MBX Biosciences adopts amended charter and bylaws in connection with IPO

MBX Biosciences, Inc.

Fourth amended and restated certificate of incorporation filed; authorizes 500M shares of common stock.
Authorizes 10M shares of undesignated preferred stock with board authority to issue in series.
Eliminates all references to prior series of preferred stock from earlier charter.
Amended and restated bylaws establish advance notice procedures for stockholder proposals and director nominations.
Changes effective immediately prior to IPO consummation as previously disclosed in S-1.

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