Vida Ventures GP III, L.L.C. - Sep 12, 2025 Form 4 Insider Report for LB PHARMACEUTICALS INC (LBRX)

Role
10%+ Owner
Signature
VIDA VENTURES GP III, L.L.C., By: /s/ Jean-Philippe Kouakou-Zebouah, its Managing Member
Stock symbol
LBRX
Transactions as of
Sep 12, 2025
Transactions value $
$4,999,995
Form type
4
Date filed
9/16/2025, 03:46 PM
Previous filing
Sep 10, 2025
SEC
View on sec.gov

Reporting Owners (5)

Name Relationship Address Signature Signature date CIK
Vida Ventures GP III, L.L.C. 10%+ Owner 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES VIDA VENTURES GP III, L.L.C., By: /s/ Jean-Philippe Kouakou-Zebouah, its Managing Member 2025-09-16 0001855502
Vida Ventures III, L.P. 10%+ Owner 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES VIDA VENTURES III, L.P., By: Vida Ventures GP III, L.L.C., its general partner, By: /s/ Jean-Philippe Kouakou-Zebouah, its Managing Member 2025-09-16 0001855504
Vida Ventures III-A, L.P. 10%+ Owner 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES VIDA VENTURES III-A, L.P., By: Vida Ventures GP III, L.L.C., its general partner, By: /s/ Jean-Philippe Kouakou-Zebouah, its Managing Member 2025-09-16 0001855503
Belldegrun Arie 10%+ Owner 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES VIDA VENTURES MANAGEMENT CO., LLC, By: /s/ Jean-Philippe Kouakou-Zebouah, its Managing Member 2025-09-16 0001296549
Vida Ventures Management Co. LLC 10%+ Owner 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES ARIE BELLDEGRUN By: /s/ Jean-Philippe Kouakou-Zebouah, his attorney-in-fact 2025-09-16 0001905615

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction LBRX Common Stock Conversion of derivative security +548K 548K Sep 12, 2025 By Vida Ventures III, L.P. F1, F2, F3
transaction LBRX Common Stock Conversion of derivative security +1.26K 1.26K Sep 12, 2025 By Vida Ventures III-A, L.P. F1, F4
transaction LBRX Common Stock Purchase $4.99M +333K +60.73% $15.00 880K Sep 12, 2025 By Vida Ventures III, L.P. F2, F3
transaction LBRX Common Stock Purchase $11.5K +767 +60.78% $15.00 2.03K Sep 12, 2025 By Vida Ventures III-A, L.P. F4
holding LBRX Common Stock 1.43K Sep 12, 2025 By Vida Ventures Management Co. LLC F5

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 LBRX Series C Preferred Stock Conversion of derivative security $0 -13.3M -100% $0.00 0 Sep 12, 2025 Common Stock 548K By Vida Ventures III, L.P. F1, F2, F3
transaction LBRX Series C Preferred Stock Conversion of derivative security $0 -30.7K -100% $0.00 0 Sep 12, 2025 Common Stock 1.26K By Vida Ventures III-A, L.P. F1, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Vida Ventures GP III, L.L.C. is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Explanation of Responses:

Id Content
F1 Each share of Series C Preferred Stock has no expiration date and converted automatically into Common Stock immediately prior to the Issuer's initial public offering at a conversion ratio based upon the initial price per share to the public in the Issuer's initial public offering.
F2 These shares are held directly by Vida Ventures III, L.P. ("Vida III"). Vida Ventures GP III, L.L.C. ("Vida III GP") is the general partner of Vida III and may be deemed to have voting, investment, and dispositive power with respect to these securities. Arie Belldegrun, Helen Kim and Rajul Jain, are the members of the investment committee of Vida III GP (each, an "Investment Committee Member" and such committee, the "Investment Committee").
F3 (Continued from Footnote 2) The Investment Committee and each of the Investment Committee Members may be deemed to share voting, investment and dispositive power with respect to these securities. Vida III GP, the Investment Committee and each of the Investment Committee Members disclaims beneficial ownership of the securities held of record by Vida III, and this report shall not be deemed an admission that they are the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interest therein, if any.
F4 These shares are held directly by Vida Ventures III-A, L.P. ("Vida III-A"). Vida III GP is the general partner of Vida III-A and may be deemed to have voting, investment, and dispositive power with respect to these securities. The Investment Committee and each of the Investment Committee Members may be deemed to share voting, investment and dispositive power with respect to these securities. Vida III GP, the Investment Committee and each of the Investment Committee Members disclaims beneficial ownership of the securities held of record by Vida III-A, and this report shall not be deemed an admission that they are the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interest therein, if any.
F5 These shares are held directly by Vida Ventures Management Co., LLC ("Vida Management"). Each Investment Committee Member (as defined below) disclaims beneficial ownership of the securities held of record by Vida Management, and this report shall not be deemed an admission that they are the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interest therein, if any.