NewAmsterdam Pharma Co N.V. (NAMS)
Data as of , from SEC Form 4 filings.
Net insider selling (90d)Watch NAMS
See up to 3 months of NAMS. The 7-day demo opens the 1M and 3M ranges and puts NAMS on your watchlist.
Start 7-day demoLatest NAMS insider trades
About NewAmsterdam Pharma Co N.V. (NAMS)
NewAmsterdam Pharma Co N.V. files with the SEC under CIK 0001936258 and is classified as pharmaceutical preparations. We track it alongside the rest of the Health Care sector.
NAMS Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market purchase | 1 | 10,000 | $227K |
| Open-market sale | 6 | 281,846 | $7.85M |
| Grant or award | 2 | 17,200 | |
NAMS insider transactions (Form 4)
12051 Form 4 filings on record, the earliest from Oct 1, 2024, newest first. Filing history page 1 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Ordinary Shares | 50,246 | - footnote F1 | - | |
| Johannes Jacob Pieter Kastelein - Officer | Open-market sale | Ordinary Shares | 50,246 | $25.03 footnote F3 | $1.26M | |
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Option (right to buy) | 50,246 | $0.00 | - | |
| ||||||
| Michael H. Davidson - Officer | Open-market purchase | Ordinary Shares | 10,000 | $22.65 | $227K | |
 John W. Smither - Director | Open-market sale | Ordinary Shares | 1,600 | $25.32 footnote F2 | $41K | |
| ||||||
| Robert William Gunning - Officer | Grant or award | Ordinary Shares | 3,200 footnote F1 | $0.00 | - | |
| Robert William Gunning - Officer | Grant or award | Option (right to buy) | 14,000 | $0.00 | - | |
| ||||||
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Ordinary Shares | 125,000 | - footnote F1 | - | |
| Johannes Jacob Pieter Kastelein - Officer | Open-market sale | Ordinary Shares | 125,000 | $26.91 footnote F3 | $3.36M | |
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Option (right to buy) | 125,000 | $0.00 | - | |
| ||||||
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 25,000 | $11.90 | $298K | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 80,000 | $11.17 | $894K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 70,200 | $29.96 footnote F2 | $2.10M | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 31,885 | $31.05 footnote F3 | $990K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 2,915 | $31.71 footnote F4 | $92K | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 25,000 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 80,000 | $0.00 | - | |
| ||||||
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 25,000 | $10.90 | $273K | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 15,000 | $11.90 | $179K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 39,700 | $30.20 footnote F1 | $1.20M | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 300 | $30.73 | $9K | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 25,000 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 15,000 | $0.00 | - | |
| ||||||
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 60,000 | $10.00 | $600K | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 5,000 | $10.90 | $55K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 65,000 | $35.69 footnote F1 | $2.32M | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 60,000 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 5,000 | $0.00 | - | |
| ||||||
| Louis G. Lange | Open-market sale | Ordinary Shares | 44,173 | $30.41 footnote F1 | $1.34M | |
| Louis G. Lange | Open-market sale | Ordinary Shares | 446 | $31.23 footnote F2 | $14K | |
| ||||||
| Louis G. Lange | Other | Ordinary Shares | 44,619 | $11.50 | $513K | |
| Louis G. Lange | Other | Warrant (right to buy) | 44,619 | $0.00 | - | |
| Louis G. Lange | Open-market sale | Ordinary Shares | 28,186 | $29.41 footnote F1 | $829K | |
| ||||||
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Option (right to buy) | 104,467 | $0.00 | - | |
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Option (right to buy) | 94,124 | $0.00 | - | |
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Option (right to buy) | 101,409 | $0.00 | - | |
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Ordinary Shares | 104,467 | - footnote F1 | - | |
| Johannes Jacob Pieter Kastelein - Officer | Open-market sale | Ordinary Shares | 104,467 | $30.30 footnote F3 | $3.17M | |
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Ordinary Shares | 94,124 | - footnote F1 | - | |
| Johannes Jacob Pieter Kastelein - Officer | Open-market sale | Ordinary Shares | 94,124 | $30.32 footnote F4 | $2.85M | |
| Johannes Jacob Pieter Kastelein - Officer | Option exercise | Ordinary Shares | 101,409 | - footnote F1 | - | |
