Key facts
- This page summarizes VIKING GLOBAL INVESTORS LP's Form 4 filing for Inhibrx Biosciences, Inc. (INBX).
- 3 reported transactions and 0 derivative rows are listed below.
- Accepted by SEC: 09 Oct 2025, 16:41.
VIKING GLOBAL INVESTORS LP - 07 Oct 2025 Form 4 Insider Report for Inhibrx Biosciences, Inc. (INBX)
- Reporting relationship
- 10%+ Owner
- Issuer ticker
- INBX
- Reported as of
- 07 Oct 2025
- Net transaction value
- -$11,287,500
- SEC form
- 4
- Accepted by SEC
- 09 Oct 2025, 16:41:40 UTC
- Prior SEC filing
- 01 Jul 2025
- Source filing
- View source filing
- Reporting owner signature
- /s/ Scott M. Hendler signing on behalf of O. Andreas Halvorsen (7)(8)
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
VIKING GLOBAL INVESTORS LP filed Form 4 for Inhibrx Biosciences, Inc. (INBX) on 09 Oct 2025.
Change
- Previous filing in this sequence was filed on 01 Jul 2025.
- Current net transaction value: -$11,287,500.
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 (8)
CIK 0001103804
Primary reporting owner
VIKING GLOBAL INVESTORS LP
- Relationship
- 10%+ Owner
- Address
- 600 WASHINGTON BLVD., FLOOR 11, STAMFORD
- Signature
- /s/ Scott M. Hendler signing on behalf of O. Andreas Halvorsen (7)(8)
- Signature date
- 09 Oct 2025
CIK 0001886738
Viking Global Opportunities Parent GP LLC
- Relationship
- 10%+ Owner
- Address
- 600 WASHINGTON BLVD., FLOOR 11, STAMFORD
- Signature
- /s/ Scott M. Hendler signing on behalf of David C. Ott (7)(8)
- Signature date
- 09 Oct 2025
CIK 0001629476
Viking Global Opportunities GP LLC
- Relationship
- 10%+ Owner
- Address
- 600 WASHINGTON BLVD., FLOOR 11, STAMFORD
- Signature
- /s/ Scott M. Hendler signing on behalf of Rose S. Shabet (7)(8)
- Signature date
- 09 Oct 2025
CIK 0001629472
Viking Global Opportunities Portfolio GP LLC
- Relationship
- 10%+ Owner
- Address
- 600 WASHINGTON BLVD., FLOOR 11, STAMFORD
- Signature
- /s/ Scott M. Hendler signing on behalf of O. Andreas Halvorsen (7)(8)
- Signature date
- 09 Oct 2025
CIK 0001629482
Viking Global Opportunities Illiquid Investments Sub-Master LP
- Relationship
- 10%+ Owner
- Address
- 600 WASHINGTON BLVD., FLOOR 11, STAMFORD
- Signature
- /s/ Scott M. Hendler signing on behalf of O. Andreas Halvorsen (7)(8)
- Signature date
- 09 Oct 2025
CIK 0001133006
HALVORSEN OLE ANDREAS
- Relationship
- 10%+ Owner
- Address
- 600 WASHINGTON BLVD., FLOOR 11, STAMFORD
- Signature
- /s/ Scott M. Hendler signing on behalf of O. Andreas Halvorsen (7)(8)
- Signature date
- 09 Oct 2025
CIK 0001621842
Ott David C.
- Relationship
- 10%+ Owner
- Address
- 600 WASHINGTON BLVD., FLOOR 11, STAMFORD
- Signature
- /s/ Scott M. Hendler signing on behalf of O. Andreas Halvorsen (7)(8)
- Signature date
- 09 Oct 2025
CIK 0001711393
Shabet Rose Sharon
- Relationship
- 10%+ Owner
- Address
- 600 WASHINGTON BLVD., FLOOR 11, STAMFORD
- Signature
- /s/ Scott M. Hendler signing on behalf of O. Andreas Halvorsen (7)(8)
- Signature date
- 09 Oct 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
INBX
transaction
Common Stock
Sale
- Transaction value
- $9,953,737
- Shares
- -308,643
- Change %
- -20%
- Price
- $32.25
- Shares after
- 1,267,823
- Date
- 07 Oct 2025
- Ownership
- See Explanation of Responses
- Footnotes
- F1, F2, F3, F6
INBX
transaction
Common Stock
Sale
- Transaction value
- $526,159
- Shares
- -16,315
- Change %
- -20%
- Price
- $32.25
- Shares after
- 67,018
- Date
- 07 Oct 2025
- Ownership
- See Explanation of Responses
- Footnotes
- F1, F2, F4, F6
INBX
transaction
Common Stock
Sale
- Transaction value
- $807,604
- Shares
- -25,042
- Change %
- -20%
- Price
- $32.25
- Shares after
- 102,864
- Date
- 07 Oct 2025
- Ownership
- See Explanation of Responses
- Footnotes
- F1, F2, F5, F6
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Section 16 status
VIKING GLOBAL INVESTORS LP is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.
