Kastelein Johannes Jacob Pieter
Reporting owner on Forms 3, 4 and 5, CIK 2000389.
Kastelein Johannes Jacob Pieter reported on 1 issuer in 1 filing, the latest a Form 4 filed 2026-10-02.
Issuers
| Issuer | Roles in the latest filing | Filings | Last filed |
|---|---|---|---|
| NewAmsterdam Pharma Co N.V. CIK 1936258 | director, officer (Chief Scientific Officer) | 1 | 2026-10-02 |
Transactions and holdings
Every row of the person's Forms 3, 4 and 5, newest first, with the price and the amount owned after the row as filed.
| Security | Date | Code | Shares | Price | Owned after | Filing |
|---|---|---|---|---|---|---|
| NewAmsterdam Pharma Co N.V. Ordinary Shares | 2026-09-30 | M exercised | +50,246 | 119,548 | Form 4 | |
| NewAmsterdam Pharma Co N.V. Ordinary Shares | 2026-09-30 | S sold | -50,246 | $25.03 | 69,302 | Form 4 |
| NewAmsterdam Pharma Co N.V. Ordinary Shares, holding | 53,500 | Form 4 | ||||
| NewAmsterdam Pharma Co N.V. Option (right to buy), derivative | 2026-09-30 | M exercised | -50,246 | $0 | 344,983 | Form 4 |
Filings
The person's Forms 3, 4 and 5, and any 13D or 13G naming it.
| Filing | Subject | Filed | Accepted | Ingested |
|---|---|---|---|---|
| Form 4 0001193125-26-412431 | NewAmsterdam Pharma Co N.V. | 2026-10-02 |