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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1776111	Mbx Biosciences Inc.	MBX	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1365617	J Patrick Heron	C/O Mbx Biosciences, Inc. 11711 N. Meridian Street, Suite 300 Carmel IN 46032		No	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2024-09-16	3,927,774	$0.00	3,927,774	No	4	C	Indirect	By Frazier Life Sciences X, L.P.
Common Stock	Acquisiton	2024-09-16	625,000	$16.00	4,552,774	No	4	P	Indirect	By Frazier Life Sciences X, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	By Frazier Life Sciences X, L.P.
No	4	P	Indirect	By Frazier Life Sciences X, L.P.

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A Convertible Preferred Stock	Disposition	2024-09-16	18,922,852	$0.00	1,574,005	$0.00
Common Stock	Series B Convertible Preferred Stock	Disposition	2024-09-16	28,297,265	$0.00	2,353,769	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect
0			No	4	C	Indirect

Footnotes

Each share of Series A Convertible Preferred Stock, Series B Convertible Preferred Stock and Series C Convertible Preferred Stock (collectively, the "Preferred Stock") was convertible into Common Stock on a one-for-12.0221 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on September 16, 2024. The Preferred Stock had no expiration date.
These securities are held of record by Frazier Life Sciences X, L.P. ("FLS X"). FHMLS X, L.P. is the general partner of FLS X, and FHMLS X, L.L.C. is the general partner of FHMLS X, L.P. The Reporting Person and James Topper, M.D., Ph.D., are the sole managing members of FHMLS X, L.L.C. and share voting and investment power of the securities held by FLS X, and as a result, may be deemed to have beneficial ownership over such securities. The Reporting Person and Dr. Topper disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.
Reflects shares purchased in the Issuer's initial public offering.