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Insider Cluster (2 insiders) ·Filed Sep 8, 2026

INBX

Inhibrx Biosciences, Inc.
BULLISH
Impact 6/10
Horizonweeks Processed1mo ago
Insider cluster: 2 insiders, $951K total
Actionable Insight ▲ Bullish

CEO Lappe's large open-market purchases across multiple price points ($99-$112) indicate conviction. Monitor for upcoming catalysts (pipeline updates, partnership news) that may have prompted this buying. The cluster's size and CEO involvement make this a notable bullish signal.

DirectionBullish
Confidencehigh
Horizonweeks
Latest settled — T+20d ⚠ clustered
INBX ▼ -17.28% at T+20d
LONG call ✗ call lost -17.28% · α vs SPY -19.22% · entry $112.86 → $93.36
Next anchor: T+60d in 5w
Latest observation: T+32 -21.82% FF3 residual α
Entry = T+0 close
Sep 8, 2026
via day close
T+1d
-1.28%
call -1.28% · α -0.68%
$111.42
settled 7w ago
T+5d
-9.83%
call -9.83% · α -8.73%
$101.77
settled 6w ago
T+20d
-17.28%
call -17.28% · α -19.22%
$93.36
settled 22d ago
T+60d
Pending
in 5w

Price Chart

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Executive Summary

CEO Mark Lappe made a series of open-market purchases totaling ~$2.6M on September 8, 2026, and Director Douglas Forsyth also bought ~$287K worth of shares. This is a strong insider buying cluster by the CEO, signaling confidence in the company's prospects.

Key Financial Metrics

Direction
buying
Total Value
$2.9M
Insiders
2

Key Facts

  • CEO Mark Lappe purchased 24,000 shares in six open-market transactions on September 8, 2026, totaling approximately $2.6 million.
  • Director Douglas Forsyth purchased 2,500 shares at $114.65 on September 8, 2026, for ~$287,000.
  • Total insider buying in the cluster is approximately $2.9 million.
  • All transactions were open-market purchases (code P), not grants or option exercises.

Financial Impact

CEO purchased ~$2.6M in stock; total cluster ~$2.9M. Market cap not provided, but absolute dollar amounts are material for a biotech.

insider ownershipdilution

Risk Factors

  • Insider buying does not guarantee near-term stock performance; the stock may still be volatile.
  • No specific catalyst was disclosed alongside the purchases.

Investment Themes

Documents Analyzed

This report is based on 1 SEC document filed with EDGAR.

DocumentAccession Number
CLUSTER Data (Synthetic)cluster-INBX-1788899216242
18 reports for INBX
Performance horizon
50% Hit rate @ T+60 2 of 4 directional calls Went positive at some point 6 of 11 best @ T+60▲ +29.54%Jun 11, 2026
Filters
Rows
Reports for INBX — sortable, filterable
TypeNow
Oct 14, 2026
13d ago
Insider Buy
BULLISH ★ 4/10
$90.50awaiting T+60—$95.66 (+5.70%)
Sep 28, 2026
29d ago
Insider Cluster
BULLISH ★ 5/10
$104.83awaiting T+60—$95.66 (−8.75%)
Sep 17, 2026
5w ago
Insider Cluster
BULLISH ★ 5/10
$109.35awaiting T+60—$95.66 (−12.52%)
Sep 15, 2026
6w ago
Insider Cluster
NEUTRAL ★ 4/10
$101.77awaiting T+60—$95.66 (−6.00%)
Sep 15, 2026
6w ago
144
NEUTRAL ★ 2/10
$101.77awaiting T+60—$95.66 (−6.00%)
Sep 14, 2026
6w ago
144
NEUTRAL ★ 2/10
$105.61awaiting T+60—$95.66 (−9.42%)
Sep 11, 2026
6w ago
144
NEUTRAL ★ 2/10
$109.27awaiting T+60—$95.66 (−12.46%)
Sep 10, 2026
6w ago
Insider Cluster
BULLISH ★ 7/10
$109.27awaiting T+60—$95.66 (−12.46%)
Sep 8, 2026
7w ago
Insider Cluster
BULLISH ★ 6/10
$112.86awaiting T+60—$95.66 (−15.24%)
Sep 8, 2026
7w ago
Insider Buy
BULLISH ★ 6/10
$112.86awaiting T+60—$95.66 (−15.24%)
Showing 10 of 18

US Market Status

Market Closed — Opens Thu (10h 12m)

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Report published Sep 8, 2026