Insider sale notice: 15,000 shares planned (MBX)

Rhea-AI Filing Summary

MBX insider sale notice: A Form 144 filing lists an intended sale of 15,000 shares of Common Stock on 05/13/2026 through Fidelity Brokerage Services LLC on NASDAQ. The excerpt also lists multiple recent dispositions by Richard B. Bartram totaling large block sales from 03/16/2026 through 05/11/2026.

Insights

Securities Counsel

Form 144 notifies the market of proposed Rule 144 sales by an affiliate.

Rule 144 filings provide notice of intended sales under resale conditions for restricted or affiliate-held securities. The filing lists 15,000 shares proposed for sale on 05/13/2026 via Fidelity Brokerage Services LLC and notes multiple recent dispositions by Richard B. Bartram.

Cash‑flow treatment and whether these are from previously registered shares or exercised options are specified in the excerpt as Cash and an Option Granted - 08/15/2023 origin; timing and final execution depend on transactional settlement and compliance with Rule 144 conditions.

Key Figures

Proposed sale: 15,000 shares Recent disposition: 22,500 shares Recent disposition: 10,000 shares +2 more

5 metrics

Proposed sale 15,000 shares to be sold on 05/13/2026 via Fidelity Brokerage Services LLC

Recent disposition 22,500 shares sold on 05/11/2026 by Richard B. Bartram for $991,901.00

Recent disposition 10,000 shares sold on 05/08/2026 by Richard B. Bartram for $379,562.50

Recent disposition 5,000 shares sold on 05/01/2026 by Richard B. Bartram for $159,000.00

Option grant date 08/15/2023 option granted date referenced as origin for securities to be sold

Key Terms

Form 144, Rule 144, Option Granted

3 terms

Form 144 regulatory

"Filer Information | 144: Filer Information"

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.

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.

Option Granted financial

"Option Granted - 08/15/2023"

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	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	15000	554295.75	47597536	05/13/2026	NASDAQ

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	05/13/2026	Option Granted - 08/15/2023	Issuer			15000	05/13/2026	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
Richard B. Bartram 11711 N. Meridian Street, Suite 300 Carmel IN 46032	Common	03/16/2026	10000	300471.00
Richard B. Bartram 11711 N. Meridian Street, Suite 300 Carmel IN 46032	Common	03/25/2026	1061	30217.49
Richard B. Bartram 11711 N. Meridian Street, Suite 300 Carmel IN 46032	Common	04/22/2026	10423	341377.72
Richard B. Bartram 11711 N. Meridian Street, Suite 300 Carmel IN 46032	Common	05/01/2026	5000	159000.00
Richard B. Bartram 11711 N. Meridian Street Suite 300 Carmel IN 46032	Common	05/07/2026	10000	322050.00
Richard B. Bartram 11711 N. Meridian Street Suite 300 Carmel IN 46032	Common	05/08/2026	10000	379562.50
Richard B. Bartram 11711 N. Meridian Street Suite 300 Carmel IN 46032	Common	05/11/2026	22500	991901.00

144: Remarks and Signature

Remarks

Date of Notice

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)

FAQ

What does MBX's Form 144 filing report?

The filing reports a proposed sale of 15,000 shares on 05/13/2026 through Fidelity Brokerage Services LLC on NASDAQ. It also lists prior open‑market dispositions by Richard B. Bartram from 03/16/2026 to 05/11/2026.

Who is the reported seller in the MBX excerpt?

The excerpt identifies Richard B. Bartram as the party associated with multiple recent sales and shows Fidelity Brokerage Services LLC as the broker for the proposed 15,000‑share sale on 05/13/2026.

Are the recent transactions by the insider detailed in the filing?

Yes. The excerpt lists several sales by Richard B. Bartram on specific dates with share counts and amounts, including 22,500 shares on 05/11/2026 and earlier trades dating back to 03/16/2026.

Does the Form 144 excerpt state how the securities were obtained?

The excerpt notes an Option Granted - 08/15/2023 as the origin for the securities to be sold and labels the consideration method as Cash, linking the proposed sale to prior option activity.