MBX files Rule 144 notice for 70,003 shares

MBX reported Rule 144 notice of proposed sales of Common Stock.

Rhea-AI Filing Summary

MBX reported Rule 144 notice of proposed sales of Common Stock. The filing lists two option-based lots designated for sale on 05/08/2026: 15,003 shares (option granted 09/12/2024) and 55,000 shares (option granted 08/02/2024), both noted as Cash Common. The filing also records a recent sale by Salomon Azoulay of 231 Common shares on 05/06/2026 for $6,824.78.

Insights

Securities Compliance Specialist

Rule 144 notice lists option-originated lots and a recent small open-market sale.

The filing catalogs proposed sales under Rule 144 for Common Stock dated 05/08/2026, showing two option-derived lots of 15,003 and 55,000 shares labeled Cash Common. It also discloses a completed sale of 231 shares on 05/06/2026 for $6,824.78.

These notices are administrative disclosures that permit compliance with resale conditions; timing, methods, and any transfer restrictions beyond the listed option grant dates are not detailed in the excerpt.

Key Figures

Proposed shares (lot 1): 15,003 shares Proposed shares (lot 2): 55,000 shares Recent sale reported: 231 shares +1 more

4 metrics

Proposed shares (lot 1) 15,003 shares scheduled sale on <date>05/08/2026</date>; option granted <date>09/12/2024</date>

Proposed shares (lot 2) 55,000 shares scheduled sale on <date>05/08/2026</date>; option granted <date>08/02/2024</date>

Recent sale reported 231 shares sold on <date>05/06/2026</date> by Salomon Azoulay

Proceeds from recent sale <money>$6,824.78</money> proceeds from the 231-share sale on <date>05/06/2026</date>

Key Terms

Rule 144, Option Granted, Cash Common

3 terms

Rule 144 regulatory

"Filing lists securities to be sold under Rule 144 notice"

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 - 09/12/2024 and Option Granted - 08/02/2024"

Cash Common financial

"Entries labeled 'Cash Common' for the scheduled sales"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does MBX's Form 144 show about shares for sale?

The Form 144 lists proposed sales of Common Stock scheduled for 05/08/2026. It specifies 15,003 shares (option granted 09/12/2024) and 55,000 shares (option granted 08/02/2024), both labeled as Cash Common.

Who recently sold MBX shares and how many?

The filing records a sale by Salomon Azoulay of 231 Common shares on 05/06/2026. The reported proceeds for that transaction are $6,824.78, as shown in the excerpt.

Do the Form 144 entries state how the shares will be sold?

The excerpt lists the proposed sale dates and labels the lots as Cash Common but does not detail specific sale methods or markets. The filing does not provide brokerage, block trade, or distribution method information in the provided text.

Are selling restrictions or post-sale holdings disclosed in this MBX filing?

The provided excerpt does not include post-transaction holdings or explicit transfer restrictions. It shows option grant dates and quantities but does not state remaining holdings or any holding-period qualifiers in the visible text.

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

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Accepted by SEC EDGAR 05/08/2026 - 04:10 PM Learn about SEC filing dates

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	0002030246
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MBX Biosciences, Inc.
SEC File Number	001-42272
Address of Issuer	11711 N. MERIDIAN STREET SUITE 300 CARMEL INDIANA 46032
Phone	3179893100
Name of Person for Whose Account the Securities are To Be Sold	Azoulay Salomon
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	Officer

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	70003	2685678.84	47597536	05/08/2026	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	05/08/2026	Option Granted - 09/12/2024	Issuer			15003	05/08/2026	Cash
Common	05/08/2026	Option Granted - 08/02/2024	Issuer			55000	05/08/2026	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
Salomon Azoulay 11711 N. Meridian Street Suite 300 Carmel IN 46032	Common	05/06/2026	231	6824.78

144: Remarks and Signature

Remarks
Date of Notice	05/08/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	01/27/2026
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	/s/ Emily Navaro, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Salomon Azoulay.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)