Certain Stock Options of MBX Biosciences, Inc. are subject to a Lock-Up Agreement Ending on 9-DEC-2025. These Stock Options will be under lockup for 76 days starting from 24-SEP-2025 to 9-DEC-2025.

Details:
Directors and executive officers, and certain of significant shareholders, or such persons, the lock-up parties, have entered into lock-up agreements with the underwriters prior to the commencement of this offering pursuant to which each lock-up party, with limited exceptions, for a period of 75 days after the date of this prospectus or such period.