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I

INBX

Nasdaq

Inhibrx Biosciences, Inc.

Latest disclosureSeptember 28, 2026
Insider score Why 80?
80/ 100
Qualifying buys · 30d
$5.5M

14 purchases · 5 sales

Price by TradingViewDelayed quote from TradingView, for viewing only. It does not power Whale Atlas scores or alerts. If the quote does not load, open the TradingView link.

Insider transactions 28

Limited filing history
All28Buying14Selling5Other9
Filters

Last 30 daysInsiders bought $5.5M · 3 buyers, led by Mark Lappe (CEO) with $3.64M. Sales: $279.01K by 1 insider.

14 of 28 trades · April 24, 2026 – September 28, 2026Incomplete history: this shows the filings imported so far, not every filing ever made. Dates are trade dates. Filters affect this table only.

Showing the first 6 of 14 trades on this page.

Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$328.63K
Reported price
$98.8659 / share
Traded September 25, 2026Filed September 28, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$216.73K
Reported price
$99.5988 / share
Traded September 25, 2026Filed September 28, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$148.32K
Reported price
$98.8803 / share
Traded September 28, 2026Filed September 28, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$305.11K
Reported price
$101.702 / share
Traded September 28, 2026Filed September 28, 2026SEC filing
Purchase disclosed

Jon Faiz Kayyem

Director

Common Stock

Reported value
$500K
Reported price
$100.00 / share
Traded September 23, 2026Filed September 23, 2026SEC filing
Purchase disclosed

Jon Faiz Kayyem

Director

Common Stock

Reported value
$500K
Reported price
$100.00 / share
Traded September 16, 2026Filed September 17, 2026SEC filing
Purchase disclosed

Jon Faiz Kayyem

Director

Common Stock

Reported value
$567.58K
Reported price
$113.516 / share
Traded September 8, 2026Filed September 8, 2026SEC filing
Purchase disclosed

Douglas Forsyth

Director

Common Stock

Reported value
$286.62K
Reported price
$114.6469 / share
Traded September 8, 2026Filed September 8, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$585.34K
Reported price
$99.2948 / share
Traded September 8, 2026Filed September 8, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$664.72K
Reported price
$100.6388 / share
Traded September 8, 2026Filed September 8, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$117.84K
Reported price
$107.1239 / share
Traded September 8, 2026Filed September 8, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$54.12K
Reported price
$108.235 / share
Traded September 8, 2026Filed September 8, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$136.38K
Reported price
$111.8805 / share
Traded September 8, 2026Filed September 8, 2026SEC filing
Purchase disclosed

Mark Lappe

Chief Executive Officer

Common Stock

Reported value
$1.09M
Reported price
$112.2819 / share
Traded September 8, 2026Filed September 8, 2026SEC filing
Reporting insiderSecurity / transactionAmount / priceValueTraded / disclosedSource
Chief Executive OfficerCommon StockPurchase2 trades5,500avg $99.16 / share$545.36KSep 25Filed Sep 28 · 3d later
2 filings
  • 3,324 @ $98.87 · $328.63KSEC filing
  • 2,176 @ $99.60 · $216.73KSEC filing
Chief Executive OfficerCommon StockPurchase2 trades4,500avg $100.76 / share$453.43KSep 28Filed Sep 28 · 0d later
2 filings
  • 1,500 @ $98.88 · $148.32KSEC filing
  • 3,000 @ $101.70 · $305.11KSEC filing
DirectorCommon StockPurchase5,000$100.00 / share$500KSep 23Filed Sep 23 · 0d laterSEC filing
DirectorCommon StockPurchase5,000$100.00 / share$500KSep 16Filed Sep 17 · 1d laterSEC filing
DirectorCommon StockPurchase5,000$113.52 / share$567.58KSep 8Filed Sep 8 · 0d laterSEC filing
DirectorCommon StockPurchase2,500$114.65 / share$286.62KSep 8Filed Sep 8 · 0d laterSEC filing
Chief Executive OfficerCommon StockPurchase6 trades25,000avg $105.82 / share$2.65MSep 8Filed Sep 8 · 0d later
6 filings
  • 5,895 @ $99.29 · $585.34KSEC filing
  • 6,605 @ $100.64 · $664.72KSEC filing
  • 1,100 @ $107.12 · $117.84KSEC filing
  • 500 @ $108.24 · $54.12KSEC filing
  • 1,219 @ $111.88 · $136.38KSEC filing
  • 9,681 @ $112.28 · $1.09MSEC filing

Congress transactions 0

All Congress filings
No disclosed congressional trades for INBX in the imported filings.

This reflects the filings imported so far, not a complete trading history.

Explore furtherTechnical lab Company financials Test a strategy Compare company

Why this buying score?

Qualifying common-equity purchase value

$5,098,421 of common-equity purchase value after transaction-age decay across 180 days.

+25 pts

Distinct buying groups

3 distinct reporting-owner group(s). Joint rows count once; identity is not proof of discretion.

+20 pts

CEO purchase

Qualifying common-equity P acquisition; no disclosed plan, exercise or excluded purchase context detected.

+15 pts

Insider buying cluster

3 buying groups inside 30 transaction-date days, public by the snapshot cutoff.

+15 pts

Repeated purchases

A reporting-owner group bought on at least two distinct dates within the cluster window.

+5 pts

This score describes qualifying insider purchases at issuer level. Read the methodology

Sources and coverage

Limited filing history · Market-wide discovery does not establish complete company history. View coverage
Source
SEC EDGAR · Form 4
Issuer CIK
0002007919
Latest public acceptance
Sep 28, 2026, 09:47 PM UTC
Score calculated
Oct 7, 2026, 12:12 AM UTC
Parser
form4-parser-1.5
Classifier
form4-classifier-1.1
Scoring methodology
insider-experimental-1.1
Availability
Public filing time, not trade date

Open a transaction's SEC filing for the primary evidence. A code P may describe an open-market or private purchase; classification is not proof of intent.

Insider activity can have many explanations. Signal Strength is not a probability of profit or a recommendation to trade.