X0609 4 2026-09-23 0 0002007919 Inhibrx Biosciences, Inc. INBX 0001366268 Kayyem Jon Faiz false C/O INHIBRX BIOSCIENCES, INC. 11025 NORTH TORREY PINES ROAD, SUITE 140 LA JOLLA CA 92037 1 0 0 0 0 Common Stock 2026-09-23 4 P 0 5000 100 A 434360 I By The Jon F. Kayyem and Paige Gates-Kayyem Family Trust Common Stock 250000 I By Jon Faiz Kayyem Revocable Trust Common Stock 250000 I By Paige Gates-Kayyem Revocable Trust Common Stock 69843 I By Child A Common Stock 69843 I By Child B These securities are directly owned by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust. Jon Faiz Kayyem is the trustee of The Jon Faiz Kayyem and Paige N. Gates Family Trust and he disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein. These securities are directly owned by the Jon Faiz Kayyem Revocable Trust, of which Jon Faiz Kayyem is the trustee. These securities are directly owned by the Paige-Gates Kayyem Revocable Trust, of which Jon Faiz Kayyem's spouse is the trustee. These securities are directly owned by a custodial account managed by the reporting person for the benefit of the reporting person's minor child, Child A. The reporting person disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein. These securities are directly owned by a custodial account managed by the reporting person for the benefit of the reporting person's minor child, Child B. The reporting person disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein. /s/ Kelly Deck, as attorney-in-fact to Jon Faiz Kayyem 2026-09-23