Miami International (MIAX) CFO sells 35,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) reported that EVP and CFO Lance Emmons sold 35,000 shares of common stock on 2026-08-17 in an open-market transaction at a weighted average price of $42.83 per share. After this sale, he directly holds 86,538 shares. The sale was executed under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025, and was completed in multiple trades at prices ranging from $42.23 to $43.54.

Insider Trade Summary 10b5-1

Net Seller: 35,000 shares

Net Sell 1 txn

Insider Emmons Lance

Role EVP and CFO

Sold 35,000 shs ($1.50M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	35,000	$42.83	$1.50M

Holdings After Transaction: Common Stock — 86,538 shares (Direct)

Footnotes (2)

1. F1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.
2. F2. This transaction was executed in multiple trades throughout the day at prices ranging from $42.23 to $43.54. 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.

Key Figures

Shares sold: 35,000 shares Weighted average sale price: $42.83 per share Price range of trades: $42.23 to $43.54 per share +2 more

5 metrics

Shares sold 35,000 shares Common stock sale on 2026-08-17 by EVP and CFO Lance Emmons

Weighted average sale price $42.83 per share Weighted average price for 35,000 MIAX shares sold on 2026-08-17

Price range of trades $42.23 to $43.54 per share Range of prices for multiple trades comprising the 35,000-share sale

Shares held after transaction 86,538 shares Direct MIAX common stock ownership by Lance Emmons following the sale

10b5-1 plan adoption date December 17, 2025 Date Lance Emmons adopted the Rule 10b5-1 trading plan used for this sale

Key Terms

Rule 10b5-1 Plan, weighted average sales price, Form 4, non-derivative

4 terms

Rule 10b5-1 Plan regulatory

"This transaction was effected pursuant to a previously established Rule 10b5-1 Plan"

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.

weighted average sales price financial

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

Form 4 regulatory

"In this MIAX Form 4, Lance Emmons is identified as EVP and CFO"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

non-derivative financial

"transaction_type: non-derivative for the reported common stock sale"

FAQ

What insider transaction did MIAX report for Lance Emmons?

MIAX reported that EVP and CFO Lance Emmons sold 35,000 shares of common stock on 2026-08-17 at a weighted average price of $42.83 per share under a pre-established Rule 10b5-1 trading plan.

At what prices did Lance Emmons sell MIAX shares on 2026-08-17?

The MIAX insider sale by Lance Emmons was executed in multiple trades at prices between $42.23 and $43.54 per share. The reported $42.83 is the weighted average sales price for the 35,000 shares sold.

How many MIAX shares does Lance Emmons hold after the reported sale?

After selling 35,000 shares, Lance Emmons directly holds 86,538 shares of MIAX common stock. This post-transaction holding reflects his remaining direct ownership as reported in the Form 4 filing.

Was the MIAX insider sale by Lance Emmons under a Rule 10b5-1 plan?

Yes. The sale of 35,000 MIAX shares by Lance Emmons was executed under a previously established Rule 10b5-1 Plan adopted on December 17, 2025, indicating the trades were pre-arranged.

What role does Lance Emmons hold at MIAX in this Form 4 filing?

In this MIAX Form 4, Lance Emmons is identified as EVP and CFO. The filing reports his disposition of 35,000 shares of MIAX common stock and shows remaining direct ownership of 86,538 shares.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/19/2026 - 04:11 PM Accepted by SEC EDGAR 08/19/2026 - 04:10 PM Learn about SEC filing dates

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).

X

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^*

Emmons Lance

(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 and CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/17/2026		S(1)		35,000	D	$42.83(2)	86,538	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

2. This transaction was executed in multiple trades throughout the day at prices ranging from $42.23 to $43.54. 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.

Remarks:

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	08/19/2026
	** 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)