MIAX insider plans sale of 44,000 common shares

MIAX reports a proposed sale of 44,000 shares of common stock through Morgan Stanley Smith Barney LLC’s Executive Financial Services program.

Rhea-AI Filing Summary

MIAX reports a proposed sale of 44,000 shares of common stock through Morgan Stanley Smith Barney LLC’s Executive Financial Services program. The shares are tied to an exercise of stock options dated 08/04/2026, with an aggregate market value of $2,060,520.00 and are listed on the NYSE.

The disclosure also lists prior Rule 10b5-1 plan sales for Edward Deitzel of 11,000 common shares on 06/02/2026 for $463,766.99 and 11,000 common shares on 07/06/2026 for $462,442.91.

Key Figures

Shares to be sold: 44,000 shares Aggregate market value: $2,060,520.00 10b5-1 sale 1: 11,000 shares for $463,766.99 +2 more

5 metrics

Shares to be sold 44,000 shares Common stock planned for sale related to stock option exercise on 08/04/2026

Aggregate market value $2,060,520.00 Aggregate market value of 44,000 common shares listed on NYSE

10b5-1 sale 1 11,000 shares for $463,766.99 Common shares sold on 06/02/2026 under a 10b5-1 plan for Edward Deitzel

10b5-1 sale 2 11,000 shares for $462,442.91 Common shares sold on 07/06/2026 under a 10b5-1 plan for Edward Deitzel

Exchange NYSE Listing exchange for the 44,000 common shares covered

Key Terms

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

4 terms

Form 144 regulatory

"144: Securities Information Common | Morgan Stanley Smith Barney LLC Executive"

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.

Rule 10b5-1 regulatory

"10b5-1 Sales for EDWARD DEITZEL 7 Roszel Road, Suite 1A"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

Exercise of Stock Options financial

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

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services 1"

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 does MIAX’s Form 144 disclose about the new stock sale?

The disclosure shows a planned sale of 44,000 MIAX common shares related to an exercise of stock options on 08/04/2026, with an aggregate market value of $2,060,520.00 for NYSE-listed stock.

How many MIAX (MIAX) shares are covered by the current Form 144?

The current notice covers 44,000 shares of MIAX common stock. These shares are associated with an exercise of stock options and are expected to be sold through Morgan Stanley Smith Barney LLC’s Executive Financial Services platform.

What prior 10b5-1 sales are reported for MIAX insider Edward Deitzel?

The disclosure lists two 10b5-1 plan sales for Edward Deitzel: 11,000 common shares on 06/02/2026 for $463,766.99 and 11,000 shares on 07/06/2026 for $462,442.91.

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

The shares covered by this notice are listed on the NYSE. The filing specifies that 44,000 common shares with an aggregate market value of $2,060,520.00 are NYSE-traded securities.

What is the relationship between the MIAX shares to be sold and stock options?

The 44,000 MIAX common shares relate to an exercise of stock options dated 08/04/2026. The transaction description identifies the upcoming sale as connected to this option exercise, with consideration in cash.

Who is the broker involved in the MIAX Form 144 transaction?

The broker listed is Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, handling the planned sale of 44,000 MIAX common shares on the NYSE.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 08/04/2026 - 04:31 PM Accepted by SEC EDGAR 08/04/2026 - 04:30 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	0002080671
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	EDWARD DEITZEL
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	44000	2060520.00	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			44000	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 EDWARD DEITZEL 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	07/06/2026	11000	462442.91
10b5-1 Sales for EDWARD DEITZEL 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	06/02/2026	11000	463766.99

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	08/04/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/30/2025
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/ Edward Deitzel
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)