James M. Cornelius - 05 Jun 2025 Form 4 Insider Report for MBX Biosciences, Inc. (MBX)

Reporting relationship: Director
Issuer ticker: MBX
Reported as of: 05 Jun 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 06 Jun 2025, 08:04:19 UTC
Prior SEC filing: 17 Sep 2024
Source filing: View source filing
Reporting owner signature: /s/ Richard Bartram, attorney-in-fact

Key filing fact

James M. Cornelius filed Form 4 for MBX Biosciences, Inc. (MBX) on 06 Jun 2025.

Key facts

This page summarizes James M. Cornelius's Form 4 filing for MBX Biosciences, Inc. (MBX).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 06 Jun 2025, 08:04.

Change

Previous filing in this sequence was filed on 17 Sep 2024.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001198959 Primary reporting owner

CORNELIUS JAMES M

Relationship: Director
Address: C/O MBX BIOSCIENCES, INC., 11711 N. MERIDIAN STREET, SUITE 300, CARMEL
Signature: /s/ Richard Bartram, attorney-in-fact
Signature date: 06 Jun 2025

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MBX transaction Derivative

Stock option (right to buy)

Award

Transaction value: $0
Shares: +16,000
Change %
Price: $0.000000
Shares after: 16,000
Date: 05 Jun 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 16,000
Exercise price: $11.86
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The grant will vest in full on the earlier of the one-year anniversary of the grant date or on the date of our next annual meeting of stockholders, subject to the non-employee director's continued services to the Company.