Proposed sale of 10,423 MBX shares (NASDAQ: MBX) reported

Rhea-AI Filing Summary

MBX reports proposed and recent insider sales of Common Stock via Form 144.

The filing lists 10,423 shares tied to a broker account on 04/22/2026 and notes recent dispositions: 10,000 shares sold on 03/16/2026 for $300,471.00 and 1,061 shares sold on 03/25/2026 for $30,217.49. Several option-originated lots with grant dates are shown for the 04/22/2026 sale.

Insights

Securities Compliance Analyst

Form 144 lists proposed resale of 10,423 MBX common shares and shows two recent March sales.

The filing records a brokered selling record for 10,423 shares dated 04/22/2026 and identifies option-originated lots with grant dates 04/20/2022, 11/07/2022, and 08/15/2023. Two prior dispositions by Richard B. Bartram are itemized: 10,000 shares on 03/16/2026 and 1,061 shares on 03/25/2026, with transaction proceeds shown.

Filing-level implications are administrative: Form 144 notifies broker/SEC of intended sales and documents past small dispositions. Cash‑flow treatment and whether sales are under a trading plan are not stated in the excerpt; subsequent filings or broker confirmations would show execution details.

Key Figures

Proposed shares tied to broker: 10,423 shares Value associated with broker entry: $341,377.75 Sale on 03/16/2026: 10,000 shares +6 more

9 metrics

Proposed shares tied to broker 10,423 shares Listed with Fidelity Brokerage entry dated 04/22/2026

Value associated with broker entry $341,377.75 Amount shown alongside the 10,423-share broker line (04/22/2026)

Sale on 03/16/2026 10,000 shares Sold by Richard B. Bartram for $300,471.00

Proceeds on 03/16/2026 $300,471.00 Proceeds reported for the 10,000-share sale

Sale on 03/25/2026 1,061 shares Sold by Richard B. Bartram for $30,217.49

Proceeds on 03/25/2026 $30,217.49 Proceeds reported for the 1,061-share sale

Option-originated lot (A) 2,805 shares Listed as 'Option Granted 04/20/2022' tied to 04/22/2026 sale

Option-originated lot (B) 2,806 shares Listed as 'Option Granted 11/07/2022' tied to 04/22/2026 sale

Option-originated lot (C) 4,812 shares Listed as 'Option Granted 08/15/2023' tied to 04/22/2026 sale

Key Terms

Form 144, Option Granted, Cash, Fidelity Brokerage Services LLC

4 terms

Form 144 regulatory

"Form 144 reporting proposed sale of securities (first line)"

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.

Option Granted financial

"Entries show 'Option Granted 04/20/2022' near securities to be sold"

Cash financial

"Lines list 'Cash' as treatment for the 04/22/2026 sale entries"

Fidelity Brokerage Services LLC other

"Broker listed as 'Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI'"

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	10423	341377.75	47510243	04/22/2026	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	04/22/2026	Option Granted 04/20/2022	Issuer			2805	04/22/2026	Cash
Common	04/22/2026	Option Granted 11/07/2022	Issuer			2806	04/22/2026	Cash
Common	04/22/2026	Option Granted 08/15/2023	Issuer			4812	04/22/2026	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

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 report about proposed share sales?

It reports a proposed resale of 10,423 shares of Common Stock tied to a broker account dated 04/22/2026. The filing lists option-originated lots with specific grant dates related to that proposed sale.

Who reported recent MBX share sales and how many shares were sold?

Richard B. Bartram reported two sales: 10,000 shares on 03/16/2026 for $300,471.00 and 1,061 shares on 03/25/2026 for $30,217.49, as shown in the filing excerpt.

Are the shares tied to options or grants in the MBX Form 144?

Yes; the excerpt lists securities to be sold with annotations showing Option Granted dates of 04/20/2022, 11/07/2022, and 08/15/2023, indicating the lots originated from option grants.

Does the Form 144 show how the proceeds will be used?

No; the excerpt provides transaction proceeds for past sales but does not state any use of proceeds or specify who receives cash for the proposed 04/22/2026 resale.

Which broker or account is associated with the proposed MBX sale?

The filing lists Fidelity Brokerage Services LLC, 900 Salem Street, Smithfield RI and ties 10,423 shares to that broker entry dated 04/22/2026 in the excerpt.