Inhibrx Biosciences, Inc. (INBX) insider buying and selling
In the last 90 days at Inhibrx Biosciences, Inc. (INBX), 3 insiders made 19 open-market purchases worth $6.3M and 1 insider made 5 open-market sales worth $279K, as reported on SEC Form 4. Over the last 12 months, 3 insiders bought $6.3M of the stock, led by Mark Lappe (CEO), who bought $2.6M on Sep 8, 2026; 1 insider sold $279K.
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Unlock INBXRecent open-market insider trades
Trades by the same insider within a week are shown as one line.
| Date | Insider | Type | Shares | Price | Value |
|---|---|---|---|---|---|
| Mark Lappe CEO | Open market purchase 5 trades | 9,940 | avg. $84.55 | $840K | |
| Mark Lappe CEO | Open market purchase 4 trades | 10,000 | avg. $99.88 | $999K | |
| Jon Faiz Kayyem Director | Open market purchase 2 trades | 10,000 | avg. $100.00 | $1.0M | |
| KIMBERLY MANHARD Director | Open market sale 5 trades | 2,500 | avg. $111.60 | $279K | |
| Mark Lappe CEO | Open market purchase 6 trades | 25,000 | avg. $105.82 | $2.6M | |
| Jon Faiz Kayyem Director | Open market purchase | 5,000 | $113.52 | $568K | |
| DOUGLAS FORSYTH Director | Open market purchase | 2,500 | $114.65 | $287K |
What the INBX insider trades really mean
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Questions about INBX insider trading
Who bought Inhibrx Biosciences, Inc. (INBX) stock recently?
Insiders who bought Inhibrx Biosciences, Inc. stock on the open market in the last 12 months: Mark Lappe ($4.5M), Jon Faiz Kayyem ($1.6M), DOUGLAS FORSYTH ($287K). The most recent purchase was reported on Oct 14, 2026.
Are insiders buying or selling INBX?
Over the last 12 months insiders were net buyers of INBX on discretionary trades: $6.3M bought against $279K sold (scheduled and tax-related sales excluded).
What is a sell-to-cover or 10b5-1 sale?
A 10b5-1 sale is scheduled in advance under a pre-arranged plan, and a sell-to-cover sale is made to pay tax on vesting shares. Neither is a fresh decision to sell, so they say less about an insider's view than a discretionary sale.
Where does this data come from?
Officers, directors and large shareholders report their trades to the SEC on Form 4. This page lists the open-market purchases and sales by individual insiders from those public filings; funds and other institutions are not shown.
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How to read this page
Officers, directors and large shareholders must report their trades in company shares to the SEC on Form 4. This page lists open-market purchases and sales by individual insiders: trades made on the stock exchange at the going price. Funds and other institutions are not shown here.
Information from SEC EDGAR Form 4 filings, shown for general information only. It is not financial advice and does not recommend buying or selling any security. Trades are shown by transaction date and may be reported up to two business days later.