According to recent filings covering the 90 days ending February 10, 2026, the three most significant insider holders at NewAmsterdam Pharma are TenPercentOwner Nap B.V. Forgrowth (10.66Mn shares), Director James N Topper (3.03Mn shares), Chief Executive Officer Michael H. Davidson (459.86K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Nap B.V. Forgrowth | 10,656,172 | 02 Jan, 2025 | |
| James N Topper | 3,028,524 | 17 Sep, 2025 | |
| Michael H. Davidson | Chief Executive Officer | 459,859 | 09 Jan, 2026 |
| Johannes Jacob Pieter Kastelein | Chief Scientific Officer | 168,283 | 07 Jan, 2026 |
| Mayur Ian Somaiya | Chief Financial Officer | 58,382 | 22 Jan, 2026 |
| Michael F Iii Marino | Nan | 55,000 | 03 Jun, 2025 |
| Douglas F Kling | Chief Operating Officer | 44,000 | 17 Jul, 2025 |
| William A Jr Jones | Chief Commercial Officer | 43,000 | 07 Jan, 2025 |
| Louis G Lange | 38,546 | 09 Jan, 2026 | |
| Louise Frederika Kooij | Chief Accounting Officer | 24,353 | 29 Jan, 2026 |
| Juliette Berangere Audet | Chief Business Officer | 15,104 | 07 Jan, 2025 |
| Adele M. Gulfo | 14,260 | 09 Jan, 2026 | |
| William Lewis | 10,360 | 09 Jan, 2026 | |
| Der Kamp Hilde Johanna Van | 10,360 | 09 Jan, 2026 | |
| John W Smither | 10,360 | 09 Jan, 2026 | |
| Mark C. Mckenna | 10,360 | 09 Jan, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 28 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | A | 32,612 | $10.90 | 56,965 | D | M |
| 28 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | D | 32,612 | $31.80 | 24,353 | D | S |
| 27 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | D | 39,816 | $32.62 | 24,353 | D | S |
| 27 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | A | 39,816 | $10.90 | 64,169 | D | M |
| 26 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | A | 34,400 | $10.90 | 58,753 | D | M |
| 26 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | D | 309 | $33.45 | 24,353 | D | S |
| 26 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | D | 34,091 | $32.77 | 24,662 | D | S |
| 23 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | D | 12,767 | $34.37 | 24,353 | D | S |
| 23 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | A | 38,172 | $10.90 | 62,525 | D | M |
| 23 Jan, 2026 | Louise Frederika Kooij | Ordinary Shares | D | 25,405 | $33.44 | 37,120 | D | S |
| 21 Jan, 2026 | Mayur Ian Somaiya | Ordinary Shares | D | 24,362 | $33.80 | 58,382 | D | S |
| 21 Jan, 2026 | Mayur Ian Somaiya | Ordinary Shares | A | 39,784 | $9.26 | 98,166 | D | M |
| 21 Jan, 2026 | Mayur Ian Somaiya | Ordinary Shares | D | 15,422 | $33.25 | 82,744 | D | S |
| 20 Jan, 2026 | Mayur Ian Somaiya | Ordinary Shares | D | 19,604 | $32.38 | 58,382 | D | S |
| 20 Jan, 2026 | Mayur Ian Somaiya | Ordinary Shares | A | 60,216 | $9.26 | 118,598 | D | M |
| 20 Jan, 2026 | Mayur Ian Somaiya | Ordinary Shares | D | 39,712 | $31.78 | 77,986 | D | S |
| 20 Jan, 2026 | Mayur Ian Somaiya | Ordinary Shares | D | 900 | $30.64 | 117,698 | D | S |
| 07 Jan, 2026 | Louis G Lange | Ordinary Shares | A | 3,400 | - | 10,360 | D | A |
| 07 Jan, 2026 | William Lewis | Ordinary Shares | A | 3,400 | - | 10,360 | D | A |
| 07 Jan, 2026 | John W Smither | Ordinary Shares | A | 3,400 | - | 10,360 | D | A |