MBX insider plans sale of 370 common shares

MBX filed to permit the sale of 370 shares of common stock, with an aggregate market value of $24,335.97, through Fidelity Brokerage Services LLC on NASDAQ on August 4, 2026.

Rhea-AI Filing Summary

MBX filed to permit the sale of 370 shares of common stock, with an aggregate market value of $24,335.97, through Fidelity Brokerage Services LLC on NASDAQ on August 4, 2026. These shares arose from restricted stock vesting on August 3, 2026 as compensation from the issuer. The filing also lists prior sales by Salomon Azoulay in the past three months, including 231 shares for $6,824.78 on May 6, 2026 and 70,003 shares for $2,685,680.90 on May 8, 2026.

Key Figures

Planned shares to be sold: 370 shares Aggregate market value of planned sale: $24,335.97 Shares acquired via restricted stock vesting: 370 shares +4 more

7 metrics

Planned shares to be sold 370 shares Common stock to be sold on or after August 4, 2026

Aggregate market value of planned sale $24,335.97 Estimated value for 370 common shares

Shares acquired via restricted stock vesting 370 shares Restricted Stock Vesting on August 3, 2026 classified as compensation

Shares sold on May 6, 2026 231 shares Common stock sale by Salomon Azoulay for $6,824.78

Proceeds from May 6, 2026 sale $6,824.78 Sale of 231 common shares

Shares sold on May 8, 2026 70,003 shares Common stock sale by Salomon Azoulay for $2,685,680.90

Proceeds from May 8, 2026 sale $2,685,680.90 Sale of 70,003 common shares

Key Terms

Form 144, Restricted Stock Vesting, Securities To Be Sold, Securities Sold During The Past 3 Months

4 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.

Restricted Stock Vesting financial

"Common | 08/03/2026 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

Securities To Be Sold regulatory

"144: Securities To Be Sold"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

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

What does MBX’s Form 144 filing disclose about upcoming stock sales?

The filing indicates a planned sale of 370 MBX common shares with an aggregate market value of $24,335.97, to be sold through Fidelity Brokerage Services LLC on NASDAQ on or after August 4, 2026.

How were the 370 MBX shares in the Form 144 acquired?

The 370 MBX shares covered by the Form 144 were acquired via Restricted Stock Vesting on August 3, 2026 from the issuer, and are classified in the filing as compensation rather than open-market purchases.

Who is the reporting person in MBX’s Form 144 filing?

The reporting person is Salomon Azoulay, listed with an address at 11711 N. Meridian Street, Suite 300, Carmel, Indiana 46032. The filing associates his name with both the planned sale and prior sales of MBX common stock.

What prior MBX stock sales are reported for the last three months?

The Form 144 lists two past MBX sales by Salomon Azoulay: 231 shares sold on May 6, 2026 for $6,824.78, and 70,003 shares sold on May 8, 2026 for $2,685,680.90.

Through which broker and market will the MBX shares be sold under this Form 144?

The 370 MBX common shares covered by the Form 144 are indicated for sale through Fidelity Brokerage Services LLC, with the trading market identified as NASDAQ and a proposed sale date of August 4, 2026.

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

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Available on EDGAR 08/04/2026 - 04:42 PM Accepted by SEC EDGAR 08/04/2026 - 04:42 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	370	24335.97	47597536	08/04/2026	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	08/03/2026	Restricted Stock Vesting	Issuer			370	08/03/2026	Compensation

* 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
Salomon Azoulay 11711 N. Meridian Street Suite 300 Carmel IN 46032	Common	05/08/2026	70003	2685680.90

144: Remarks and Signature

Remarks	Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.
Date of Notice	08/04/2026
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/ Louis Kurnick, 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)