MIAX holder plans 48,334-share stock sale

MIAX has a shareholder filing to sell 48,334 shares of common stock, with an aggregate market value of $2,263,481.22.

Rhea-AI Filing Summary

MIAX has a shareholder filing to sell 48,334 shares of common stock, with an aggregate market value of $2,263,481.22. The planned sale on August 4, 2026 is tied to an exercise of stock options for cash. Common shares are listed on the NYSE, and shares outstanding were 94,907,086 at the time of the notice; this is a baseline figure, not the amount being sold.

The filing also lists recent 10b5-1 sales by Gallagher Investments over the prior three months, including multiple transactions between May and July 2026 with share counts ranging from 15,771 to 70,000 and aggregate proceeds in the low-to-mid million-dollar range per trade.

Key Figures

Planned shares to be sold: 48,334 shares Aggregate market value of planned sale: $2,263,481.22 Shares outstanding: 94,907,086 shares +3 more

6 metrics

Planned shares to be sold 48,334 shares Common stock sale tied to option exercise on 08/04/2026

Aggregate market value of planned sale $2,263,481.22 Value of 48,334 shares of common stock

Shares outstanding 94,907,086 shares Common shares outstanding at time of notice

10b5-1 sale on 07/13/2026 70,000 shares; $2,976,698.67 Gallagher Investments common stock sale under 10b5-1

10b5-1 sale on 06/02/2026 70,000 shares; $2,964,969.00 Gallagher Investments common stock sale under 10b5-1

Smallest recent 10b5-1 sale 15,771 shares; $755,757.36 Gallagher Investments sale on 05/05/2026

Key Terms

Form 144, 10b5-1 Sales, Exercise of Stock Options, aggregate market value

4 terms

Form 144 regulatory

"144: Securities To Be Sold"

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 Sales regulatory

"10b5-1 Sales for GALLAGHER INVESTMENTS 7 Roszel Road"

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.

Exercise of Stock Options financial

"Common | 08/04/2026 | Exercise of Stock Options | Issuer"

aggregate market value financial

"| 48334 | 2263481.22 | 94907086 | 08/04/2026"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What stock sale is disclosed for MIAX in this Form 144 filing?

The filing discloses a planned sale of 48,334 MIAX common shares with an aggregate market value of $2,263,481.22. The sale is scheduled for August 4, 2026 and is tied to a cash exercise of stock options.

How many MIAX shares are outstanding according to this Form 144?

The filing states that 94,907,086 MIAX common shares were outstanding when the notice was prepared. This figure provides overall share count context and is not the number of shares being sold under the Form 144.

What recent 10b5-1 sales of MIAX stock by Gallagher Investments are listed?

The notice lists 10b5-1 sales by Gallagher Investments, including trades of 70,000 shares on 06/02/2026 and 70,000 shares on 07/13/2026. Other sales range from 15,771 to 41,772 shares between May and July 2026.

What were the dollar amounts for the recent MIAX 10b5-1 sales in the Form 144?

The 10b5-1 sales show aggregate proceeds such as $2,964,969.00 on 06/02/2026 and $2,976,698.67 on 07/13/2026. Smaller trades include $755,757.36 of proceeds on 05/05/2026 from a 15,771-share sale.

On which exchange are MIAX shares listed in this Form 144 disclosure?

The common shares referenced in the Form 144 are listed on the NYSE. This exchange designation applies to the MIAX common stock that is subject to the planned sale and the previously reported 10b5-1 transactions.

What is the relationship between the MIAX Form 144 sale and stock options?

The planned sale of 48,334 MIAX shares on August 4, 2026 is linked to an exercise of stock options for cash. The options exercise is identified as the source of the shares being sold by the reporting party.

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

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Available on EDGAR 08/04/2026 - 04:36 PM Accepted by SEC EDGAR 08/04/2026 - 04:34 PM 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	48334	2263481.22	94907086	08/04/2026	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	08/04/2026	Exercise of Stock Options	Issuer			48334	08/04/2026	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 GALLAGHER INVESTMENTS 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	07/13/2026	70000	2976698.67
10b5-1 Sales for GALLAGHER INVESTMENTS 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	07/07/2026	28228	1193200.38
10b5-1 Sales for GALLAGHER INVESTMENTS 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	07/06/2026	41772	1758292.77
10b5-1 Sales for GALLAGHER INVESTMENTS 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	06/02/2026	70000	2964969.00
10b5-1 Sales for GALLAGHER INVESTMENTS 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	05/05/2026	15771	755757.36

144: Remarks and Signature

Remarks
Date of Notice	08/04/2026
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)