INBX insider trading — Inhibrx Biosciences, Inc.
Over the last 90 days, insiders at Inhibrx Biosciences, Inc. (INBX) made 8 open-market purchases worth $6.35M and 5 open-market sales worth $279K, making them net buyers by $6.07M. The largest purchase was by Lappe Mark (Chief Executive Officer), who bought 25,000 shares for $2.65M on Sep 8, 2026. The largest sale was by Manhard Kimberly (Director), who sold 500 shares for $58K on Sep 9, 2026. 3 different insiders bought shares in this period — a cluster buy, which many investors watch closely.
Updated Oct 16, 2026.
Recent INBX insider transactions
Every Form 4 filed by Inhibrx Biosciences, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Oct 14, 2026 | Lappe Mark | Chief Executive Officer | P · Purchase | Indirect | 10,040 | $84.56 | $849K | Form 4 |
| Sep 28, 2026 | Lappe Mark | Chief Executive Officer | P · Purchase | Indirect | 4,500 | $100.76 | $453K | Form 4 |
| Sep 25, 2026 | Lappe Mark | Chief Executive Officer | P · Purchase | Indirect | 5,500 | $99.16 | $545K | Form 4 |
| Sep 23, 2026 | Kayyem Jon Faiz | Director | P · Purchase | Indirect | 5,000 | $100.00 | $500K | Form 4 |
| Sep 16, 2026 | Kayyem Jon Faiz | Director | P · Purchase | Indirect | 5,000 | $100.00 | $500K | Form 4 |
| Sep 15, 2026 | Manhard Kimberly | Director | S · Sale | Indirect | 500 | $105.05 | $53K | Form 4 |
| Sep 14, 2026 | Manhard Kimberly | Director | S · Sale | Indirect | 500 | $110.26 | $55K | Form 4 |
| Sep 11, 2026 | Manhard Kimberly | Director | S · Sale | Indirect | 500 | $111.78 | $56K | Form 4 |
| Sep 9, 2026 | Manhard Kimberly | Director | S · Sale | Indirect | 500 | $115.80 | $58K | Form 4 |
| Sep 8, 2026 | Manhard Kimberly | Director | S · Sale | Indirect | 500 | $115.14 | $58K | Form 4 |
| Sep 8, 2026 | Kayyem Jon Faiz | Director | P · Purchase | Indirect | 5,000 | $113.52 | $568K | Form 4 |
| Sep 8, 2026 | Forsyth Douglas | Director | P · Purchase | Indirect | 2,500 | $114.65 | $287K | Form 4 |
| Sep 8, 2026 | Lappe Mark | Chief Executive Officer | P · Purchase | Indirect | 25,000 | $105.82 | $2.65M | Form 4 |
INBX insider trading FAQ
Are insiders buying INBX stock?
Yes. In the last 90 days, Inhibrx Biosciences, Inc. insiders made 8 open-market purchases totaling $6.35M, and 5 open-market sales totaling $279K. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading INBX?
Recent buyers: Forsyth Douglas, Kayyem Jon Faiz, Lappe Mark. Recent sellers: Manhard Kimberly.
Where does INBX insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.