NewAmsterdam Pharma Co N.V. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Kooij Louise Frederika | Chief Accounting Officer | Option Exercise | 26,011 | $10.00 | $260,110 | 41,011 | Dec 26, 2025 |
| Topper James N | — | Purchase | 660 | $23.70 | $15,642 | 3,028,524 | Sep 15, 2025 |
| Kooij Louise Frederika | Chief Accounting Officer | Sale | 53,104 | $25.31 | $1,344,062 | 111,896 | Sep 9, 2025 |
| Topper James N | — | Purchase | 1,260 | $24.99 | $31,487 | 3,027,864 | Sep 8, 2025 |
| Kooij Louise Frederika | Chief Accounting Officer | Sale | 18,073 | $25.09 | $453,452 | 15,000 | Sep 3, 2025 |
| Kooij Louise Frederika | Chief Accounting Officer | Option Exercise | 18,073 | — | — | 33,073 | Sep 2, 2025 |
| Kooij Louise Frederika | Chief Accounting Officer | Sale | 8,269 | $24.86 | $205,567 | 15,000 | Aug 25, 2025 |
| Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sale | 42,342 | $25.08 | $1,061,937 | 76,960 | Aug 21, 2025 |
| Topper James N | — | Purchase | 471 | $23.98 | $11,295 | 3,026,604 | Aug 11, 2025 |
| Kling Douglas F | Chief Operating Officer | Sale | 51,043 | $21.10 | $1,077,007 | 44,000 | Jul 15, 2025 |
| Topper James N | — | Purchase | 1,260 | $18.26 | $23,008 | 3,026,133 | Jun 24, 2025 |
| Kling Douglas F | Chief Operating Officer | Sale | 81,891 | $19.19 | $1,571,488 | 62,109 | Jun 16, 2025 |
| Topper James N | — | Purchase | 8,584 | $19.50 | $167,388 | 3,022,153 | Jun 16, 2025 |
| Marino Michael F III | See Remarks | Award / Grant | 55,000 | — | — | 55,000 | Jun 1, 2025 |
| LANGE LOUIS G | — | Option Exercise | 68 | — | — | 28,186 | Jun 1, 2025 |
| Kling Douglas F | Chief Operating Officer | Sale | 100,000 | — | — | 44,000 | May 15, 2025 |
| LANGE LOUIS G | — | Option Exercise | 69 | — | — | 28,118 | May 1, 2025 |
| Kling Douglas F | Chief Operating Officer | Sale | 910 | — | — | 44,000 | Apr 15, 2025 |
| Gulfo Adele M. | — | Award / Grant | 10,860 | — | — | 10,860 | Apr 15, 2025 |
| LANGE LOUIS G | — | Option Exercise | 69 | — | — | 28,049 | Apr 14, 2025 |
| Topper James N | — | Purchase | 1,135 | $22.49 | $25,526 | 3,013,569 | Mar 26, 2025 |
| Kooij Louise Frederika | Chief Accounting Officer | Option Exercise | 8,269 | — | — | 23,269 | Mar 26, 2025 |
| LANGE LOUIS G | — | Option Exercise | 3,102 | — | — | 10,062 | Mar 26, 2025 |
| Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Award / Grant | 19,302 | — | — | 169,302 | Mar 26, 2025 |
| Kling Douglas F | Chief Operating Officer | Option Exercise | 16,539 | — | — | 60,539 | Mar 26, 2025 |
| Davidson Michael H. | Chief Executive Officer | Award / Grant | 30,992 | — | — | 364,305 | Mar 26, 2025 |
| Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Option Exercise | 150,000 | — | — | 150,000 | Mar 24, 2025 |
| Kling Douglas F | Chief Operating Officer | Sale | 100,000 | — | — | 44,000 | Mar 17, 2025 |
| Topper James N | — | Purchase | 4,005 | $21.02 | $84,185 | 3,012,434 | Mar 4, 2025 |
| Kooij Louise Frederika | Chief Accounting Officer | Sale | 150,000 | $20.37 | $3,055,500 | 15,000 | Mar 4, 2025 |
| Kling Douglas F | Chief Operating Officer | Option Exercise | 9,218 | — | — | 53,218 | Feb 18, 2025 |
| Kling Douglas F | Chief Operating Officer | Sale | 56,863 | — | — | 44,000 | Jan 30, 2025 |
| Kling Douglas F | Chief Operating Officer | Option Exercise | 25,385 | — | — | 69,385 | Jan 28, 2025 |
| Somaiya Mayur Ian | Chief Financial Officer | Option Exercise | 14,900 | $9.26 | $137,974 | 52,900 | Jan 27, 2025 |
| Smither John W | — | Award / Grant | 6,960 | — | — | 6,960 | Jan 7, 2025 |
| McKenna Mark C. | — | Award / Grant | 6,960 | — | — | 6,960 | Jan 7, 2025 |
| Lewis William | — | Award / Grant | 6,960 | — | — | 6,960 | Jan 7, 2025 |
| van der Kamp Hilde Johanna | — | Award / Grant | 6,960 | — | — | 6,960 | Jan 7, 2025 |
| LANGE LOUIS G | — | Award / Grant | 6,960 | — | — | 6,960 | Jan 7, 2025 |
| Kooij Louise Frederika | Chief Accounting Officer | Award / Grant | 15,000 | — | — | 15,000 | Jan 7, 2025 |
| Davidson Michael H. | Chief Executive Officer | Award / Grant | 123,529 | — | — | 123,529 | Jan 7, 2025 |
| Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Award / Grant | 34,000 | — | — | 34,000 | Jan 7, 2025 |
| Audet Juliette Berangere | Chief Business Officer | Award / Grant | 14,000 | — | — | 15,104 | Jan 7, 2025 |
| JONES WILLIAM A JR | Chief Commercial Officer | Award / Grant | 43,000 | — | — | 43,000 | Jan 7, 2025 |
| Kling Douglas F | Chief Operating Officer | Award / Grant | 44,000 | — | — | 44,000 | Jan 7, 2025 |
| Somaiya Mayur Ian | Chief Financial Officer | Award / Grant | 38,000 | — | — | 38,000 | Jan 7, 2025 |
| ForGrowth NAP B.V. | — | Sale | 29,846 | $25.54 | $762,267 | 10,656,172 | Dec 30, 2024 |
| Forbion Capital Fund IV Cooperatief U.A. | — | Sale | 33,438 | $26.01 | $869,722 | 10,727,490 | Dec 27, 2024 |
| Forbion IV Management B.V. | — | Sale | 16,164 | $25.66 | $414,768 | 10,760,928 | Dec 20, 2024 |
| ForGrowth NAP B.V. | — | Sale | 46,210 | $26.55 | $1,226,876 | 10,908,502 | Dec 19, 2024 |