Form 4 for INBX Inhibrx Biosciences, Inc.
Accepted 2026-09-08 16:04:45 ET · period of report 2026-09-08 · accession 0001366074-26-000002 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MI | 2026-09-08 16:04 | 2026-09-08 | INBX | Lappe Mark | CEO, Dir | P - Purchase | $105.82 | +25.0K | 730.5K | +4% | +$2.65M |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-09-08 | P | A | 5,895 | $99.29 | 711,443 | I By the Lappe Family Trust | — | — | (F1) The shares were purchased in multiple transactions at prices ranging from $98.88 to $99.8316 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. (F2) These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust. |
| 2 | Common | Common Stock | 2026-09-08 | P | A | 6,605 | $100.64 | 718,048 | I By the Lappe Family Trust | — | — | (F3) The shares were purchased in multiple transactions at prices ranging from $100.095 to $100.99 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. (F2) These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust. |
| 3 | Common | Common Stock | 2026-09-08 | P | A | 1,100 | $107.12 | 719,148 | I By the Lappe Family Trust | — | — | (F4) The shares were purchased in multiple transactions at prices ranging from $106.6225 to $107.57 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. (F2) These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust. |
| 4 | Common | Common Stock | 2026-09-08 | P | A | 500 | $108.23 | 719,648 | I By the Lappe Family Trust | — | — | (F5) The shares were purchased in multiple transactions at prices ranging from $108.05 to $108.66 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. (F2) These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust. |
| 5 | Common | Common Stock | 2026-09-08 | P | A | 1,219 | $111.88 | 720,867 | I By the Lappe Family Trust | — | — | (F6) The shares were purchased in multiple transactions at prices ranging from $111.15 to $112.07 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. (F2) These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust. |
| 6 | Common | Common Stock | 2026-09-08 | P | A | 9,681 | $112.28 | 730,548 | I By the Lappe Family Trust | — | — | (F7) The shares were purchased in multiple transactions at prices ranging from $112.15 to $112.44 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. (F2) These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust. |