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
- Michael H. Davidson (CEO) bought $227K in the last 90 days.
- Johannes Jacob Pieter Kastelein (C-suite exec) and 1 other sold $4.7M in the last 90 days.
Last 12 months: insiders bought $227K (1 buy) and sold $63.3M (20 sales). Last close $21.58 on Oct 22, 2026.
Recent NAMS insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Sep 30, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Sold | $1.3M |
| Sep 30, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Bought (not open market) | — |
| Sep 30, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Bought (not open market) | — |
| Sep 14, 2026 | Michael H. Davidson (CEO) | Bought | $227K |
| Sep 4, 2026 | John W Smither (Insider) | Sold | $40.5K |
| Sep 1, 2026 | Robert William Gunning (President) | Bought (not open market) | — |
| Sep 1, 2026 | Robert William Gunning (President) | Bought (not open market) | — |
| Aug 24, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Sold | $3.4M |
| Aug 24, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Bought (not open market) | — |
| Aug 24, 2026 | Johannes Jacob Pieter Kastelein (C-suite exec) | Bought (not open market) | — |
| Jul 20, 2026 | Louise Frederika Kooij (C-suite exec) | Sold | $2.1M |
| Jul 20, 2026 | Louise Frederika Kooij (C-suite exec) | Sold | $990K |
| Jul 20, 2026 | Louise Frederika Kooij (C-suite exec) | Bought (not open market) | $894K |
| Jul 20, 2026 | Louise Frederika Kooij (C-suite exec) | Bought (not open market) | $298K |
| Jul 20, 2026 | Louise Frederika Kooij (C-suite exec) | Sold | $92.4K |
| Jul 20, 2026 | Louise Frederika Kooij (C-suite exec) | Bought (not open market) | — |
| Jul 20, 2026 | Louise Frederika Kooij (C-suite exec) | Bought (not open market) | — |
| 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 |
Who's trading NAMS
- Johannes Jacob Pieter Kastelein, C-suite exec: sold $15.5M (8 sales), last Sep 30, 2026
- Michael H. Davidson, CEO: bought $227K (1 buy), sold $25.3M (9 sales), last Sep 14, 2026
- John W Smither, Insider: sold $40.5K (1 sale), last Sep 4, 2026
- Robert William Gunning, President: other filings, last Sep 1, 2026
- Louise Frederika Kooij, C-suite exec: sold $16.8M (16 sales), last Jul 20, 2026
- Louis G Lange, Insider: sold $2.2M (3 sales), last Mar 11, 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
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