Douglas G. Forsyth - 08 Sep 2026 Form 4 Insider Report for Inhibrx Biosciences, Inc. (INBX)

Reporting relationship: Director
Issuer ticker: INBX
Reported as of: 08 Sep 2026
Net transaction value: +$286,617
SEC form: 4
Accepted by SEC: 08 Sep 2026, 16:26:03 UTC
Prior SEC filing: 18 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Kelly D. Deck, as attorney-in-fact for Douglas G. Forsyth

Key filing fact

Douglas G. Forsyth filed Form 4 for Inhibrx Biosciences, Inc. (INBX) on 08 Sep 2026.

Key facts

This page summarizes Douglas G. Forsyth's Form 4 filing for Inhibrx Biosciences, Inc. (INBX).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 08 Sep 2026, 16:26.

Change

Previous filing in this sequence was filed on 18 Sep 2026.
Current net transaction value: +$286,617.

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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001240801 Primary reporting owner

FORSYTH DOUGLAS

Relationship: Director
Address: C/O INHIBRX BIOSCIENCES, INC., 11025 NORTH TORREY PINES ROAD, SUITE 140, LA JOLLA
Signature: /s/ Kelly D. Deck, as attorney-in-fact for Douglas G. Forsyth
Signature date: 08 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

INBX transaction

Common Stock

Purchase

Transaction value: $286,617
Shares: +2,500
Change %: +1.1%
Price: $114.65
Shares after: 227,064
Date: 08 Sep 2026
Ownership: By the Forsyth Family Trust Dated July 20, 2001
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

The shares were purchased in multiple transactions at prices ranging from $114.36 to $114.689 inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

Footnote F2

The reporting person is a trustee of the Forsyth Family Trust Dated July 20, 2001 and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Forsyth Family Trust Dated July 20, 2001.