According to recent filings covering the 90 days ending December 12, 2025, the three most significant insider holders at Inhibrx Biosciences are Director Jon Faiz Kayyem (419.36K shares), TenPercentOwner Global Investors Lp Viking (102.86K shares), Director Kristiina Md Vuori (20.44K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Inc. Inhibrx, | 1,157,926 | 31 May, 2024 | |
| Mark Lappe | Chief Executive Officer | 705,548 | 16 Sep, 2024 |
| Jon Faiz Kayyem | 419,360 | 28 Mar, 2025 | |
| Douglas Forsyth | 224,564 | 26 Aug, 2024 | |
| Global Investors Lp Viking | 102,864 | 09 Oct, 2025 | |
| Brendan P. Eckelman | Chief Scientific Officer | 40,000 | 30 May, 2024 |
| Kristiina Md Vuori | 20,443 | 07 Oct, 2024 | |
| Kimberly Manhard | 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 |
| 27 Mar, 2025 | Jon Faiz Kayyem | Common Stock | D | 90,000 | $0.00 | 419,360 | I | G |
| 27 Mar, 2025 | Jon Faiz Kayyem | - | - | 419,360 | I | |||
| 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 |
| 03 Oct, 2024 | Kristiina Md Vuori | - | - | 20,443 | D | |||
| 12 Sep, 2024 | Mark Lappe | Common Stock | A | 26,963 | $15.05 | 692,511 | I | P |
| 12 Sep, 2024 | Mark Lappe | - | - | 692,511 | I | |||
| 16 Sep, 2024 | Mark Lappe | Common Stock | A | 13,037 | $17.13 | 705,548 | I | P |
| 16 Sep, 2024 | Mark Lappe | - | - | 705,548 | I | |||
| 10 Sep, 2024 | Kristiina Md Vuori | Common Stock | A | 179 | $15.00 | 7,319 | D | P |