Miami International GC sells 79,361 shares

Q: How many MIAX shares did Barbara J. Comly sell?

Barbara J. Comly sold 79,361 MIAX shares across two transactions: 23,339 shares on November 2, 2026, and 56,022 shares on November 4, 2026. Both were direct common-stock sales reported in the transaction data.

Q: What prices did Barbara J. Comly receive for MIAX shares?

The reported weighted-average price was $35.10 per share on November 2, 2026, with trades ranging from $35.00 to $35.23. On November 4, 2026, the weighted-average price was $35.07 per share, with trades ranging from $35.00 to $35.27.

The sales were reported under a previously established trading plan adopted December 18, 2025; the exercised options were fully vested.

Available on EDGAR 11/04/2026 - 04:52 PM EST Accepted by SEC EDGAR 11/04/2026 - 04:52 PM EST

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Form Type

Rhea-AI Filing Summary

Miami International Holdings, Inc. reported that Barbara J. Comly, EVP, GC & Corporate Secretary, exercised options for 23,339 shares on November 2, 2026, and options for 8,799 and 47,223 shares on November 4, 2026, each at a $12.00 exercise price. She sold 23,339 shares on November 2 at a weighted-average $35.10 per share and 56,022 shares on November 4 at a weighted-average $35.07 per share. The transactions were effected under a previously established Rule 10b5-1 Plan adopted on December 18, 2025; the options were fully vested.

Insider Trade Summary 10b5-1

Exercise and Sale: 79,361 shares ($1.83M approx. pre-tax spread)

Exercise and Sale 8 txns

Insider Comly Barbara J.

Role EVP, GC & Corporate Secretary

Sold 79,361 shs ($2.78M)

Approx. gross sale proceeds $2.78M

Approx. exercise cost $952K

Approx. pre-tax spread $1.83M

Share of Position Sold 8.6%

Type	Security	Shares	Price	Value
Exercise	Nonqualified Stock Option (Right to Buy) ^{F1, F4}	8,799	$0.00	$0.00
Exercise	Nonqualified Stock Option (Right to Buy) ^{F1, F4}	47,223	$0.00	$0.00
Exercise	Common Stock ^F1	8,799	$12.00	$106K
Exercise	Common Stock ^F1	47,223	$12.00	$567K
Sale	Common Stock ^{F1, F3}	56,022	$35.07	$1.96M
Exercise	Nonqualified Stock Option (Right to Buy) ^{F1, F4}	23,339	$0.00	$0.00
Exercise	Common Stock ^F1	23,339	$12.00	$280K
Sale	Common Stock ^{F1, F2}	23,339	$35.10	$819K

Holdings After Transaction: Nonqualified Stock Option (Right to Buy) — 94,444 contracts (Direct); Common Stock — 839,564 shares (Direct)

Holdings Before and After: Nonqualified Stock Option (Right to Buy), 173,805 to 94,444 contracts (Direct); Common Stock, 839,564 to 839,564 shares (Direct)

Other Insiders: 1 other insider reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (4)

F1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.
F2. This transaction was executed in multiple trades throughout the day at prices ranging from $35.00 to $35.23. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F3. This transaction was executed in multiple trades throughout the day at prices ranging from $35.00 to $35.27. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F4. The options are fully vested.

Key Figures

Shares sold: 79,361 shares Options exercised and shares sold: 23,339 shares Weighted-average sale price: $35.10 per share +5 more

8 metrics

Shares sold 79,361 shares Across November 2 and November 4, 2026

Options exercised and shares sold 23,339 shares November 2, 2026

Weighted-average sale price $35.10 per share November 2, 2026

Options exercised 8,799 shares November 4, 2026

Options exercised 47,223 shares November 4, 2026

Shares sold 56,022 shares November 4, 2026

Weighted-average sale price $35.07 per share November 4, 2026

Exercise price $12.00 per share The reported option exercises

Key Terms

Rule 10b5-1 Plan, Nonqualified Stock Option (Right to Buy), weighted average sales price, fully vested

4 terms

Rule 10b5-1 Plan regulatory

"a previously established Rule 10b5-1 Plan adopted on December 18, 2025"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

Nonqualified Stock Option (Right to Buy) financial

"Nonqualified Stock Option (Right to Buy)"

weighted average sales price financial

"the price reported above reflects the weighted average sales price"

fully vested financial

"The options are fully vested"

FAQ

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

How many MIAX shares did Barbara J. Comly sell?

Barbara J. Comly sold 79,361 MIAX shares across two transactions: 23,339 shares on November 2, 2026, and 56,022 shares on November 4, 2026. Both were direct common-stock sales reported in the transaction data.

What prices did Barbara J. Comly receive for MIAX shares?

The reported weighted-average price was $35.10 per share on November 2, 2026, with trades ranging from $35.00 to $35.23. On November 4, 2026, the weighted-average price was $35.07 per share, with trades ranging from $35.00 to $35.27.

When were Barbara J. Comly's exercised MIAX options set to expire?

The 23,339-share option exercise on November 2, 2026, and the 8,799-share option exercise on November 4, 2026, were tied to options expiring May 28, 2028. The 47,223-share option exercise on November 4, 2026, was tied to options expiring July 31, 2029.

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

Form 4 Insider Transactions: What Each Field Means →

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Comly Barbara J.

(Last)

(First)

(Middle)

C/O MIAMI INTERNATIONAL HOLDINGS, INC.

7 ROSZEL ROAD, SUITE 1A

(Street)

PRINCETON

NEW JERSEY

08540

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MIAMI INTERNATIONAL HOLDINGS, INC. [ MIAX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	EVP, GC & Corporate Secretary

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/02/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	11/02/2026		M⁽¹⁾		23,339	A	$12	862,903	D
Common Stock	11/02/2026		S⁽¹⁾		23,339	D	$35.1⁽²⁾	839,564	D
Common Stock	11/04/2026		M⁽¹⁾		8,799	A	$12	848,363	D
Common Stock	11/04/2026		M⁽¹⁾		47,223	A	$12	895,586	D
Common Stock	11/04/2026		S⁽¹⁾		56,022	D	$35.07⁽³⁾	839,564	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Nonqualified Stock Option (Right to Buy)	$12	11/02/2026		M⁽¹⁾			23,339	⁽⁴⁾	05/28/2028	Common Stock	23,339	$0	8,799	D
Nonqualified Stock Option (Right to Buy)	$12	11/04/2026		M⁽¹⁾			8,799	⁽⁴⁾	05/28/2028	Common Stock	8,799	$0	0	D
Nonqualified Stock Option (Right to Buy)	$12	11/04/2026		M⁽¹⁾			47,223	⁽⁴⁾	07/31/2029	Common Stock	47,223	$0	94,444	D

Explanation of Responses:

1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

2. This transaction was executed in multiple trades throughout the day at prices ranging from $35.00 to $35.23. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

3. This transaction was executed in multiple trades throughout the day at prices ranging from $35.00 to $35.27. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

4. The options are fully vested.

Remarks:

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	11/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR