Insider filing · NAMS
Johannes Jacob Pieter Kastelein
Chief Scientific Officer
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NewAmsterdam Pharma Company N.V.
NAMS · Healthcare · 45 filings in 24 months
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Johannes Jacob Pieter Kastelein sold $9.1M of NewAmsterdam Pharma (NAMS)
Executed Mar 5, disclosed Mar 9, 4 days later.
Value, as filed
$9.1M
300,000 sh across 3 lots
Executed
Mar 5
the trade date, as filed
Disclosed
Mar 9
4 days after the trade
Return, 21 sessionsiFrom the disclosed entry session; derived
–
purchases only
Returns are measured on stock purchases only.
The filer
JKJohannes Jacob Pieter Kastelein (Chief Scientific Officer) filed 4 Form 4 reports in the trailing twelve months (0 purchases, 4 sales), most often in NewAmsterdam Pharma Company N.V. (NAMS). The largest single filing was $9.1M of NAMS (300,000 sh across 3 lots, as filed), executed Mar 5.
The name
NAMSHealthcare · NewAmsterdam Pharma Company N.V., a late-stage biopharmaceutical company, develops therapies to enhance patient care in populations with ca…
More Healthcare filings→ Insider filings, newest first→ View the original filing at www.sec.gov→Other filings by Johannes Jacob Pieter Kastelein in NAMS
NAMSSALE
NewAmsterdam Pharma Company N.V.
$3.4M125,000 sh × $26.91
Exec Aug 24
Filed Aug 25 · 4:30 PM ET NAMSSALE NewAmsterdam Pharma Company N.V. $1.6M
45,481 sh across 2 lots
Exec Feb 20
Filed Feb 24 · 5:30 PM ET NAMSSALE NewAmsterdam Pharma Company N.V. $200K
6,000 sh × $33.25
Exec Jan 5
Filed Jan 7 · 5:30 PM ET NAMSSALE NewAmsterdam Pharma Company N.V. $2.5M
100,000 sh across 3 lots
Exec Aug 21 2025
Filed Aug 25 2025 · 5:30 PM ET