As of August 29, 2026, the three largest insider holders of INBX are Inc. Inhibrx, (TenPercentOwner, 1.16Mn shares), Inc. Inhibrx, (TenPercentOwner, 1.16Mn shares), Mark Lappe (Chief Executive Officer, 925.41K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Inc. Inhibrx, | TenPercentOwner | 1,157,926 | 0 | 1,157,926 | 34.7% | 31 May, 2024 |
| 2 | Mark Lappe | Chief Executive Officer | 0 | 925,413 | 925,413 | 27.8% | 16 Sep, 2024 |
| 3 | Brendan P. Eckelman | Chief Scientific Officer | 0 | 473,888 | 473,888 | 14.2% | 30 May, 2024 |
| 4 | Jon Faiz Kayyem | Director | 0 | 419,360 | 419,360 | 12.6% | 28 Mar, 2025 |
| 5 | Douglas Forsyth | Director | 0 | 224,564 | 224,564 | 6.7% | 26 Aug, 2024 |
| 6 | Global Investors Lp Viking | TenPercentOwner | 0 | 102,864 | 102,864 | 3.1% | 09 Oct, 2025 |
| 7 | Kristiina Md Vuori | Director | 20,443 | 0 | 20,443 | 0.6% | 07 Oct, 2024 |
| 8 | Kimberly Manhard | Director | 0 | 10,000 | 10,000 | 0.3% | 30 Aug, 2024 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 03 Jun, 2026 | Kimberly Manhard | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 03 Jun, 2026 | Kristiina Md Vuori | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 03 Jun, 2026 | Jon Faiz Kayyem | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 03 Jun, 2026 | Douglas Forsyth | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 24 Apr, 2026 | David Matly | President | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 07 Oct, 2025 | Global Investors Lp Viking | TenPercentOwner | Disposed S | 308,643 | $32.25 | $9.95Mn | 1,267,823 | Indirect |
| 07 Oct, 2025 | Global Investors Lp Viking | TenPercentOwner | Disposed S | 308,643 | $32.25 | $9.95Mn | 1,267,823 | Indirect |
| 07 Oct, 2025 | Global Investors Lp Viking | TenPercentOwner | Disposed S | 16,315 | $32.25 | $526.16K | 67,018 | Indirect |
| 07 Oct, 2025 | Global Investors Lp Viking | TenPercentOwner | Disposed S | 16,315 | $32.25 | $526.16K | 67,018 | Indirect |
| 07 Oct, 2025 | Global Investors Lp Viking | TenPercentOwner | Disposed S | 25,042 | $32.25 | $807.60K | 102,864 | Indirect |
| 07 Oct, 2025 | Global Investors Lp Viking | TenPercentOwner | Disposed S | 25,042 | $32.25 | $807.60K | 102,864 | Indirect |
| 28 May, 2025 | Kimberly Manhard | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 28 May, 2025 | Kimberly Manhard | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 28 May, 2025 | Douglas Forsyth | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 28 May, 2025 | Kimberly Manhard | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 28 May, 2025 | Jon Faiz Kayyem | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 28 May, 2025 | Jon Faiz Kayyem | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 28 May, 2025 | Kimberly Manhard | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 28 May, 2025 | Jon Faiz Kayyem | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 28 May, 2025 | Jon Faiz Kayyem | Director | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |