14 insiders reported 113 Form 4 transactions for NewAmsterdam Pharma Co N.V. (NAMS) over the past 18 months (most recent 2026-09-15). Recent activity: Davidson Michael H. (Chief Executive Officer) Buy 10,000 shares, Smither John W (Director) Sell 1,600 shares, Gunning Robert William (Vice President, Controller) Buy 3,200 shares, Kastelein Johannes Jacob Pieter (Chief Scientific Officer) Buy 125,000 shares, Kastelein Johannes Jacob Pieter (Chief Scientific Officer) Sell 125,000 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-15 | Davidson Michael H. | Chief Executive Officer | Buy | 10,000 | $226,500 |
| 2026-09-09 | Smither John W | Director | Sell | 1,600 | $40,512 |
| 2026-09-03 | Gunning Robert William | Vice President, Controller | Buy | 3,200 | $0 |
| 2026-08-25 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Buy | 125,000 | $0 |
| 2026-08-25 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sell | 125,000 | $3.4M |
| 2026-07-22 | Kooij Louise Frederika | Chief Accounting Officer | Buy | 25,000 | $297,500 |
| 2026-07-22 | Kooij Louise Frederika | Chief Accounting Officer | Buy | 80,000 | $893,600 |
| 2026-07-22 | Kooij Louise Frederika | Chief Accounting Officer | Sell | 70,200 | $2.1M |
| 2026-07-22 | Kooij Louise Frederika | Chief Accounting Officer | Sell | 31,885 | $990,029 |
| 2026-07-22 | Kooij Louise Frederika | Chief Accounting Officer | Sell | 2,915 | $92,435 |
| 2026-06-24 | Kooij Louise Frederika | Chief Accounting Officer | Sell | 39,700 | $1.2M |
| 2026-06-24 | Kooij Louise Frederika | Chief Accounting Officer | Buy | 15,000 | $178,500 |
| 2026-06-24 | Kooij Louise Frederika | Chief Accounting Officer | Buy | 25,000 | $272,500 |
| 2026-06-24 | Kooij Louise Frederika | Chief Accounting Officer | Sell | 300 | $9,219 |
| 2026-05-27 | Kooij Louise Frederika | Chief Accounting Officer | Buy | 60,000 | $600,000 |
| 2026-05-27 | Kooij Louise Frederika | Chief Accounting Officer | Buy | 5,000 | $54,500 |
| 2026-05-27 | Kooij Louise Frederika | Chief Accounting Officer | Sell | 65,000 | $2.3M |
| 2026-03-12 | LANGE LOUIS G | Director | Sell | 44,173 | $1.3M |
| 2026-03-12 | LANGE LOUIS G | Director | Sell | 446 | $13,929 |
| 2026-03-10 | LANGE LOUIS G | Director | Sell | 28,186 | $828,950 |
| 2026-03-10 | LANGE LOUIS G | Director | Buy | 44,619 | $513,118 |
| 2026-03-09 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Buy | 104,467 | $0 |
| 2026-03-09 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sell | 104,467 | $3.2M |
| 2026-03-09 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Buy | 94,124 | $0 |
| 2026-03-09 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sell | 94,124 | $2.9M |
Source: SEC Form 4 filings · as of 2026-09-15