Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exercise
Calculated transaction value
$0
50,246 shares @ $0
Traded
Sep 30, 2026
Filed
Oct 2, 2026
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NewAmsterdam Pharma Company N
NAMS
ManufacturingChemicals
Transactions reported in official disclosures
Price with disclosed trades
Daily closes, past year · marks sit on transaction dates, sized by value
23 trades
| Reporting person | Filed | Transaction | Transaction value | Source | Actions |
|---|---|---|---|---|---|
| Kastelein Johannes Jacob Pi... Chief Scientific Officer | Oct 2, 2026 2-day lag | Exercise Sep 30, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Kastelein Johannes Jacob Pi... Chief Scientific Officer | Oct 2, 2026 2-day lag | Exercise Sep 30, 2026 | Not reported Reported range | SEC Form 4 View filing | |
| Kastelein Johannes Jacob Pi... Chief Scientific Officer | Oct 2, 2026 2-day lag | Sale Sep 30, 2026 | $1.26M Filed shares x price | SEC Form 4 View filing | |
| Davidson Michael H. Chief Executive Officer | Sep 15, 2026 1-day lag | Buy Sep 14, 2026 | $226.5K Filed shares x price | SEC Form 4 View filing | |
| Smither John W Director | Sep 9, 2026 5-day lag | Sale Sep 4, 2026 | $40.51K Filed shares x price | SEC Form 4 View filing | |
| Gunning Robert William Vice President, Controller | Sep 3, 2026 2-day lag | Award Sep 1, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Gunning Robert William Vice President, Controller | Sep 3, 2026 2-day lag | Award Sep 1, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Kastelein Johannes Jacob Pi... Chief Scientific Officer | Aug 25, 2026 1-day lag | Exercise Aug 24, 2026 | Not reported Reported range | SEC Form 4 View filing | |
| Kastelein Johannes Jacob Pi... Chief Scientific Officer | Aug 25, 2026 1-day lag | Exercise Aug 24, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Kastelein Johannes Jacob Pi... Chief Scientific Officer | Aug 25, 2026 1-day lag | Sale Aug 24, 2026 | $3.36M Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jul 22, 2026 2-day lag | Exercise Jul 20, 2026 | $297.5K Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jul 22, 2026 2-day lag | Sale Jul 20, 2026 | $990.03K Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jul 22, 2026 2-day lag | Exercise Jul 20, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jul 22, 2026 2-day lag | Exercise Jul 20, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jul 22, 2026 2-day lag | Exercise Jul 20, 2026 | $893.6K Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jul 22, 2026 2-day lag | Sale Jul 20, 2026 | $92.43K Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jul 22, 2026 2-day lag | Sale Jul 20, 2026 | $2.1M Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jun 24, 2026 2-day lag | Sale Jun 22, 2026 | $9.22K Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jun 24, 2026 2-day lag | Sale Jun 22, 2026 | $1.2M Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jun 24, 2026 2-day lag | Exercise Jun 22, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jun 24, 2026 2-day lag | