Miami International officer proposes $5.09M share sale

The shares are tied to option exercises over the next three months, with acquisition and payment dates aligned to exercise and sale.

Available on EDGAR 11/04/2026 - 04:34 PM EST Accepted by SEC EDGAR 11/04/2026 - 04:34 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) officer Barbara J. Comly gave notice of a proposed sale of 150,466 common shares, with an aggregate market value of $5,094,778.76. The notice lists November 4, 2026 as the approximate sale date and names Morgan Stanley Smith Barney LLC as broker.

Comly's remarks state that the shares were and will be received upon exercise of stock options over the next three months, with acquisition and payment dates tied to exercise and sale. Her prior three-month sales, labeled 10b5-1 sales, were 23,339 shares for $819,245.58 on November 2, 2026; 12,306 shares for $431,250.23 on October 22, 2026; and 44,445 shares for $1,799,698.05 on September 2, 2026.

Key Figures

Shares proposed for sale: 150,466 common shares Aggregate market value: $5,094,778.76 Shares outstanding: 100,056,866 shares +3 more

6 metrics

Shares proposed for sale 150,466 common shares Approximate sale date November 4, 2026

Aggregate market value $5,094,778.76 Proposed sale

Shares outstanding 100,056,866 shares Issuer share count listed in the securities information

Prior sale 23,339 shares; $819,245.58 November 2, 2026; labeled 10b5-1 sales

Prior sale 12,306 shares; $431,250.23 October 22, 2026; labeled 10b5-1 sales

Prior sale 44,445 shares; $1,799,698.05 September 2, 2026; labeled 10b5-1 sales

Key Terms

Stock Options, 10b5-1 Sales, NYSE

3 terms

Stock Options financial

"Exercise of Stock Options"

Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.

10b5-1 Sales financial

"10b5-1 Sales for BARBARA J COMLY"

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.

NYSE market

"NYSE"

A large, regulated marketplace where stocks and other securities are listed and traded, acting like a global auction house that matches buyers and sellers and helps determine share prices. It matters to investors because listing and trading there provide liquidity, price discovery, and regulatory oversight—making it easier to buy or sell holdings and giving companies a visible platform that can affect credibility and access to capital.

FAQ

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

How many MIAX shares did Barbara J. Comly propose to sell?

Barbara J. Comly's notice lists a proposed sale of 150,466 common shares with an aggregate market value of $5,094,778.76. It names November 4, 2026 as the approximate sale date and Morgan Stanley Smith Barney LLC as broker.

How will Barbara J. Comly receive the MIAX shares for sale?

Comly's remarks state that the securities were and will be received upon exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise and sale.

What were Barbara J. Comly's recent MIAX share sales?

The reported prior sales labeled 10b5-1 sales were 23,339 shares for $819,245.58 on November 2, 2026; 12,306 shares for $431,250.23 on October 22, 2026; and 44,445 shares for $1,799,698.05 on September 2, 2026.

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

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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	0002080878
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	BARBARA J. COMLY
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	150466	5094778.76	100056866	11/04/2026	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	11/04/2026	Exercise of Stock Options	Issuer			150466	11/04/2026	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 BARBARA J COMLY 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	11/02/2026	23339	819245.58
10b5-1 Sales for BARBARA J COMLY 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	10/22/2026	12306	431250.23
10b5-1 Sales for BARBARA J COMLY 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	09/02/2026	44445	1799698.05

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	11/04/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/18/2025
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/ Barbara J. Comly
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)