JAMES M. CORNELIUS - 16 Sep 2024 Form 4 Insider Report for MBX Biosciences, Inc. (MBX)

Role: Director
Signature: /s/ Richard Bartram, attorney-in-fact
Issuer symbol: MBX
Transactions as of: 16 Sep 2024
Net transactions value: $0
Form type: 4
Filing time: 17 Sep 2024, 20:11:02 UTC
Previous filing: 12 Sep 2024
Next filing: 06 Jun 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MBX	Common Stock	Conversion of derivative security		+102,082			102,082	16 Sep 2024	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MBX	Series A Convertible Preferred Stock	Conversion of derivative security		-994,069	-100%		0	16 Sep 2024	Common Stock	82,686		Direct	F1
transaction	MBX	Series B Convertible Preferred Stock	Conversion of derivative security		-233,192	-100%		0	16 Sep 2024	Common Stock	19,396		Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each share of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, 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.

Content

Each share of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, 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.