MIAX director reports vested stock option holdings

MIAMI INTERNATIONAL HOLDINGS, INC. director Jill E. Sommers filed an initial ownership report showing vested stock option holdings in MIAX common stock.

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. director Jill E. Sommers filed an initial ownership report showing vested stock option holdings in MIAX common stock. The filing lists three nonqualified stock option awards, each giving the right to buy shares at fixed exercise prices before specified expiration dates.

One option covers 2,709 underlying common shares at an exercise price of $20.60 per share, expiring on December 28, 2033. A second option covers 8,792 underlying shares at $20.00 per share, expiring on March 31, 2034. A third option covers 8,306 underlying shares at $22.34 per share, expiring on March 4, 2035. A footnote states that all of these options are fully vested.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Sommers Jill E.

Role Director

Type	Security	Shares	Price	Value
holding	Nonqualified Stock Option (Right to Buy)	--	--	--
holding	Nonqualified Stock Option (Right to Buy)	--	--	--
holding	Nonqualified Stock Option (Right to Buy)	--	--	--

Holdings After Transaction: Nonqualified Stock Option (Right to Buy) — 19,807 contracts (Direct)

Footnotes (1)

1. F1. The options are fully vested.

Key Figures

Option 1 underlying shares: 2,709 shares Option 1 exercise price: $20.60/share Option 2 underlying shares: 8,792 shares +3 more

6 metrics

Option 1 underlying shares 2,709 shares Nonqualified Stock Option at $20.60, expiring December 28, 2033

Option 1 exercise price $20.60/share Nonqualified Stock Option, expiration December 28, 2033

Option 2 underlying shares 8,792 shares Nonqualified Stock Option at $20.00, expiring March 31, 2034

Option 2 exercise price $20.00/share Nonqualified Stock Option, expiration March 31, 2034

Option 3 underlying shares 8,306 shares Nonqualified Stock Option at $22.34, expiring March 4, 2035

Option 3 exercise price $22.34/share Nonqualified Stock Option, expiration March 4, 2035

Key Terms

Nonqualified Stock Option (Right to Buy), Form 3, underlying security shares, exercise price, +1 more

5 terms

Nonqualified Stock Option (Right to Buy) financial

"security_title: Nonqualified Stock Option (Right to Buy)"

Form 3 regulatory

"INSIDER FILING DATA (Form 3)"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

underlying security shares financial

"underlying_security_shares: "8792.0000""

exercise price financial

"conversion_or_exercise_price: "22.3400""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

fully vested financial

"The options are fully vested."

FAQ

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

What does the MIAX Form 3 filed by Jill E. Sommers show?

The Form 3 shows Jill E. Sommers’ existing holdings of fully vested nonqualified stock options in MIAMI INTERNATIONAL HOLDINGS, INC. It lists three option grants, each with a specific exercise price, number of underlying MIAX common shares, and long-dated expiration.

How many MIAX shares are covered by Jill Sommers’ $20.00 stock options?

Jill Sommers holds nonqualified stock options covering 8,792 underlying MIAX common shares at a $20.00 exercise price. These options are fully vested and carry an expiration date of March 31, 2034, giving a long window to decide whether to exercise.

What are the exercise prices of Jill Sommers’ MIAX stock options?

Jill Sommers’ MIAX stock options have exercise prices of $20.00, $20.60, and $22.34 per share. Each price applies to a separate fully vested option award, with its own number of underlying common shares and expiration date extending into 2033, 2034, and 2035.

When do Jill Sommers’ MIAX nonqualified stock options expire?

Her MIAX nonqualified stock options expire on December 28, 2033, March 31, 2034, and March 4, 2035. Each expiration date corresponds to a different fully vested option grant, providing staggered long-term opportunities to purchase MIAX common stock at preset prices.

Are Jill Sommers’ MIAX stock options fully vested according to the Form 3?

Yes. A footnote in the Form 3 states that the reported nonqualified stock options are fully vested. This means Sommers has already satisfied any vesting conditions and can choose whether to exercise these options for MIAX common stock before their respective expiration dates.

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

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Accepted by SEC EDGAR 03/31/2026 - 04:28 PM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Sommers Jill E.

(Last) (First) (Middle)

C/O MIAMI INTERNATIONAL HOLDINGS, INC.

7 ROSZEL ROAD, SUITE 1

(Street)

PRINCETON NEW JERSEY 08540

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/25/2026

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

3a. Foreign Trading Symbol

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Nonqualified Stock Option (Right to Buy)	(1)	12/28/2033	Common Stock	2,709	$20.6	D
Nonqualified Stock Option (Right to Buy)	(1)	03/31/2034	Common Stock	8,792	$20	D
Nonqualified Stock Option (Right to Buy)	(1)	03/04/2035	Common Stock	8,306	$22.34	D

Explanation of Responses:

1. The options are fully vested.

Remarks:

See Exhibit 24.1 - Power of Attorney

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	03/31/2026
	** 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 5 (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 3: SEC 1473 (03-26)