Inhibrx Biosciences, Inc.
AI summary Insiders, including CEO Mark Lappe and Directors, make substantial open-market purchases following positive phase 2 clinical data for INBRX-106.
- Research score
- 64
- AI adjustment
- +9
Research score, not a recommendation.
Market data
Live quote and chart from Yahoo Finance, loaded through this server. Insider purchases are marked on the chart.
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Why this score
Research score: a weighted blend of the five factors, times the routine and offering discounts, minus the selling penalty.
Why are they buying?
AI · discretionary · catalyst credible · documentedThe insider buying cluster occurred immediately following a major clinical readout on September 8, 2026, which reported strong progression-free survival and response rate data for the company's OX40 agonist INBRX-106 in head and neck cancer.
CEO Mark Lappe and multiple directors purchased millions of dollars worth of common stock through family trusts across several dates in September 2026.
Filing references and sources
Stock Price & Insider Purchase History
Daily close price with open-market insider purchases plotted over time
Loading price history…
| Date | Insider | Role | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|
| 2026-09-08 → 2026-10-14 | Lappe Mark 4 purchases with a 63-day result · median -15.5% | CEO | 44,940 | $99.79 avg | $4.5M | |
| 2026-09-08 | Lappe Mark | 9,681 | $112.28 | $1.1M | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-08 | Lappe Mark | 1,219 | $111.88 | $136.4K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-08 | Lappe Mark | 500 | $108.23 | $54.1K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-08 | Lappe Mark | 1,100 | $107.12 | $117.8K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-08 | Lappe Mark | 6,605 | $100.64 | $664.7K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-08 | Lappe Mark | 5,895 | $99.29 | $585.3K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-25 | Lappe Mark | 2,176 | $99.60 | $216.7K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-25 | Lappe Mark | 3,324 | $98.87 | $328.6K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-28 | Lappe Mark | 3,000 | $101.70 | $305.1K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-28 | Lappe Mark | 1,500 | $98.88 | $148.3K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-10-14 | Lappe Mark | 100 | $85.76 | $8.6K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-10-14 | Lappe Mark | 2,451 | $85.00 | $208.3K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-10-14 | Lappe Mark | 2,449 | $84.07 | $205.9K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-10-14 | Lappe Mark | 2,470 | $85.00 | $209.9K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-10-14 | Lappe Mark | 2,470 | $84.07 | $207.7K | SEC filing for Lappe Mark (opens in a new tab) | |
| 2026-09-08 → 2026-09-23 | Kayyem Jon Faiz 3 purchases with a 63-day result · median -15.4% | Director | 15,000 | $104.51 avg | $1.6M | |
| 2026-09-08 | Kayyem Jon Faiz | 5,000 | $113.52 | $567.6K | SEC filing for Kayyem Jon Faiz (opens in a new tab) | |
| 2026-09-16 | Kayyem Jon Faiz | 5,000 | $100.00 | $500.0K | SEC filing for Kayyem Jon Faiz (opens in a new tab) | |
| 2026-09-23 | Kayyem Jon Faiz | 5,000 | $100.00 | $500.0K | SEC filing for Kayyem Jon Faiz (opens in a new tab) | |
| 2026-09-08 | FORSYTH DOUGLAS history of FORSYTH DOUGLAS's purchases | Director | 2,500 | $114.65 | $286.6K | SEC filing for FORSYTH DOUGLAS (opens in a new tab) |
| Total | $6.3M | |||||
Other buying runs at INBX
A run ends after a pause in the buying, so one company can have several. Returns are the stock's return minus its benchmark's (IWM for small companies, SPY otherwise), from the first open after the run became a cluster. Past results, not a forecast.
After this run became a cluster: 21 days -15.8%63 days –126 days –
| Window | Insiders | Total | Score | 21 days | 63 days | 126 days | Status |
|---|---|---|---|---|---|---|---|
| 2024-08-20 → 2024-10-03 | 4 | $3.9M | 74 | +5.0% | -8.3% | -3.8% | closed |