Inhibrx Biosciences's top three insider shareholders as of March 23, 2026 are Inc. Inhibrx, (TenPercentOwner, 1.16Mn shares), Mark Lappe (Chief Executive Officer, 705.55K shares), Jon Faiz Kayyem (Director, 419.36K 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 | 419,360 | 28 Mar, 2025 | |
| Brendan P. Eckelman | Chief Scientific Officer | 0 | 40,000 | 30 May, 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 |
|---|---|---|---|---|---|---|---|---|
| 28 May, 2025 | Kristiina Md Vuori | Stock Option (right to buy) | A | 15,000 | $0.00 | 15,000 | D | A |
| 28 May, 2025 | Kimberly Manhard | 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 | David Matly | Stock Option (right to buy) | A | 50,000 | $0.00 | 50,000 | D | A |
| 01 Apr, 2025 | Kelly Deck | Stock Option (right to buy) | A | 15,000 | $0.00 | 15,000 | 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 |
| 16 Sep, 2024 | Mark Lappe | Common Stock | A | 13,037 | $17.13 | 705,548 | I | P |
| 10 Sep, 2024 | Kristiina Md Vuori | Common Stock | A | 179 | $15.00 | 7,319 | D | P |
| 11 Sep, 2024 | Kristiina Md Vuori | Common Stock | A | 6,457 | $15.07 | 13,776 | D | P |
| 06 Sep, 2024 | Mark Lappe | Common Stock | A | 26,000 | $15.29 | 647,548 | I | P |