The insider buying cluster is directionally positive but too small in dollar terms to be a strong standalone signal. Monitor for additional insider purchases or a material catalyst (pipeline update, earnings) that could confirm the bullish view.
Price Chart
Executive Summary
Inhibrx Biosciences (INBX) insiders showed mixed activity in early September 2026: three directors/executives made open-market purchases totaling ~$991K, while one director sold ~$56K. The buying cluster includes CEO Mark Lappe ($136K) and director Jon Faiz Kayyem ($568K), signaling insider confidence at current levels. The cross-filing context confirms an amplifier pattern for insider clusters combined with earnings/press contexts, but the standalone dollar amounts are not material enough to warrant a strong directional call.
Key Financial Metrics
Key Facts
- CEO Mark Lappe bought 1,200 shares at $111.88 for $136K
- Director Jon Faiz Kayyem bought 5,000 shares at $113.52 for $568K
- Director Douglas Forsyth bought 2,500 shares at $114.65 for $287K
- Director Kimberly Manhard sold 500 shares at $111.78 for $56K
- Total insider buy value ~$991K vs. market cap of $1.6B (~0.06%)
- Net direction is mixed — 3 buys vs 1 sell, but sell is small relative to buys
Financial Impact
Insider buying of ~$991K represents 0.06% of market cap — modest signal
Risk Factors
- Insider buying is modest relative to market cap — may not indicate material conviction
- Director Manhard's sale, though small, introduces mixed signals
- No material corporate event or catalyst disclosed alongside the trades
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-INBX-1789539219985 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 14, 2026 13d ago | Insider Buy | $90.50 | awaiting T+60 | — | $95.66 (+5.70%) |
Sep 28, 2026 29d ago | Insider Cluster | $104.83 | awaiting T+60 | — | $95.66 (−8.75%) |
Sep 17, 2026 5w ago | Insider Cluster | $109.35 | awaiting T+60 | — | $95.66 (−12.52%) |
Sep 15, 2026 6w ago | Insider Cluster | $101.77 | awaiting T+60 | — | $95.66 (−6.00%) |
Sep 15, 2026 6w ago | 144 | $101.77 | awaiting T+60 | — | $95.66 (−6.00%) |
Sep 14, 2026 6w ago | 144 | $105.61 | awaiting T+60 | — | $95.66 (−9.42%) |
Sep 11, 2026 6w ago | 144 | $109.27 | awaiting T+60 | — | $95.66 (−12.46%) |
Sep 10, 2026 6w ago | Insider Cluster | $109.27 | awaiting T+60 | — | $95.66 (−12.46%) |
Sep 8, 2026 7w ago | Insider Cluster | $112.86 | awaiting T+60 | — | $95.66 (−15.24%) |
Sep 8, 2026 7w ago | Insider Buy | $112.86 | awaiting T+60 | — | $95.66 (−15.24%) |
US Market Status
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