MIAX (MIAX) option exercise lists 20,000 shares; insider 10b5-1 June sales

Rhea-AI Filing Summary

MIAX: A Form 144 notice reports an exercise of stock options and planned sale of 20,000 shares of Common Stock. The filing also lists two completed 10b5-1 sales by Harish Jayabalan: 9,783 shares ($391,752.41) on 06/09/2026 and 10,217 shares ($409,930.56) on 06/08/2026.

Insights

Compliance Analyst

Routine Section 144 notice tied to an option exercise and scheduled resale.

The filing lists an exercise of stock options for 20,000 shares to be sold and records two recent 10b5-1 plan sales totaling 19,?+ shares across two dates in June 2026. The record shows cash proceeds for those prior sales.

This appears procedural: the notice documents planned resale mechanics and prior Rule 10b5-1 transactions. Subsequent filings may disclose whether the exercised shares were sold under the plan or held.

Key Figures

Planned sale: 20,000 shares 10b5-1 sale: 9,783 shares 10b5-1 sale: 10,217 shares +1 more

4 metrics

Planned sale 20,000 shares Exercise of stock options on 07/06/2026

10b5-1 sale 9,783 shares Sale on 06/09/2026 for $391,752.41

10b5-1 sale 10,217 shares Sale on 06/08/2026 for $409,930.56

Broker/Dealer Morgan Stanley Smith Barney LLC Filer/broker listed on Form 144

Key Terms

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

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

10b5-1 regulatory

"10b5-1 Sales for HARISH JAYABALAN"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"07/06/2026 | Exercise of Stock Options"

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

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Available on EDGAR 07/06/2026 - 04:33 PM Accepted by SEC EDGAR 07/06/2026 - 04:33 PM Learn about SEC filing dates

FAQ

What does the MIAX Form 144 disclose about the 20,000 shares?

The Form 144 discloses an exercise of stock options and planned sale of 20,000 shares of Common Stock. The notice ties the shares to an issuer-directed cash exercise recorded on 07/06/2026, per the filing excerpt.

Who executed recent 10b5-1 sales related to MIAX in June 2026?

The filing lists two Rule 10b5-1 sales attributed to Harish Jayabalan: 10,217 shares sold on 06/08/2026 for $409,930.56, and 9,783 shares on 06/09/2026 for $391,752.41.

Do the June 2026 10b5-1 sales match the 20,000-share planned sale?

The two completed 10b5-1 transactions total 20,000 shares (10,217 + 9,783) and cash proceeds shown. The Form 144 separately records a 20,000-share option exercise scheduled on 07/06/2026 in the excerpt.

Does the Form 144 state who will receive proceeds from the sale?

The excerpt indicates the exercise was processed for the issuer and lists prior sales as 10b5-1 transactions with cash amounts. The filing text ties the exercise to cash treatment; detailed proceeds allocation beyond that is not expanded in the excerpt.

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	20000	816800.00	94907086	07/06/2026	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	07/06/2026	Exercise of Stock Options	Issuer			20000	07/06/2026	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 HARISH JAYABALAN 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	06/09/2026	9783	391752.41
10b5-1 Sales for HARISH JAYABALAN 7 Roszel Road, Suite 1A Princeton NJ 08540	Common	06/08/2026	10217	409930.56

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)