INTERNATIONAL HOLDINGS, INC.

Available on EDGAR 09/16/2026 - 04:29 PM EDT Accepted by SEC EDGAR 09/16/2026 - 04:29 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) discloses that officer Shelly Brown has filed a notice under Rule 144 to sell up to 21,217 shares of common stock, originating from Restricted Stock Awards. The shares are to be sold through Morgan Stanley Smith Barney LLC, with an aggregate market value of $838,283.67 as of September 16, 2026, and are listed on the NYSE.

The notice also reports that, during the prior three months, Brown sold 16,000 shares of MIAX common stock on July 6, 2026 for total proceeds of $674,148.80, identified as 10b5-1 Sales.

Key Figures

Shares to be sold under Rule 144: 21,217 shares Aggregate market value of shares to be sold: $838,283.67 Shares sold in prior 3 months: 16,000 shares +1 more

4 metrics

Shares to be sold under Rule 144 21,217 shares Common stock from Restricted Stock Awards disclosed in the Form 144

Aggregate market value of shares to be sold $838,283.67 Common stock position as of September 16, 2026

Shares sold in prior 3 months 16,000 shares 10b5-1 sales on July 6, 2026

Proceeds from prior 3-month sales $674,148.80 10b5-1 sales of common stock on July 6, 2026

Key Terms

Rule 144, 10b5-1 Sales, Restricted Stock Awards

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 Sales regulatory

"10b5-1 Sales for SHELLY BROWN 7 Roszel Road, Suite 1A"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

Restricted Stock Awards financial

"Common | 09/10/2026 | Restricted Stock Awards | Issuer"

Restricted stock awards are company shares given to employees or executives that cannot be sold or transferred until certain conditions — like staying with the company for a set time or meeting performance targets — are met, like a gift that is locked in a safe until rules are satisfied. Investors care because these awards tie management’s pay to company performance, can increase the number of shares outstanding when they become tradable (dilution), and may signal expected future selling pressure or commitment to long-term growth.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing reveal about MIAX officer Shelly Brown?

It shows that officer Shelly Brown has filed to sell up to 21,217 shares of MIAMI INTERNATIONAL HOLDINGS, INC. common stock under Rule 144, with the shares coming from Restricted Stock Awards and planned to be sold through Morgan Stanley Smith Barney LLC.

How many MIAX shares is Shelly Brown planning to sell under Rule 144?

The notice states that up to 21,217 shares of MIAMI INTERNATIONAL HOLDINGS, INC. common stock are to be sold, tied to Restricted Stock Awards, with an aggregate market value of $838,283.67 as of September 16, 2026.

What prior MIAX stock sales by Shelly Brown are disclosed in this Form 144?

The filing reports that over the past three months, on July 6, 2026, Shelly Brown sold 16,000 shares of MIAX common stock, designated as 10b5-1 Sales, for total proceeds of $674,148.80.

Through which broker will the MIAX shares in this Form 144 be sold?

The common shares are to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY, as stated in the securities information section.

What type of MIAX securities are covered in Shelly Brown’s Form 144 notice?

The notice covers common stock of MIAMI INTERNATIONAL HOLDINGS, INC., with the shares to be sold identified as Restricted Stock Awards and listed on the NYSE.

When were the MIAX shares in this Form 144 acquired and when are they to be sold?

The common shares to be sold are associated with Restricted Stock Awards, with a transaction date of September 10, 2026, and the notice reflects market value information as of September 16, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002080506
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Miami International Holdings, Inc.
SEC File Number	001-42805
Address of Issuer	7 Roszel Road, Suite 1A Princeton NEW JERSEY 08540
Phone	6098977300
Name of Person for Whose Account the Securities are To Be Sold	SHELLY BROWN
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	21217	838283.67	99230898	09/16/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/10/2026	Restricted Stock Awards	Issuer			21217	09/10/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for SHELLY BROWN 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	07/06/2026	16000	674148.80

144: Remarks and Signature

Remarks
Date of Notice	09/16/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/22/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Shelly Brown
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)