Form 144: 9,000 MIAX Shares Notice by Teekell

J. Gray Teekell submitted a Form 144 notice to sell 9,000 shares of Common Stock of the issuer.

Rhea-AI Filing Summary

J. Gray Teekell submitted a Form 144 notice to sell 9,000 shares of Common Stock of the issuer. The filing lists prior 10b5-1 sales of 2,700 shares on 04/02/2026 for $108,000 and 300 shares on 03/25/2026 for $12,000. The securities to be sold are identified as previously exercised stock options dated 03/27/2024.

Key Figures

Shares proposed for sale: 9,000 shares 10b5-1 sale on 04/02/2026: 2,700 shares 10b5-1 sale on 03/25/2026: 300 shares +1 more

4 metrics

Shares proposed for sale 9,000 shares Securities To Be Sold line

10b5-1 sale on 04/02/2026 2,700 shares Sale executed under 10b5-1 for proceeds $108,000

10b5-1 sale on 03/25/2026 300 shares Sale executed under 10b5-1 for proceeds $12,000

Exercise date 03/27/2024 Previously exercised stock options dated

Key Terms

Form 144, 10b5-1, Previously Exercised Stock Options

3 terms

Form 144 regulatory

"submitted a Form 144 notice to sell 9,000 common shares"

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 J GRAY TEEKELL listed with dates and amounts"

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.

Previously Exercised Stock Options financial

"Securities To Be Sold line lists Previously Exercised Stock Options dated 03/27/2024"

FAQ

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

What does the MIAX Form 144 filed by J. Gray Teekell report?

It reports a proposed sale of 9,000 common shares. The notice also lists prior 10b5-1 dispositions of 2,700 shares on 04/02/2026 for $108,000 and 300 shares on 03/25/2026 for $12,000.

Were any shares already sold before this Form 144 for MIAX?

Yes — recent 10b5-1 sales are listed. The filing shows 2,700 shares sold on 04/02/2026 and 300 shares sold on 03/25/2026, with proceeds of $108,000 and $12,000 respectively.

What is the source of the shares being offered in the Form 144 for MIAX?

The shares are described as from previously exercised stock options. The exercise date shown in the filing is 03/27/2024, and the notice lists 9,000 shares to be sold.

Do the Form 144 entries indicate a trading plan for J. Gray Teekell?

The filing references 10b5-1 sales. That indicates at least some prior sales were executed under a 10b5-1 arrangement; the filing lists specific dates and amounts for those sales.

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

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Accepted by SEC EDGAR 05/04/2026 - 04:32 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	0001959770
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	J. GRAY TEEKELL
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

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	9000	424530.00	91651482	05/04/2026	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	03/27/2024	Previously Exercised Stock Options	Issuer			9000	03/27/2024	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 J GRAY TEEKELL 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	04/02/2026	2700	108000.00
10b5-1 Sales for J GRAY TEEKELL 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	03/25/2026	300	12000.00

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon previously exercised options during the period of 03/27/2024 through 08/01/2024.
Date of Notice	05/04/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/17/2025
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/ J. Gray Teekell
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)