Explanation of responses 6 footnotes
Footnote F1
Andreas Halvorsen, David C. Ott and Rose S. Shabet are Executive Committee members of certain management entities, including Viking Global Partners LLC, the general partner of Viking Global Investors LP ("VGI"), and Viking Global Opportunities Parent GP LLC ("Opportunities Parent"), the sole member of Viking Global Opportunities GP LLC ("Opportunities GP"), the sole member of Viking Global Opportunities Portfolio GP LLC ("Opportunities Portfolio GP"), the general partner of Viking Global Opportunities Illiquid Investments Sub-Master LP ("Opportunities Fund"). Opportunities Parent is also the sole member of Viking Global Opportunities Drawdown GP LLC ("VGOD GP"), the sole member of Viking Global Opportunities Drawdown Portfolio GP LLC ("VGOD Portfolio GP"), the general partner of Viking Global Opportunities Drawdown (Aggregator) LP ("VGOD").
Footnote F2
VGI provides managerial services to various investment funds and vehicles, including Opportunities Fund, VGOD, and KAVRA 104 LLC ("KAVRA 104"). VGI, Opportunities Parent, Opportunities GP, Opportunities Portfolio GP, Opportunities Fund, Mr. Halvorsen, Mr. Ott and Ms. Shabet are, collectively, the "Reporting Persons." Each of VGI, Mr. Halvorsen, Mr. Ott and Ms. Shabet may be deemed to beneficially own all of the securities reported on this form.
Footnote F3
These shares of Common Stock are held directly by Opportunities Fund. Because of the relationship between Opportunities Portfolio GP, Opportunities GP, Opportunities Parent and Opportunities Fund, each of Opportunities Portfolio GP, Opportunities GP and Opportunities Parent may be deemed to beneficially own the securities held directly by Opportunities Fund.
Footnote F4
These shares of Common Stock are held directly by KAVRA 104. The membership interests of KAVRA 104 are held by Viking Global Opportunities LP and Viking Global Opportunities Intermediate LP. Opportunities GP is the general partner of Viking Global Opportunities LP and Viking Global Opportunities Intermediate LP. Because of the relationship between Opportunities GP, Opportunities Parent and KAVRA 104, each of Opportunities GP and Opportunities Parent may be deemed to beneficially own the shares of Common Stock held directly by KAVRA 104.
Footnote F5
These shares of Common Stock are held directly by VGOD. Because of the relationship between Opportunities Parent and VGOD, Opportunities Parent may be deemed to beneficially own the shares of Common Stock held directly by VGOD.
Footnote F6
The Reporting Persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose.
SEC remarks
(7) The Reporting Persons are jointly filing this Form 4 pursuant to Rule 16a-3(j) under the Exchange Act. (8) Scott M. Hendler is signing on behalf of Mr. Halvorsen, Mr. Ott and Ms. Shabet, each individually and as an Executive Committee Member of VIKING GLOBAL PARTNERS LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as an Executive Committee Member of VIKING GLOBAL OPPORTUNITIES PARENT GP LLC, on behalf of itself and VIKING GLOBAL OPPORTUNITIES GP LLC, VIKING GLOBAL OPPORTUNITIES PORTFOLIO GP LLC and VIKING GLOBAL OPPORTUNITIES ILLIQUID INVESTMENTS SUB-MASTER LP, pursuant to authorization and designation letters dated February 9, 2021, which were filed with the Securities and Exchange Commission on June 7, 2021.