NewAmsterdam Pharma Co NV (NAMS) insider trading
Every open-market stock purchase and sale by NewAmsterdam Pharma Co NV executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Insiders sold $55.4M over the last 12 months (16 sales). No open-market buys.
- Last insider buy: James N Topper (Insider), $15.6K, 13 months ago.
Last 12 months: insiders bought $0 (0 buys) and sold $55.4M (16 sales). Last close $31.52 on Jun 4, 2026.
Recent NAMS insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Jun 22, 2026 | Louise Frederika Kooij (C-suite exec) | Sold | $1.2M |
| Jun 22, 2026 | Louise Frederika Kooij (C-suite exec) | Sold | $9.2K |
| Jun 22, 2026 | Louise Frederika Kooij (C-suite exec) | Bought (not open market) | — |
| Jun 22, 2026 | Louise Frederika Kooij (C-suite exec) | Bought (not open market) | — |
| May 26, 2026 | Louise Frederika Kooij (C-suite exec) | Sold | $2.3M |
| May 26, 2026 | Louise Frederika Kooij (C-suite exec) | Bought (not open market) | — |
| May 26, 2026 | Louise Frederika Kooij (C-suite exec) | Bought (not open market) | — |
| Mar 11, 2026 | Louis G Lange (Insider) | Sold | $1.3M |
| Mar 11, 2026 | Louis G Lange (Insider) | Sold | $13.9K |
| Mar 9, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Sold | $3.1M |
| Mar 9, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Bought (not open market) | — |
| Mar 9, 2026 | Louis G Lange (Insider) | Bought (not open market) | — |
| Mar 6, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Sold | $2.9M |
| Mar 6, 2026 | Louis G Lange (Insider) | Sold | $829K |
| Mar 6, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Bought (not open market) | — |
| Mar 5, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Sold | $3.2M |
| Mar 5, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Bought (not open market) | — |
| Mar 2, 2026 | Michael H. Davidson (CEO) | Sold | $14.8M |
| Mar 2, 2026 | Michael H. Davidson (CEO) | Bought (not open market) | — |
| Feb 26, 2026 | Michael H. Davidson (CEO) | Sold | $5.6M |
| Feb 26, 2026 | Michael H. Davidson (CEO) | Sold | $617K |
| Feb 26, 2026 | Michael H. Davidson (CEO) | Bought (not open market) | — |
| Feb 25, 2026 | Michael H. Davidson (CEO) | Sold | $1.6M |
| Feb 25, 2026 | Michael H. Davidson (CEO) | Sold | $375K |
| Feb 25, 2026 | Michael H. Davidson (CEO) | Sold | $47.7K |
Who's trading NAMS
- Louise Frederika Kooij, C-suite exec: sold $13.6M (13 sales), last Jun 22, 2026
- Louis G Lange, Insider: sold $2.2M (3 sales), last Mar 11, 2026
- Johannes Jacob Pieter Kastelein, C-suite exec: sold $10.9M (6 sales), last Mar 9, 2026
- Michael H. Davidson, CEO: sold $25.3M (9 sales), last Mar 2, 2026
- Mayur Ian Somaiya, CFO: sold $3.4M (6 sales), last Jan 21, 2026
- Hilde Johanna van der Kamp, Insider: other filings, last Jan 7, 2026
- Adele M. Gulfo, Insider: other filings, last Jan 7, 2026
- William Lewis, Insider: other filings, last Jan 7, 2026
- Mark C. McKenna, Insider: other filings, last Jan 7, 2026
- John W Smither, Insider: other filings, last Jan 7, 2026
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