| Johannes Jacob Pieter Kastelein - Officer | Open-market sale | Ordinary Shares | 101,409 | $30.29 footnote F5 | $3.07M | |
| ||||||
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 443,707 | $33.25 | $14.75M | |
| Michael H. Davidson - Officer | Option exercise | Ordinary Shares | 443,707 | - footnote F1 | - | |
| Michael H. Davidson - Officer | Option exercise | Option (right to buy) | 443,707 | $0.00 | - | |
| ||||||
| Michael H. Davidson - Officer | Option exercise | Ordinary Shares | 64,708 | - footnote F1 | - | |
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 61,547 | $36.13 footnote F2 | $2.22M | |
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 3,161 | $36.46 footnote F3 | $115K | |
| Michael H. Davidson - Officer | Option exercise | Ordinary Shares | 58,253 | - footnote F1 | - | |
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 46,517 | $35.11 footnote F4 | $1.63M | |
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 10,436 | $35.96 footnote F5 | $375K | |
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 1,300 | $36.68 footnote F6 | $48K | |
| Michael H. Davidson - Officer | Option exercise | Ordinary Shares | 183,332 | - footnote F1 | - | |
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 165,408 | $33.63 footnote F7 | $5.56M | |
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 17,924 | $34.44 footnote F8 | $617K | |
| Michael H. Davidson - Officer | Option exercise | Option (right to buy) | 64,708 | $0.00 | - | |
| Michael H. Davidson - Officer | Option exercise | Option (right to buy) | 58,253 | $0.00 | - | |
| Michael H. Davidson - Officer | Option exercise | Option (right to buy) | 183,332 | $0.00 | - | |
| ||||||
| Johannes Jacob Pieter Kastelein - Officer | Open-market sale | Ordinary Shares | 14,692 | $35.00 footnote F1 | $514K | |
| Johannes Jacob Pieter Kastelein - Officer | Open-market sale | Ordinary Shares | 30,789 | $35.46 footnote F2 | $1.09M | |
| ||||||
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 39,816 | $10.90 | $434K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 39,816 | $32.62 footnote F1 | $1.30M | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 32,612 | $10.90 | $355K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 32,612 | $31.80 footnote F2 | $1.04M | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 39,816 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 32,612 | $0.00 | - | |
| ||||||
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 38,172 | $10.90 | $416K | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 34,400 | $10.90 | $375K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 25,405 | $33.44 footnote F1 | $850K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 12,767 | $34.37 footnote F2 | $439K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 34,091 | $32.77 footnote F3 | $1.12M | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 309 | $33.45 footnote F4 | $10K | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 38,172 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 34,400 | $0.00 | - | |
| ||||||
 Mayur Ian Somaiya - Officer | Option exercise | Ordinary Shares | 60,216 | $9.26 | $558K | |
| Mayur Ian Somaiya - Officer | Option exercise | Ordinary Shares | 39,784 | $9.26 | $368K | |
| Mayur Ian Somaiya - Officer | Open-market sale | Ordinary Shares | 900 | $30.64 footnote F2 | $28K | |
| Mayur Ian Somaiya - Officer | Open-market sale | Ordinary Shares | 39,712 | $31.78 footnote F3 | $1.26M | |
| Mayur Ian Somaiya - Officer | Open-market sale | Ordinary Shares | 19,604 | $32.38 footnote F4 | $635K | |
| Mayur Ian Somaiya - Officer | Open-market sale | Ordinary Shares | 15,422 | $33.25 footnote F5 | $513K | |
| Mayur Ian Somaiya - Officer | Open-market sale | Ordinary Shares | 24,362 | $33.80 footnote F6 | $823K | |
| Mayur Ian Somaiya - Officer | Option exercise | Option (Right to Buy) | 60,216 | $0.00 | - | |
| Mayur Ian Somaiya - Officer | Option exercise | Option (Right to Buy) | 39,784 | $0.00 | - | |
| ||||||
| der Kamp Hilde Johanna van | Grant or award | Ordinary Shares | 3,400 footnote F1 | - footnote F2 | - | |
| der Kamp Hilde Johanna van | Grant or award | Option (right to buy) | 15,300 | $0.00 | - | |
| ||||||
 Adele M. Gulfo | Grant or award | Ordinary Shares | 3,400 footnote F1 | - footnote F2 | - | |
| Adele M. Gulfo | Grant or award | Option (right to buy) | 15,300 | $0.00 | - | |
| ||||||
| Michael H. Davidson - Officer | Open-market sale | Ordinary Shares | 11,582 | - footnote F2 | - | |
| Michael H. Davidson - Officer | Grant or award | Ordinary Shares | 81,000 footnote F3 | - footnote F4 | - | |
