SEC reporting owner

Kastelein Johannes Jacob Pieter SEC insider disclosures

Explore Kastelein Johannes Jacob Pieter's reporting-owner identity, issuer relationships, purchases, sales and SEC filing receipts.

As of 2026-10-07T00:29:11.873Z

Reporting owner CIK
0002000389
Issuers
1
Coverage
verified

Issuer relationships

A reporting-owner CIK identifies the filer across issuer relationships and name aliases. A filer may be an individual or an organization; the filing role is the relevant evidence.

NewAmsterdam Pharma Co N.V.0001936258NAMSYesYes

Recent SEC transactions

Code P identifies a purchase, S a sale and A an award. Awards and open-market purchases describe different events. Use the public availability date when deciding when a researcher could have known about the transaction.

2026-10-022026-09-30NAMSS50,246Not reported
2026-08-262026-08-24NAMSS125,000Not reported
2026-03-102026-03-09NAMSS101,409Not reported
2026-03-102026-03-06NAMSS94,124Not reported
2026-03-102026-03-05NAMSS104,467Not reported
2026-02-252026-02-20NAMSS30,789Not reported
2026-02-252026-02-20NAMSS14,692Not reported
2026-01-082026-01-07NAMSA25,500Not reported
2026-01-082026-01-05NAMSS6,000Not reported
2026-01-082026-01-07NAMSA115,000Not reported
2025-08-262025-08-22NAMSS7,658Not reported
2025-08-262025-08-22NAMSS42,342Not reported
2025-08-262025-08-21NAMSS50,000Not reported
2025-03-292025-03-26NAMSA19,302Not reported
2025-03-292025-03-26NAMSA45,481Not reported
2025-01-082025-01-07NAMSA34,000Not reported
2025-01-072025-01-02NAMSA200,000Not reported

Up to 50 transactions from the recent two-year owner window.

Source evidence and strategy eligibility

The transactions below come from filings; a historical tracker separately simulates following eligible events. Joint filers can report the same transaction, and an owner can have filings at multiple companies. Public availability, amendment lineage and verified coverage determine which events a historical tracker may use.

The current directory marks this owner's filing coverage verified.