Inhibrx Biosciences's three largest insider shareholders as of April 17, 2026 are Inc. Inhibrx, (TenPercentOwner, 1.16Mn shares), Mark Lappe (Chief Executive Officer, 705.55K shares), Jon Faiz Kayyem (Director, 500.00K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Inc. Inhibrx, | - | 1,157,926 | 0 | 31 May, 2024 |
| Mark Lappe | Chief Executive Officer | 0 | 705,548 | 16 Sep, 2024 |
| Jon Faiz Kayyem | - | 0 | 500,000 | 17 Dec, 2024 |
| Brendan P. Eckelman | Chief Scientific Officer | 0 | 473,888 | 30 May, 2024 |
| Jon Faiz Kayyem | - | 0 | 419,360 | 28 Mar, 2025 |
| Douglas Forsyth | - | 0 | 224,564 | 26 Aug, 2024 |
| Mark Lappe | Chief Executive Officer | 0 | 165,000 | 03 Sep, 2024 |
| Jon Faiz Kayyem | - | 0 | 139,686 | 22 Nov, 2024 |
| Mark Lappe | Chief Executive Officer | 0 | 125,000 | 30 May, 2024 |
| Global Investors Lp Viking | - | 0 | 102,864 | 09 Oct, 2025 |
| Global Investors Lp Viking | - | 0 | 102,864 | 09 Oct, 2025 |
| Mark Lappe | Chief Executive Officer | 0 | 54,865 | 22 Aug, 2024 |
| Kristiina Md Vuori | - | 20,443 | 0 | 07 Oct, 2024 |
| Kimberly Manhard | - | 0 | 10,000 | 30 Aug, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 07 Oct, 2025 | Global Investors Lp Viking | Common Stock | D | 308,643 | $32.25 | 1,267,823 | I | S |
| 07 Oct, 2025 | Global Investors Lp Viking | Common Stock | D | 16,315 | $32.25 | 67,018 | I | S |
| 07 Oct, 2025 | Global Investors Lp Viking | Common Stock | D | 25,042 | $32.25 | 102,864 | I | S |
| 28 May, 2025 | Kimberly Manhard | Stock Option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 28 May, 2025 | Douglas Forsyth | Stock Option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 28 May, 2025 | Kristiina Md Vuori | Stock Option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 28 May, 2025 | Jon Faiz Kayyem | Stock Option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 01 Apr, 2025 | Kelly Deck | Stock Option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 01 Apr, 2025 | David Matly | Stock Option (right to buy) | A | 50,000 | $0.00 | 50,000 | D | A |
| 27 Mar, 2025 | Jon Faiz Kayyem | Common Stock | D | 90,000 | $0.00 | 419,360 | I | G |
| 16 Dec, 2024 | Jon Faiz Kayyem | Common Stock | D | 500,000 | $0.00 | 509,360 | I | G |
| 16 Dec, 2024 | Jon Faiz Kayyem | Common Stock | A | 250,000 | $0.00 | 250,000 | I | G |
| 16 Dec, 2024 | Jon Faiz Kayyem | Common Stock | A | 250,000 | $0.00 | 250,000 | I | G |
| 06 Dec, 2024 | Jon Faiz Kayyem | Common Stock | D | 52,000 | $0.00 | 1,009,360 | I | G |
| 19 Nov, 2024 | Jon Faiz Kayyem | Common Stock | A | 34,843 | $14.23 | 51,093 | I | P |
| 19 Nov, 2024 | Jon Faiz Kayyem | Common Stock | A | 34,843 | $14.23 | 51,093 | I | P |
| 20 Nov, 2024 | Jon Faiz Kayyem | Common Stock | A | 18,750 | $14.19 | 69,843 | I | P |
| 20 Nov, 2024 | Jon Faiz Kayyem | Common Stock | A | 18,750 | $14.19 | 69,843 | I | P |
| 03 Oct, 2024 | Kristiina Md Vuori | Common Stock | A | 6,667 | $15.00 | 20,443 | D | P |
| 12 Sep, 2024 | Mark Lappe | Common Stock | A | 26,963 | $15.05 | 692,511 | I | P |