MIAX insider files to sell 32,000 shares

MIAX reported a Rule 144 notice to sell 32,000 shares of Common Stock dated 05/04/2026, described as resulting from an exercise of stock options and to be sold for cash.

Rhea-AI Filing Summary

MIAX reported a Rule 144 notice to sell 32,000 shares of Common Stock dated 05/04/2026, described as resulting from an exercise of stock options and to be sold for cash. The filing also lists recent 10b5-1 plan sales by Shelly Brown totaling 45,623 shares across 03/23/2026–04/08/2026 with disclosed proceeds.

Key Figures

Shares to be sold: 32,000 shares 10b5-1 sale on 03/23/2026: 25,932 shares 10b5-1 sale proceeds (03/23/2026): $1,019,979.58 +3 more

6 metrics

Shares to be sold 32,000 shares listed under Securities To Be Sold dated 05/04/2026

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

10b5-1 sale proceeds (03/23/2026) $1,019,979.58 Proceeds disclosed for 25,932 shares on 03/23/2026

10b5-1 sale on 04/08/2026 16,434 shares 10b5-1 Sales for Shelly Brown on 04/08/2026

10b5-1 sale proceeds (04/08/2026) $691,467.12 Proceeds disclosed for 16,434 shares on 04/08/2026

Aggregate 10b5-1 shares shown 45,623 shares Sum of listed 10b5-1 trades dated 03/23–04/08/2026

Key Terms

Rule 144, 10b5-1, Exercise of Stock Options

3 terms

Rule 144 regulatory

"144: Securities To Be Sold"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 regulatory

"10b5-1 Sales for SHELLY BROWN"

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

"Exercise of Stock Options | Issuer | 32000"

FAQ

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

What does the MIAX Form 144 report?

The filing reports a Rule 144 notice to sell 32,000 shares dated 05/04/2026. It states the shares arise from an exercise of stock options and will be sold for cash.

Who made recent 10b5-1 sales shown in the filing?

The filing lists Shelly Brown as the 10b5-1 plan seller. The entries cover sales on 03/23/2026, 04/06/2026, 04/07/2026, and 04/08/2026 with disclosed share counts and proceeds.

How many shares were sold under the 10b5-1 plan in the past three months?

The summed entries show sales of 25,932, 2,357, 900, and 16,434 shares on listed dates, totaling 45,623 shares sold under the 10b5-1 plan in the period shown.

What proceeds were disclosed for recent 10b5-1 transactions?

The filing discloses proceeds for individual trades: $1,019,979.58, $97,419.76, $37,800.00, and $691,467.12 for the listed 10b5-1 sales by Shelly Brown.

Are the 32,000 shares being sold part of an option exercise?

Yes. The securities-to-be-sold line explicitly labels the 32,000 common shares as arising from an exercise of stock options with the sale method indicated as cash.

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

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Accepted by SEC EDGAR 05/04/2026 - 04:31 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	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	32000	1509440.00	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	05/04/2026	Exercise of Stock Options	Issuer			32000	05/04/2026	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 SHELLY BROWN 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	04/08/2026	16434	691467.12
10b5-1 Sales for SHELLY BROWN 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	04/07/2026	900	37800.00
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	05/04/2026
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)