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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
1237289	D Scott Sandell	1954 Greenspring Drive Suite 600 Timonium MD 21093		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	1,023,103	$0.00	1,023,103	No	4	C	Indirect	See Note 2
Common Stock	Acquisiton	2024-09-16	2,091,383	$0.00	3,114,486	No	4	C	Indirect	See Note 2
Common Stock	Acquisiton	2024-09-16	500,000	$16.00	3,614,486	No	4	P	Indirect	See Note 2

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Note 2
No	4	C	Indirect	See Note 2
No	4	P	Indirect	See Note 2

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	12,299,854	$0.00	1,023,103	$0.00
Common Stock	Series B Convertible Preferred Stock	Disposition	2024-09-16	25,142,840	$0.00	2,091,383	$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 and Series B 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.
The Reporting Person is a manager of NEA 17 GP, LLC, which is the sole general partner of NEA Partners 17, L.P. ("NEA Partners 17"). NEA Partners 17 is the sole general partner of New Enterprise Associates 17, L.P. ("NEA 17"), the direct beneficial owner of the securities. The Reporting Person disclaims beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the securities held by NEA 17 in which the Reporting Person has no pecuniary interest.