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Inhibrx Biosciences, Inc. (NASDAQ:INBX)
US · Delayed Price · Currency is USD
Healthcare · Biotechnology
88.61-4.77 (-5.11%)
Market cap
$1.30B
Insider Score
Health Score
Analyst consensus
Listed since
May 29, 2024
Website
Insider Score
/ 100
INBX Insider Score
Inhibrx Biosciences, Inc. has a live Insider Score.
Scored on 20 qualifying trades from 3 insiders in the last 90 days.
INBX Stock Insider Trading Activity
INBX stock’s insider trading shows 20 purchases for an estimated $6.35M and 5 sales on the open market for an estimated $279.01K by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days20 qualifying buys3 insiders$6.35M bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Lappe Mark CEO | Buy | 100 | $85.76 | $8.58K | 0.0% | 745,588 | Oct 14, 2026 | DCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 2,470 | $84.07 | $207.65K | 0.3% | 743,018 | Oct 14, 2026 | CCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 2,449 | $84.07 | $205.89K | 1.5% | 167,449 | Oct 14, 2026 | CCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 2,470 | $85.00 | $209.95K | 0.3% | 745,488 | Oct 14, 2026 | CCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 100 | $85.76 | $8.58K | 0.1% | 170,000 | Oct 14, 2026 | DCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 2,451 | $85.00 | $208.33K | 1.5% | 169,900 | Oct 14, 2026 | CCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 1,500 | $98.88 | $148.32K | 0.2% | 737,548 | Sep 28, 2026 | CCluster BuyCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 3,000 | $101.70 | $305.11K | 0.4% | 740,548 | Sep 28, 2026 | CCluster BuyCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 3,324 | $98.87 | $328.63K | 0.5% | 733,872 | Sep 25, 2026 | CCluster BuyCEO Buy | Form 4 |
| Lappe Mark CEO | Buy | 2,176 | $99.60 | $216.73K | 0.3% | 736,048 | Sep 25, 2026 | CCluster BuyCEO Buy | Form 4 |
| Kayyem Jon Faiz Director | Buy | 5,000 | $100.00 | $500.00K | 1.2% | 434,360 | Sep 23, 2026 | CCluster Buy | Form 4 |
| Kayyem Jon Faiz Director | Buy | 5,000 | $100.00 | $500.00K | 1.2% | 429,360 | Sep 16, 2026 | CCluster Buy | Form 4 |
| MANHARD KIMBERLY Director | Sell | 500 | $105.05 | $52.52K | 6.3% | 7,500 | Sep 15, 2026 | — | Form 4 |
| MANHARD KIMBERLY Director | Sell | 500 | $110.26 | $55.13K | 5.9% | 8,000 | Sep 14, 2026 | — | Form 4 |
| MANHARD KIMBERLY Director | Sell | 500 | $111.78 | $55.89K | 5.6% | 8,500 | Sep 11, 2026 | — | Form 4 |
| MANHARD KIMBERLY Director | Sell | 500 | $115.80 | $57.90K | 5.3% | 9,000 | Sep 9, 2026 | — | Form 4 |
| MANHARD KIMBERLY Director | Sell | 500 | $115.14 | $57.57K | 5.0% | 9,500 | Sep 8, 2026 | — | Form 4 |
| FORSYTH DOUGLAS Director | Buy | 2,500 | $114.65 | $286.62K | 1.1% | 227,064 | Sep 8, 2026 | CCluster BuyFirst Buy | Form 4 |
| Lappe Mark CEO | Buy | 9,681 | $112.28 | $1.09M | 1.3% | 730,548 | Sep 8, 2026 | ACluster BuyFirst Buy | Form 4 |
| Lappe Mark CEO | Buy | 1,219 | $111.88 | $136.38K | 0.2% | 720,867 | Sep 8, 2026 | BCluster BuyFirst Buy | Form 4 |
| Lappe Mark CEO | Buy | 500 | $108.23 | $54.12K | 0.1% | 719,648 | Sep 8, 2026 | BCluster BuyFirst Buy | Form 4 |
| Lappe Mark CEO | Buy | 1,100 | $107.12 | $117.84K | 0.2% | 719,148 | Sep 8, 2026 | BCluster BuyFirst Buy | Form 4 |
| Lappe Mark CEO | Buy | 6,605 | $100.64 | $664.72K | 0.9% | 718,048 | Sep 8, 2026 | ACluster BuyFirst Buy | Form 4 |
| Lappe Mark CEO | Buy | 5,895 | $99.29 | $585.34K | 0.8% | 711,443 | Sep 8, 2026 | ACluster BuyFirst Buy | Form 4 |
| Kayyem Jon Faiz Director | Buy | 5,000 | $113.52 | $567.58K | 1.2% | 424,360 | Sep 8, 2026 | BCluster BuyFirst Buy | Form 4 |
| Viking Global Opportunities Parent GP LLC Other | Sell | 25,042 | $32.25 | $807.60K | 19.6% | 102,864 | Oct 7, 2025 | — | Form 4 |
| Viking Global Opportunities Parent GP LLC Other | Sell | 308,643 | $32.25 | $9.95M | 19.6% | 1,267,823 | Oct 7, 2025 | — | Form 4 |
| Viking Global Opportunities Parent GP LLC Other | Sell | 16,315 | $32.25 | $526.16K | 19.6% | 67,018 | Oct 7, 2025 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Buy (P) — Open-market or private purchase
- Sell (S) — Open-market or private sale
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.