MIAX Form 144: 350,001-Share Option-Exercise Sale

MIAX submitted a Form 144 notice reporting proposed sales of common stock related to an exercise of stock options and to previously issued restricted stock awards.

Rhea-AI Filing Summary

MIAX submitted a Form 144 notice reporting proposed sales of common stock related to an exercise of stock options and to previously issued restricted stock awards. The filing lists 350,001 shares tied to the option exercise dated 04/15/2026 and 104,124 shares from restricted awards dated 12/01/2023.

Key Figures

Form type: Form 144 Shares from option exercise: 350,001 shares Shares from restricted awards: 104,124 shares

3 metrics

Form type Form 144 Notice of proposed sale

Shares from option exercise 350,001 shares Exercise of Stock Options dated 04/15/2026

Shares from restricted awards 104,124 shares Restricted Stock Awards dated 12/01/2023

Key Terms

Form 144, Exercise of Stock Options, Restricted Stock Awards

3 terms

Form 144 regulatory

"144: Filer Information 144: Issuer 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.

Exercise of Stock Options financial

"Securities To Be Sold ... Exercise of Stock Options"

Restricted Stock Awards financial

"Common | 12/01/2023 | Restricted Stock Awards"

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 MIAX's Form 144 disclose?

The Form 144 discloses proposed sales of common stock related to an option exercise and restricted awards. It lists 350,001 shares tied to an exercise of stock options dated 04/15/2026 and 104,124 shares from restricted awards dated 12/01/2023.

How many shares is the insider planning to sell for MIAX?

The filing lists a proposed sale of 350,001 shares tied to an option exercise and 104,124 shares from restricted stock awards. These are the explicit share counts shown on the Form 144 excerpt provided.

What transaction types are shown on MIAX's Form 144?

The Form 144 excerpt shows two transaction types: an Exercise of Stock Options (resulting in common shares) and dispositions related to Restricted Stock Awards, with the exercise dated 04/15/2026 and awards dated 12/01/2023.

Does the Form 144 state who is selling the MIAX shares?

The excerpt identifies the selling context (option exercise and restricted awards) but does not include a named individual or entity in the provided lines. The filing format indicates issuer-related securities and sale dates without a named seller in this excerpt.

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

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Accepted by SEC EDGAR 04/15/2026 - 04:53 PM EDT Learn about SEC filing dates

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	0002080477
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	GALLAGHER INVESTMENTS LLC
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	Director
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	454125	19486503.75	91651482	04/15/2026	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	04/15/2026	Exercise of Stock Options	Issuer			350001	04/15/2026	Cash
Common	12/01/2023	Restricted Stock Awards	Issuer			104124	12/01/2023	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

Nothing to Report

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock awards during the period of 12/01/2023 through 03/29/2026. 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	04/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/29/2025
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/ Thomas P. Gallagher
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)