MBX Biosciences officer plans $20.1K share sale

The notice ties the shares to restricted-stock vesting and says the sale includes an amount to cover a tax obligation from the award distribution.

Available on EDGAR 11/04/2026 - 03:12 PM EST Accepted by SEC EDGAR 11/04/2026 - 03:12 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

MBX Biosciences, Inc. officer Salomon Azoulay reported a planned sale of 373 common shares through Fidelity Brokerage Services LLC, with an aggregate market value of $20,126.78 and an approximate sale date of November 4, 2026. The shares came from restricted stock vesting on November 2, 2026; the notice says the sale includes an amount necessary to cover a tax obligation from settlement of a vested equity award. Azoulay reported selling 370 common shares for $24,335.97 on August 4, 2026.

Key Figures

Common shares to be sold: 373 shares Aggregate market value: $20,126.78 Shares outstanding: 48,160,096 shares +2 more

5 metrics

Common shares to be sold 373 shares Planned sale reported by Salomon Azoulay

Aggregate market value $20,126.78 Planned sale of 373 common shares

Shares outstanding 48,160,096 shares Issuer share count listed in the notice

Prior common shares sold 370 shares Salomon Azoulay reported a sale on August 4, 2026

Prior sale aggregate market value $24,335.97 Salomon Azoulay's reported sale on August 4, 2026

Key Terms

Restricted Stock Vesting, vested equity award distribution, Rule 144

3 terms

Restricted Stock Vesting financial

"Restricted Stock Vesting"

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.

vested equity award distribution financial

"settlement of a vested equity award distribution"

Rule 144 regulatory

"paragraph (a) of Rule 144"

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.

FAQ

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How many MBX shares did Salomon Azoulay plan to sell?

Salomon Azoulay, an officer of MBX Biosciences, reported a planned sale of 373 common shares with an aggregate market value of $20,126.78, at an approximate sale date of November 4, 2026, through Fidelity Brokerage Services LLC.

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

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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	373	20126.78	48160096	11/04/2026	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	11/02/2026	Restricted Stock Vesting	Issuer			373	11/02/2026	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	08/04/2026	370	24335.97

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	11/04/2026
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/ Jennifer Ruchti, 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)