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

Historic Insider Ownership Trends

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Nap B.V. Forgrowth 0 10,656,172 02 Jan, 2025
James N Topper 0 3,028,524 17 Sep, 2025
Michael H. Davidson Chief Executive Officer 174,144 0 02 Mar, 2026
Johannes Jacob Pieter Kastelein Chief Scientific Officer 0 69,302 09 Mar, 2026
Mayur Ian Somaiya Chief Financial Officer 58,382 0 22 Jan, 2026
Johannes Jacob Pieter Kastelein Chief Scientific Officer 53,500 0 24 Feb, 2026
Douglas F Kling Chief Operating Officer 44,000 0 17 Jul, 2025
Louise Frederika Kooij Chief Accounting Officer 24,353 0 29 Jan, 2026
Juliette Berangere Audet Chief Business Officer 15,104 0 07 Jan, 2025
Adele M. Gulfo 14,260 0 09 Jan, 2026
Louis G Lange 10,360 0 12 Mar, 2026
Mark C. Mckenna 10,360 0 09 Jan, 2026
Der Kamp Hilde Johanna Van 10,360 0 09 Jan, 2026
John W Smither 10,360 0 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
11 Mar, 2026 Louis G Lange Ordinary Shares D 44,173 $30.41 10,806 D S
11 Mar, 2026 Louis G Lange Ordinary Shares D 446 $31.23 10,360 D S
06 Mar, 2026 Louis G Lange Ordinary Shares D 28,186 $29.41 0 I S
09 Mar, 2026 Louis G Lange Ordinary Shares A 44,619 $11.50 54,979 D X
09 Mar, 2026 Louis G Lange Warrant (right to buy) D 44,619 $0.00 0 D X
05 Mar, 2026 Johannes Jacob Pieter Kastelein Ordinary Shares A 104,467 - 173,769 I M
05 Mar, 2026 Johannes Jacob Pieter Kastelein Ordinary Shares D 104,467 $30.30 69,302 I S
06 Mar, 2026 Johannes Jacob Pieter Kastelein Ordinary Shares A 94,124 - 163,426 I M
06 Mar, 2026 Johannes Jacob Pieter Kastelein Ordinary Shares D 94,124 $30.32 69,302 I S
09 Mar, 2026 Johannes Jacob Pieter Kastelein Ordinary Shares A 101,409 - 170,711 I M
09 Mar, 2026 Johannes Jacob Pieter Kastelein Ordinary Shares D 101,409 $30.29 69,302 I S
05 Mar, 2026 Johannes Jacob Pieter Kastelein Option (right to buy) D 104,467 $0.00 715,762 I M
06 Mar, 2026 Johannes Jacob Pieter Kastelein Option (right to buy) D 94,124 $0.00 621,638 I M
09 Mar, 2026 Johannes Jacob Pieter Kastelein Option (right to buy) D 101,409 $0.00 520,229 I M
02 Mar, 2026 Michael H. Davidson Ordinary Shares A 443,707 - 617,851 D M
02 Mar, 2026 Michael H. Davidson Ordinary Shares D 443,707 $33.25 174,144 D S
02 Mar, 2026 Michael H. Davidson Option (right to buy) D 443,707 $0.00 239,267 D M
24 Feb, 2026 Michael H. Davidson Ordinary Shares A 64,708 - 524,567 D M
24 Feb, 2026 Michael H. Davidson Ordinary Shares D 61,547 $36.13 463,020 D S
24 Feb, 2026 Michael H. Davidson Ordinary Shares D 3,161 $36.46 459,859 D S