Kastelein Johannes Jacob Pieterinsider trades
In SEC Form 4 filings, Kastelein Johannes Jacob Pieter is listed as Chief Scientific Officer of NewAmsterdam Pharma Co N.V. (NAMS). In the last 90 days, Kastelein Johannes Jacob Pieter sold $4.62M of NewAmsterdam Pharma Co N.V. (NAMS) on the open market and bought none. All 2 sales were reported under a 10b5-1 trading plan.
Companies and roles
| Company | Role | Transactions | Last filed |
|---|---|---|---|
| NAMSNewAmsterdam Pharma Co N.V. | Chief Scientific Officer | 6 | Oct 2 |
Cluster buys
No cluster buy in the last 90 days included a purchase by this insider (two or more insiders buying within 14 days).
Form 4 historysince 2026-08-25
| Company | Traded | Filed | Type | Shares | Price | Value | Owned after | 10b5-1 plan | Filing |
|---|---|---|---|---|---|---|---|---|---|
| NAMSNewAmsterdam Pharma Co N.V. | Sep 30 | Oct 2 | M | 50,246 | not reported | not reported | 119,548 | Yes | Form 4 |
| NAMSNewAmsterdam Pharma Co N.V. | Sep 30 | Oct 2 | S | 50,246 | $25.03 | Sale −$1,257,657 | 69,302 | Yes | Form 4 |
| NAMSNewAmsterdam Pharma Co N.V. | Sep 30 | Oct 2 | M · derivative | 50,246 | $0.00 | $0 | 344,983 | Yes | Form 4 |
| NAMSNewAmsterdam Pharma Co N.V. | Aug 24 | Aug 25 | M | 125,000 | not reported | not reported | 194,302 | Yes | Form 4 |
| NAMSNewAmsterdam Pharma Co N.V. | Aug 24 | Aug 25 | S | 125,000 | $26.91 | Sale −$3,363,750 | 69,302 | Yes | Form 4 |
| NAMSNewAmsterdam Pharma Co N.V. | Aug 24 | Aug 25 | M · derivative | 125,000 | $0.00 | $0 | 395,229 | Yes | Form 4 |
Published from this insider's public Form 4 filings on SEC EDGAR; the name is shown as filed. Named in a filing and want this page removed? See the privacy policy.