NewAmsterdam Pharma Co N.V. (NAMS) Insider Ownership

Historic Insider Ownership Trends

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).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
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