Johannes Jacob Pieter Kastelein
Chief Scientific Officer at NewAmsterdam Pharma Company N.V.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 3 years
- Director since
- 2023
3 years of board service in total across 1 board, counting each seat separately. Longest: NewAmsterdam Pharma Company N.V., 2 years.
NewAmsterdam Pharma Company N.V.
Director · Chief Scientific Officer
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Aug 22, 2025 | NewAmsterdam Pharma Company N.V. | Open-market sale | −42,342 | $25.08 | $1,061,937 |
| Aug 22, 2025 | NewAmsterdam Pharma Company N.V. | Open-market sale | −7,658 | $25.49 | $195,202 |
| Aug 21, 2025 | NewAmsterdam Pharma Company N.V. | Open-market sale | −50,000 | $24.29 | $1,214,500 |
| Mar 26, 2025 | NewAmsterdam Pharma Company N.V. | Grant or award | +19,302 | — | — |
| Mar 26, 2025 | NewAmsterdam Pharma Company N.V. | Option exercise | +45,481 | — | — |
| Mar 24, 2025 | NewAmsterdam Pharma Company N.V. | Option exercise | +150,000 | — | — |
| Jan 7, 2025 | NewAmsterdam Pharma Company N.V. | Grant or award | +34,000 | — | — |
| Mar 26, 2024 | NewAmsterdam Pharma Company N.V. | Option exercise | +201,673 | — | — |
| Mar 26, 2024 | NewAmsterdam Pharma Company N.V. | Shares withheld for tax | −11,197 | $22.72 | $254,396 |
| Mar 26, 2024 | NewAmsterdam Pharma Company N.V. | Open-market sale | −190,476 | $21.50 | $4,095,234 |
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