Insider Transactions Reported by 20 Insiders of NewAmsterdam Pharma Co N.V.

Symbol
NAMS, NAMSW on Nasdaq
Location
Narrden, Netherlands

Insiders trading volume in the past year

NewAmsterdam Pharma Co N.V. executives and other stock owners filed with the SEC include:

Name Relationship Holdings Value Past Year Net Change Change % Report Date
ForGrowth NAP B.V. 10%+ Owner $272,125,599 30 Dec 2024
Bain Capital Life Sciences Investors, LLC 10%+ Owner $239,004,182 13 Dec 2024
James N. Topper Director $162,795,734 +$320,788 +0.2% 15 Sep 2025
Michael H. Davidson Chief Executive Officer, Director $5,790,288 -$25,328,349 -81% 02 Mar 2026
Johannes Jacob Pieter Kastelein Chief Scientific Officer, Director $2,099,157 -$13,368,006 -86% 05 Mar 2026
Mayur Ian Somaiya Chief Financial Officer $1,973,311 -$3,430,791 -63% 20 Jan 2026
William A. Jones Jr. Chief Commercial Officer $1,098,087 07 Jan 2025
Michael F. Marino III Chief Legal Officer and Corporate Secretary $1,040,600 01 Jun 2025
Douglas F. Kling Chief Operating Officer $928,400 -$4,025,796 -81% 15 Jul 2025
Louise Frederika Kooij Chief Accounting Officer $774,425 -$14,569,492 -95% 27 Jan 2026
Adele M. Gulfo Director $500,457 07 Jan 2026
Juliette Berangere Audet Chief Strategy and Business Officer $385,709 01 May 2025
John W. Smither Director $363,586 07 Jan 2026
Mark C. McKenna Director $363,586 07 Jan 2026
Hilde Johanna van der Kamp Director $363,586 07 Jan 2026
William Lewis Director $363,586 07 Jan 2026
Louis G. Lange Director $323,542 -$2,186,180 -87% 11 Mar 2026
Wouter Joustra Director 16 Jul 2024
Nicholas Downing Director 29 Dec 2023
Hugo Alexander Slootweg Director 29 Dec 2023

