INBX insider buying – Inhibrx Biosciences, Inc.
18 insider purchases since 2016 worth $16.8M by 5 different insiders. Last 12 months: 6 purchases, $5.5M. Most recent filing: 2026-09-28.
Small company Public float $175M (latest 10-K, SEC). Share prices of small companies usually swing much more than those of large ones, in both directions, and are easier to move with little trading.
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| Kayyem Jon Faiz Director | $9.0M 6× · 466,521 sh | 2024-05-31 2026-09-23 | – | 1,074,046 shares as of 2026-09-23 | Holds - never sold |
| Lappe Mark CEO | $6.1M 6× · 199,000 sh | 2024-08-20 2026-09-25 | – | 960,413 shares as of 2026-09-28 | Holds - never sold |
| FORSYTH DOUGLAS Director | $1.3M 2× · 77,500 sh | 2024-08-22 2026-09-08 | – | 227,064 shares as of 2026-09-08 | Holds - never sold |
| Vuori Kristiina MD Director | $299,957 3× · 20,443 sh | 2024-08-29 2024-10-03 | – | 20,443 shares as of 2024-10-07 | Holds - never sold |
| MANHARD KIMBERLY Director | $139,800 1× · 10,000 sh | 2024-08-28 2024-08-28 | 2× · $279,015 last 2026-09-11 | 7,500 shares as of 2026-09-15 | Sold part |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2026 | 6 | $5.5M | 3 | 2 | $279,015 |
| 2025 | 0 | – | – | 1 | $11.3M |
| 2024 | 12 | $11.3M | 5 | – | – |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-28 | Lappe Mark | CEO | 10,000 | $99.88 | $998,793 | +1.4% | SEC |
| 2026-09-23 | Kayyem Jon Faiz | Director | 5,000 | $100.00 | $500,000 | +1.2% | SEC |
| 2026-09-17 | Kayyem Jon Faiz | Director | 5,000 | $100.00 | $500,000 | +1.2% | SEC |
| 2026-09-08 | Lappe Mark | CEO | 25,000 | $105.81 | $2.6M | +3.5% | SEC |
| 2026-09-08 | Kayyem Jon Faiz | Director | 5,000 | $113.52 | $567,600 | +1.2% | SEC |
| 2026-09-08 | FORSYTH DOUGLAS | Director | 2,500 | $114.65 | $286,625 | +1.1% | SEC |
| 2024-11-22 | Kayyem Jon Faiz | Director | 107,186 | $14.22 | $1.5M | SEC | |
| 2024-10-07 | Vuori Kristiina MD | Director | 6,667 | $15.00 | $100,005 | +48.4% | SEC |
| 2024-09-16 | Lappe Mark | CEO | 40,000 | $15.73 | $629,117 | +6.0% | SEC |
| 2024-09-12 | Vuori Kristiina MD | Director | 6,636 | $15.07 | $99,992 | +92.9% | SEC |
| 2024-09-10 | Lappe Mark | CEO | 44,000 | $15.25 | $671,150 | +7.1% | SEC |
| 2024-09-03 | Vuori Kristiina MD | Director | 7,140 | $14.00 | $99,960 | SEC | |
| 2024-09-03 | Lappe Mark | CEO | 40,000 | $14.92 | $596,763 | +32.0% | SEC |
| 2024-08-30 | MANHARD KIMBERLY | Director | 10,000 | $13.98 | $139,800 | SEC | |
| 2024-08-26 | FORSYTH DOUGLAS | Director | 75,000 | $13.83 | $1.0M | +50.1% | SEC |
| 2024-08-22 | Lappe Mark | CEO | 40,000 | $12.96 | $518,282 | +269.1% | SEC |
| 2024-06-07 | Kayyem Jon Faiz | Director | 57,549 | $17.32 | $997,024 | +5.3% | SEC |
| 2024-06-04 | Kayyem Jon Faiz | Director | 286,786 | $17.18 | $4.9M | +35.6% | SEC |
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-15 | MANHARD KIMBERLY | Director | 1,500 | $109.03 | $163,545 | Sale | SEC |
| 2026-09-10 | MANHARD KIMBERLY | Director | 1,000 | $115.47 | $115,470 | Sale | SEC |
| 2025-10-09 | Viking Global Opportunities Parent GP LLC | 10% Owner | 350,000 | $32.25 | $11.3M | Sale | SEC |
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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