Key facts
- This page summarizes Vida Ventures GP III, L.L.C.'s Form 4 filing for LB PHARMACEUTICALS INC.
- 6 reported transactions and 2 derivative rows are listed below.
- Accepted by SEC: 16 Sep 2025, 15:46.
Vida Ventures GP III, L.L.C. - 12 Sep 2025 Form 4 Insider Report for LB PHARMACEUTICALS INC
- Reporting relationship
- 10%+ Owner
- Issuer ticker
- LBRX on Nasdaq
- Reported as of
- 12 Sep 2025
- Net transaction value
- +$4,999,995
- SEC form
- 4
- Accepted by SEC
- 16 Sep 2025, 15:46:23 UTC
- Prior SEC filing
- 10 Sep 2025
- Next SEC filing
- 04 Aug 2026
- Source filing
- View source filing
- Reporting owner signature
- VIDA VENTURES GP III, L.L.C., By: /s/ Jean-Philippe Kouakou-Zebouah, its Managing Member
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Vida Ventures GP III, L.L.C. filed Form 4 for LB PHARMACEUTICALS INC on 16 Sep 2025.
Change
- Previous filing in this sequence was filed on 10 Sep 2025.
- Current net transaction value: +$4,999,995.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (5)
CIK 0001855502
Primary reporting owner
Vida Ventures GP III, L.L.C.
- Relationship
- 10%+ Owner
- Address
- 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES
- Signature
- VIDA VENTURES GP III, L.L.C., By: /s/ Jean-Philippe Kouakou-Zebouah, its Managing Member
- Signature date
- 16 Sep 2025
CIK 0001855504
Vida Ventures III, L.P.
- Relationship
- 10%+ Owner
- Address
- 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES
- Signature
- 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
- Signature date
- 16 Sep 2025
CIK 0001855503
Vida Ventures III-A, L.P.
- Relationship
- 10%+ Owner
- Address
- 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES
- Signature
- 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
- Signature date
- 16 Sep 2025
CIK 0001296549
Belldegrun Arie
- Relationship
- 10%+ Owner
- Address
- 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES
- Signature
- VIDA VENTURES MANAGEMENT CO., LLC, By: /s/ Jean-Philippe Kouakou-Zebouah, its Managing Member
- Signature date
- 16 Sep 2025
CIK 0001905615
Vida Ventures Management Co. LLC
- Relationship
- 10%+ Owner
- Address
- 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES
- Signature
- ARIE BELLDEGRUN By: /s/ Jean-Philippe Kouakou-Zebouah, his attorney-in-fact
- Signature date
- 16 Sep 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
LBRX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +547,648
- Change %
- Price
- Shares after
- 547,648
- Date
- 12 Sep 2025
- Ownership
- By Vida Ventures III, L.P.
- Footnotes
- F1, F2, F3
LBRX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +1,262
- Change %
- Price
- Shares after
- 1,262
- Date
- 12 Sep 2025
- Ownership
- By Vida Ventures III-A, L.P.
- Footnotes
- F1, F4
LBRX
transaction
Common Stock
Purchase
- Transaction value
- $4,988,490
- Shares
- +332,566
- Change %
- +61%
- Price
- $15.00
- Shares after
- 880,214
- Date
- 12 Sep 2025
- Ownership
- By Vida Ventures III, L.P.
- Footnotes
- F2, F3
LBRX
transaction
Common Stock
Purchase
- Transaction value
- $11,505
- Shares
- +767
- Change %
- +61%
- Price
- $15.00
- Shares after
- 2,029
- Date
- 12 Sep 2025
- Ownership
- By Vida Ventures III-A, L.P.
- Footnotes
- F4
LBRX
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,434
- Date
- 12 Sep 2025
- Ownership
- By Vida Ventures Management Co. LLC
- Footnotes
- F5
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
LBRX
transaction
Derivative
Series C Preferred Stock
Conversion of derivative security
- Transaction value
- $0
- Shares
- -13,302,666
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 12 Sep 2025
- Ownership
- By Vida Ventures III, L.P.
- Underlying class
- Common Stock
- Underlying amount
- 547,648
- Exercise price
- Footnotes
- F1, F2, F3
LBRX
transaction
Derivative
Series C Preferred Stock
Conversion of derivative security
- Transaction value
- $0
- Shares
- -30,667
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 12 Sep 2025
- Ownership
- By Vida Ventures III-A, L.P.
- Underlying class
- Common Stock
- Underlying amount
- 1,262
- Exercise price
- Footnotes
- F1, F4
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Section 16 status
Vida Ventures GP III, L.L.C. is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.
Explanation of responses 5 footnotes
Footnote 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.
Footnote 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").
Footnote 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.
Footnote 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.
Footnote 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.