MIAMI INTERNATIONAL HOLDINGS, INC. SEC Filing

MIAX submitted a Form 144 disclosing an intended sale of 17,334 shares of Common Stock through exercise of stock options on 04/07/2026.

Accepted by SEC EDGAR 04/07/2026 - 04:29 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MIAX submitted a Form 144 disclosing an intended sale of 17,334 shares of Common Stock through exercise of stock options on 04/07/2026. The filing lists an aggregate value of $721,614.42 and an exchange of NYSE.

Separately, the filing shows recent 10b5-1 dispositions by Shelly Brown of 2,357 shares for $97,419.76 on 04/06/2026 and 25,932 shares for $1,019,979.58 on 03/23/2026. Shares outstanding are listed as 91,651,482 as of 04/07/2026.

Key Figures

Shares offered via exercise: 17,334 shares Aggregate value (exercise line): $721,614.42 Shares outstanding: 91,651,482 shares +4 more

7 metrics

Shares offered via exercise 17,334 shares exercise of stock options on 04/07/2026

Aggregate value (exercise line) $721,614.42 associated with the 17,334-share exercise

Shares outstanding 91,651,482 shares as of 04/07/2026

10b5-1 sale on 04/06/2026 2,357 shares Shelly Brown 10b5-1 sale

Proceeds on 04/06/2026 $97,419.76 Shelly Brown 10b5-1 sale

10b5-1 sale on 03/23/2026 25,932 shares Shelly Brown 10b5-1 sale

Proceeds on 03/23/2026 $1,019,979.58 Shelly Brown 10b5-1 sale

Key Terms

Form 144, 10b5-1, Exercise of Stock Options, Shares outstanding

4 terms

Form 144 regulatory

"144: Filer Information 144: Issuer Information 144: Securities Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

10b5-1 regulatory

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

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"Common | 04/07/2026 | Exercise of Stock Options | Issuer"

Shares outstanding market

"91651482 | 04/07/2026"

Shares outstanding are the total number of a company’s stock units held by all shareholders, including institutional investors and company insiders — think of them as the total number of slices of the company’s ownership pie. Investors use this number to calculate how much of the company each share represents, and it directly affects per-share measures like earnings per share, ownership percentage and valuation; when the slice count changes, an investor’s claim and the company’s per-share metrics change too.

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	17334	721614.42	91651482	04/07/2026	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	04/07/2026	Exercise of Stock Options	Issuer			17334	04/07/2026	Cash

* 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	04/06/2026	2357	97419.76
10b5-1 Sales for SHELLY BROWN 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	03/23/2026	25932	1019979.58

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	04/07/2026
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)