| Insider | Role | Shares | Value | Buys | Sells |
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| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
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| Insider | Role | Shares | Value | Buys | Sells |
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| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
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Chief Scientific Officer
1 company
Kastelein Johannes Jacob Pieter is a Chief Scientific Officer at NewAmsterdam Pharma Co N.V.. Recent SEC Form 4 filings include 0 buys and 5 sells.
Estimated insider holdings value: $4.0M based on current market prices.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Jan 5, 2026 | NAMS Newamsterdam Pharma Co N.V. | Chief Scientific Officer | Sell | 6,000 | $33.25 | $199,500.00 | -7.5% | +1.9% | - | |
| Aug 22, 2025 | NAMS Newamsterdam Pharma Co N.V. | Chief Scientific Officer | Sell | 100,000 | $24.72 | $2,471,639.78 | -27.4% | +50.8% | - | |
| Mar 26, 2024 | NAMS Newamsterdam Pharma Co N.V. | Chief Scientific Officer | Sale+OE | 190,476 | $21.50 | $4,095,234.00 | -100% | -13.6% | -0.7% |