13 insiders reported 138 Form 4 transactions for NewAmsterdam Pharma Co N.V. (NAMS) over the past 18 months (most recent 2026-06-24). Recent activity: Kooij Louise Frederika (Chief Accounting Officer) Buy 25,000 shares, Kooij Louise Frederika (Chief Accounting Officer) Buy 15,000 shares, Kooij Louise Frederika (Chief Accounting Officer) Sell 39,700 shares, Kooij Louise Frederika (Chief Accounting Officer) Sell 300 shares, LANGE LOUIS G (Director) Sell 44,173 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 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 |
| 2026-03-12 | 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 | 101,409 | $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 |
| 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 | Buy | 104,467 | $0 |
| 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 | Sell | 165,408 | $5.6M |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Buy | 64,708 | $0 |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Sell | 61,547 | $2.2M |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Sell | 3,161 | $115,250 |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Buy | 58,253 | $0 |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Sell | 46,517 | $1.6M |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Sell | 10,436 | $375,279 |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Sell | 1,300 | $47,684 |
| 2026-02-26 | Davidson Michael H. | Chief Executive Officer | Buy | 183,332 | $0 |
Source: SEC Form 4 filings · as of 2026-06-24