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ACCESSION NUMBER:		0001193125-25-211320
CONFORMED SUBMISSION TYPE:	S-1
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FILED AS OF DATE:		20250922
DATE AS OF CHANGE:		20250922

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MBX Biosciences, Inc.
		CENTRAL INDEX KEY:			0001776111
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-1
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-290447
		FILM NUMBER:		251330153

	BUSINESS ADDRESS:	
		STREET 1:		11711 N. MERIDIAN STREET
		STREET 2:		SUITE 300
		CITY:			CARMEL
		STATE:			IN
		ZIP:			46032
		BUSINESS PHONE:		3179893100

	MAIL ADDRESS:	
		STREET 1:		11711 N. MERIDIAN STREET
		STREET 2:		SUITE 300
		CITY:			CARMEL
		STATE:			IN
		ZIP:			46032
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