| Michael H. Davidson - Officer | Grant or award | Option (right to buy) | 364,000 | $0.00 | - | |
| ||||||
 William Lewis | Grant or award | Ordinary Shares | 3,400 footnote F1 | - footnote F2 | - | |
| William Lewis | Grant or award | Option (right to buy) | 15,300 | $0.00 | - | |
| ||||||
| John W. Smither | Grant or award | Ordinary Shares | 3,400 footnote F1 | - footnote F2 | - | |
| John W. Smither | Grant or award | Option (right to buy) | 15,300 | $0.00 | - | |
| ||||||
| Mark C. McKenna | Grant or award | Ordinary Shares | 3,400 footnote F1 | - footnote F2 | - | |
| Mark C. McKenna | Grant or award | Option (right to buy) | 15,300 | $0.00 | - | |
| ||||||
| Louis G. Lange | Grant or award | Ordinary Shares | 3,400 footnote F1 | - footnote F2 | - | |
| Louis G. Lange | Grant or award | Option (right to buy) | 15,300 | $0.00 | - | |
| ||||||
| Johannes Jacob Pieter Kastelein - Officer | Open-market sale | Ordinary Shares | 6,000 | $33.25 | $200K | |
| Johannes Jacob Pieter Kastelein - Officer | Grant or award | Ordinary Shares | 25,500 | - | - | |
| Johannes Jacob Pieter Kastelein - Officer | Grant or award | Option (right to buy) | 115,000 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 2,647 | $33.25 | $88K | |
| Louise Frederika Kooij - Officer | Grant or award | Ordinary Shares | 12,000 | - | - | |
| Louise Frederika Kooij - Officer | Grant or award | Option (right to buy) | 53,500 | $0.00 | - | |
| Mayur Ian Somaiya - Officer | Open-market sale | Ordinary Shares | 5,118 | $33.25 | $170K | |
| Mayur Ian Somaiya - Officer | Grant or award | Ordinary Shares | 25,500 | - | - | |
| Mayur Ian Somaiya - Officer | Grant or award | Option (right to buy) | 115,000 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 75,117 | $10.00 | $751K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 75,117 | $36.21 footnote F1 | $2.72M | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 26,011 | $10.00 | $260K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 26,011 | $35.68 footnote F2 | $928K | |
| Louise Frederika Kooij - Officer | Open-market sale | Ordinary Shares | 43,872 | $35.30 footnote F3 | $1.55M | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 38,872 | $10.00 | $389K | |
| Louise Frederika Kooij - Officer | Option exercise | Ordinary Shares | 5,000 | $10.90 | $55K | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 75,117 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 26,011 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 38,872 | $0.00 | - | |
| Louise Frederika Kooij - Officer | Option exercise | Option (right to buy) | 5,000 | $0.00 | - | |
| ||||||
 James N. Topper | Open-market purchase | Ordinary Shares | 660 | $23.70 | $16K | |
| James N. Topper | Open-market purchase | Ordinary Shares | 1,260 | $24.99 | $31K | |
Item 8.01, 9.01
Item 8.01
Item 5.02
Item 5.02
Recent NAMS Form 144 notices of proposed sale
3An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| Kastelein Johannes Jacob Pieter | Affiliate | 250,000 | $6.97M | View on EDGAR | |
| Kastelein Johannes Jacob Pieter | Affiliate | 125,000 |
NAMS insider trading FAQ
What is the latest insider trade for NAMS?
NewAmsterdam Pharma Co N.V. (NAMS) had 6 insider filings in the last 90 days, with the most recent on 2026-10-02. The full record for NAMS runs to 51 Form 4 filings, the earliest from 2024-10-01. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying NAMS stock?
1 insider purchase of NAMS was filed in the last 90 days, totaling $226K.
How many insiders are selling NAMS stock?
6 insider sales of NAMS were filed in the last 90 days, totaling $7.85M.
Where can I see NAMS SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects NAMS Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Health Care companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Johannes Jacob Pieter Kastelein view on EDGAR
- - Michael H. Davidson view on EDGAR
- - John W. Smither view on EDGAR
- - Robert William Gunning view on EDGAR
- - Johannes Jacob Pieter Kastelein view on EDGAR
- - Louise Frederika Kooij view on EDGAR
- - Louise Frederika Kooij view on EDGAR
- - Louise Frederika Kooij view on EDGAR
- - Louis G. Lange view on EDGAR
Related companies with recent insider activity
Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Health Care
- Where NAMS's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
Follow NAMS with a 7-day demo
- NAMS on your watchlist
- Every NAMS Form 4 filing on record
- Up to 3 months of NAMS price history
- The daily trading plan of ranked insider buys, on a delay, with the plan archive
Start 7-day demoCard required. Your card is never charged for the demo.
