SEC Form 4 · accession 0001366268-26-000004
Inhibrx Biosciences, Inc. · INBX
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Jon Faiz Kayyem
Director
Period of report
Sep 8, 2026
Accepted (ET)
Sep 8, 2026 · 5:23 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0002007919
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1,F2 | Sep 8, 2026 | P | 5,000 | $113.516 | A | 424,360 | I | By The Jon F. Kayyem and Paige Gates-Kayyem Family Trust |
| Common StockF3 | holding | — | — | — | 250,000 | I | By Jon Faiz Kayyem Revocable Trust | |
| Common StockF4 | holding | — | — | — | 250,000 | I | By Paige Gates-Kayyem Revocable Trust | |
| Common StockF5 | holding | — | — | — | 69,843 | I | By Child A | |
| Common StockF6 | holding | — | — | — | 69,843 | I | By Child B |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1The shares were purchased in multiple transactions at prices ranging from $113.30 to $113.55 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.
- F2These 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.
- F3These securities are directly owned by the Jon Faiz Kayyem Revocable Trust, of which Jon Faiz Kayyem is the trustee.
- F4These securities are directly owned by the Paige-Gates Kayyem Revocable Trust, of which Jon Faiz Kayyem's spouse is the trustee.
- F5These 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.
- F6These 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.