NewAmsterdam Pharma Co N.V. (NAMS) Insider Trading -- Recent Executive & Director Transactions
14 insiders reported 111 Form 4 transactions for NewAmsterdam Pharma Co N.V. (NAMS) over the past 18 months (most recent 2026-10-02). Recent activity: Kastelein Johannes Jacob Pieter (Chief Scientific Officer) Buy 50,246 shares, Kastelein Johannes Jacob Pieter (Chief Scientific Officer) Sell 50,246 shares, 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. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-02 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Buy | 50,246 | $0 |
| 2026-10-02 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sell | 50,246 | $1.3M |
| 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 | Buy | 25,000 | $272,500 |
| 2026-06-24 | Kooij Louise Frederika | Chief Accounting Officer | Buy | 15,000 | $178,500 |
| 2026-06-24 | Kooij Louise Frederika | Chief Accounting Officer | Sell | 39,700 | $1.2M |
| 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 |
Source: SEC Form 4 filings · as of 2026-10-02