13 insiders reported 125 Form 4 transactions for NewAmsterdam Pharma Co N.V. (NAMS) over the past 18 months (most recent 2026-07-22). Recent activity: Kooij Louise Frederika (Chief Accounting Officer) Buy 80,000 shares, Kooij Louise Frederika (Chief Accounting Officer) Sell 70,200 shares, Kooij Louise Frederika (Chief Accounting Officer) Buy 25,000 shares, Kooij Louise Frederika (Chief Accounting Officer) Sell 31,885 shares, Kooij Louise Frederika (Chief Accounting Officer) Sell 2,915 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 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 | Buy | 25,000 | $297,500 |
| 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 | 446 | $13,929 |
| 2026-03-12 | LANGE LOUIS G | Director | Sell | 44,173 | $1.3M |
| 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 | Buy | 101,409 | $0 |
| 2026-03-09 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sell | 101,409 | $3.1M |
| 2026-03-09 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sell | 94,124 | $2.9M |
| 2026-03-02 | Davidson Michael H. | Chief Executive Officer | Buy | 443,707 | $0 |
| 2026-03-02 | Davidson Michael H. | Chief Executive Officer | Sell | 443,707 | $14.8M |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Buy | 64,708 | $0 |
Source: SEC Form 4 filings · as of 2026-07-22