Reporting owner

Kastelein Johannes Jacob Pieter

Reporting owner CIK 0002000389 · Chief Scientific Officer · Director

These transactions appear in filings associated with this reporting owner. Jointly reported quantities and amounts are unallocated; they are not this owner's individual purchases or total holdings. Names and roles reflect the relevant filing, and a reporting owner may be a person or an organization.

Transaction timeline

Who reported an acquisition, and when the transaction occurred.

PurchaseStock awardGift receivedExercise / conversionConversionOther acquisition

1 dated transactions · 1 of 1 reporting owners shown. Select one owner to focus the chart.

View timeline as a table

Transaction date	Company / security	Reporting owners	Acquisition type
Sep 30, 2026	NewAmsterdam Pharma Co N.V.Ordinary Shares	Kastelein Johannes Jacob Pieter	Exercise / conversion

Only transactions on this page are shown. Date windows end on the latest transaction date in this sample. Joint filings may appear on more than one row. Sales are not included. Share-price charts use a separate data source.

Transactions in associated filings

Reported insider acquisitions, ordered by filing date, newest first. Currency is shown only when reported.
Filed / transacted	Company	Reporting owners	Type / security	Quantity	Price / reference value	Details
Oct 2, 2026Trade: Sep 30, 2026	NewAmsterdam Pharma Co N.V.NAMS · NAMSW · company listings	Kastelein Johannes Jacob PieterChief Scientific Officer · Director	Exercise / conversionOrdinary SharesNon-derivative security · Code M	50,246	Not reported *Value: Not reportedCurrency not specified	View ↗

1 transaction on this page. Filing date, newest first.