Recent Insider Transactions by Companies or Individuals for NewAmsterdam Pharma Co N.V.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % Value $ * Price $ Shares Shares Owned Date Ownership
Louis G. Lange NAMS Ordinary Shares Sale -81.2% $1,357,230 $30.42 -44,619 10,360 11 Mar 2026 Direct
Louis G. Lange NAMS Ordinary Shares Exercise of in-the-money or at-the-money derivative security 430.7% 44,619 54,979 09 Mar 2026 Direct
Louis G. Lange NAMS Warrant (right to buy) Exercise of in-the-money or at-the-money derivative security -100% -44,619 0 09 Mar 2026 Direct
Johannes Jacob Pieter Kastelein NAMS Ordinary Shares Sale -59.4% $3,071,679 $30.29 -101,409 69,302 09 Mar 2026 See footnote
Johannes Jacob Pieter Kastelein NAMS Ordinary Shares Options Exercise 146.3% 101,409 170,711 09 Mar 2026 See footnote
Johannes Jacob Pieter Kastelein NAMS Option (right to buy) Options Exercise -16.3% -101,409 520,229 09 Mar 2026 See footnote
Louis G. Lange NAMS Ordinary Shares Sale -100% $828,950 $29.41 -28,186 0 06 Mar 2026 See footnote
Johannes Jacob Pieter Kastelein NAMS Ordinary Shares Sale -57.6% $2,853,840 $30.32 -94,124 69,302 06 Mar 2026 See footnote
Johannes Jacob Pieter Kastelein NAMS Ordinary Shares Options Exercise 135.8% 94,124 163,426 06 Mar 2026 See footnote
Johannes Jacob Pieter Kastelein NAMS Option (right to buy) Options Exercise -13.2% -94,124 621,638 06 Mar 2026 See footnote
Johannes Jacob Pieter Kastelein NAMS Ordinary Shares Sale -60.1% $3,165,350 $30.30 -104,467 69,302 05 Mar 2026 See footnote
Johannes Jacob Pieter Kastelein NAMS Ordinary Shares Options Exercise 150.7% 104,467 173,769 05 Mar 2026 See footnote
Johannes Jacob Pieter Kastelein NAMS Option (right to buy) Options Exercise -12.7% -104,467 715,762 05 Mar 2026 See footnote
Michael H. Davidson NAMS Ordinary Shares Sale -71.8% $14,753,258 $33.25 -443,707 174,144 02 Mar 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Options Exercise 254.8% 443,707 617,851 02 Mar 2026 Direct
Michael H. Davidson NAMS Option (right to buy) Options Exercise -65% -443,707 239,267 02 Mar 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Sale -51.3% $6,179,974 $33.71 -183,332 174,144 26 Feb 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Options Exercise 39.9% 183,332 643,191 26 Feb 2026 Direct
Michael H. Davidson NAMS Option (right to buy) Options Exercise -21.2% -183,332 682,974 26 Feb 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Sale -11.2% $2,056,174 $35.30 -58,253 459,859 25 Feb 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Options Exercise 12.7% 58,253 518,112 25 Feb 2026 Direct
Michael H. Davidson NAMS Option (right to buy) Options Exercise -6.3% -58,253 866,306 25 Feb 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Sale -12.3% $2,338,943 $36.15 -64,708 459,859 24 Feb 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Options Exercise 14.1% 64,708 524,567 24 Feb 2026 Direct
Michael H. Davidson NAMS Option (right to buy) Options Exercise -6.54% -64,708 924,559 24 Feb 2026 Direct
Johannes Jacob Pieter Kastelein NAMS Ordinary Shares Sale -46% $1,605,998 $35.31 -45,481 53,500 20 Feb 2026 Direct
Louise Frederika Kooij NAMS Ordinary Shares Sale -57.2% $1,037,062 $31.80 -32,612 24,353 28 Jan 2026 Direct
Louise Frederika Kooij NAMS Ordinary Shares Options Exercise 133.9% 32,612 56,965 28 Jan 2026 Direct
Louise Frederika Kooij NAMS Option (right to buy) Options Exercise -30.8% -32,612 73,134 28 Jan 2026 Direct
Louise Frederika Kooij NAMS Ordinary Shares Sale -62% $1,298,798 $32.62 -39,816 24,353 27 Jan 2026 Direct
Louise Frederika Kooij NAMS Ordinary Shares Options Exercise 163.5% 39,816 64,169 27 Jan 2026 Direct
Louise Frederika Kooij NAMS Option (right to buy) Options Exercise -27.4% -39,816 105,746 27 Jan 2026 Direct
Louise Frederika Kooij NAMS Ordinary Shares Sale -58.6% $1,127,498 $32.78 -34,400 24,353 26 Jan 2026 Direct
Louise Frederika Kooij NAMS Ordinary Shares Options Exercise 141.3% 34,400 58,753 26 Jan 2026 Direct
Louise Frederika Kooij NAMS Option (right to buy) Options Exercise -19.1% -34,400 145,562 26 Jan 2026 Direct
Louise Frederika Kooij NAMS Ordinary Shares Sale -61% $1,288,345 $33.75 -38,172 24,353 23 Jan 2026 Direct
Louise Frederika Kooij NAMS Ordinary Shares Options Exercise 156.7% 38,172 62,525 23 Jan 2026 Direct
Louise Frederika Kooij NAMS Option (right to buy) Options Exercise -17.5% -38,172 179,962 23 Jan 2026 Direct
Mayur Ian Somaiya NAMS Ordinary Shares Sale -40.5% $1,336,217 $33.59 -39,784 58,382 21 Jan 2026 Direct
Mayur Ian Somaiya NAMS Ordinary Shares Options Exercise 68.1% 39,784 98,166 21 Jan 2026 Direct
Mayur Ian Somaiya NAMS Option (Right to Buy) Options Exercise -5.66% -39,784 662,814 21 Jan 2026 Direct
Mayur Ian Somaiya NAMS Ordinary Shares Sale -50.8% $1,924,401 $31.96 -60,216 58,382 20 Jan 2026 Direct
Mayur Ian Somaiya NAMS Ordinary Shares Options Exercise 103.1% 60,216 118,598 20 Jan 2026 Direct
Mayur Ian Somaiya NAMS Option (Right to Buy) Options Exercise -7.89% -60,216 702,598 20 Jan 2026 Direct
Hilde Johanna van der Kamp NAMS Ordinary Shares Award 48.8% 3,400 10,360 07 Jan 2026 Direct
Hilde Johanna van der Kamp NAMS Option (right to buy) Award 15,300 15,300 07 Jan 2026 Direct
Adele M. Gulfo NAMS Ordinary Shares Award 31.3% 3,400 14,260 07 Jan 2026 Direct
Adele M. Gulfo NAMS Option (right to buy) Award 15,300 15,300 07 Jan 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Award 21.4% 81,000 459,859 07 Jan 2026 Direct
Michael H. Davidson NAMS Ordinary Shares Sale -2.97% -11,582 378,859 07 Jan 2026 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.