MIAX (MIAX) insider plans 180,557-share option exercise sale after 10b5-1 trades

Rhea-AI Filing Summary

MIAX received a notice that Barbara J. Comly intends to sell 180,557 common shares on or after August 4, 2026 through the exercise of stock options for cash. The filing also lists prior Rule 10b5-1 sales of 28,000 shares each on June 2, July 2, and July 13, 2026.

Key Figures

Planned shares to be sold: 180,557 shares Aggregate market value: 8,455,484.31 Recent sale June 2, 2026: 28,000 shares; 1,199,685.20 +2 more

5 metrics

Planned shares to be sold 180,557 shares Common stock to be sold via exercise of stock options on or after August 4, 2026

Aggregate market value 8,455,484.31 Market value associated with 180,557 common shares listed in the notice

Recent sale June 2, 2026 28,000 shares; 1,199,685.20 10b5-1 sale of common stock for Barbara J. Comly

Recent sale July 2, 2026 28,000 shares; 1,154,227.20 10b5-1 sale of common stock for Barbara J. Comly

Recent sale July 13, 2026 28,000 shares; 1,175,420.40 10b5-1 sale of common stock for Barbara J. Comly

Key Terms

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

3 terms

Rule 10b5-1 regulatory

"10b5-1 Sales for BARBARA J COMLY 7 Roszel Road"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

Exercise of Stock Options financial

"Common | 08/04/2026 | Exercise of Stock Options | Issuer"

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.

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

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Available on EDGAR 08/04/2026 - 04:33 PM Accepted by SEC EDGAR 08/04/2026 - 04:31 PM Learn about SEC filing dates

FAQ

What stock sale is disclosed for MIAX in this Form 144 filing?

The filing discloses an intent to sell 180,557 MIAX common shares on or after August 4, 2026 via the exercise of stock options for cash, as reported through Morgan Stanley Smith Barney LLC Executive Financial Services.

How many MIAX shares did Barbara J. Comly sell in the past three months?

Barbara J. Comly is reported as having sold 28,000 MIAX common shares on each of June 2, July 2, and July 13, 2026, for a total of 84,000 shares over that three‑month period.

What were the proceeds from Barbara J. Comly’s recent MIAX stock sales?

Reported gross proceeds were $1,199,685.20 on June 2, $1,154,227.20 on July 2, and $1,175,420.40 on July 13, 2026, from sales of 28,000 MIAX common shares on each date.

What is the planned transaction type for the 180,557 MIAX shares?

The 180,557 MIAX common shares are planned to be sold through an exercise of stock options for cash, with the intended transaction date listed as August 4, 2026 on the notice.

Is the MIAX stock sale associated with a Rule 10b5-1 trading plan?

The recent sales of 28,000 MIAX common shares on June 2, July 2, and July 13, 2026 are described as 10b5-1 sales for Barbara J. Comly, indicating they were executed under a pre‑arranged trading plan.

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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	180557	8455484.31	94907086	08/04/2026	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	08/04/2026	Exercise of Stock Options	Issuer			180557	08/04/2026	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	07/13/2026	28000	1175420.40
10b5-1 Sales for BARBARA J COMLY 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	07/02/2026	28000	1154227.20
10b5-1 Sales for BARBARA J COMLY 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	06/02/2026	28000	1199685.20

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)