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Kastelein Johannes Jacob Pieter
InsiderCIK 0002000389
Largest Purchase
No open-market purchases in the recent filings.
Profile
- Filings
- 6
- Buy transactions
- 0
- Sell transactions
- 11
- Companies
- 1
- Active
- 2025–2026
Across 6 filings between 2025–2026, Kastelein Johannes Jacob Pieter has disclosed $22.1M in transactions — all concentrated in NewAmsterdam Pharma Co N.V. (NAMS). Their disclosed trades are heavily weighted toward selling — $0 in buys and $18.0M in sells. Data is sourced from official SEC Form 3, 4, and 5 filings.
Associated Companies
Trading History
6 loaded
| Oct 2 | NAMS NewAmsterdam Pharma Co N.V. | Kastelein Johannes Jacob Pieter | Insider | Sell | $1.3M |
| Aug 25 | NAMS NewAmsterdam Pharma Co N.V. | Kastelein Johannes Jacob Pieter | Insider | Sell | $3.4M |
| Mar 9 | NAMS NewAmsterdam Pharma Co N.V. | Kastelein Johannes Jacob Pieter | Insider | Sell | $9.1M |
| Feb 24 | NAMS NewAmsterdam Pharma Co N.V. | Kastelein Johannes Jacob Pieter | Insider | Sell | $1.6M |
| Jan 7 | NAMS NewAmsterdam Pharma Co N.V. | Kastelein Johannes Jacob Pieter | Insider | Sell | $199.5K |
| Aug 25 | NAMS NewAmsterdam Pharma Co N.V. | Kastelein Johannes Jacob Pieter | Insider | Sell | $2.5M |
6 filings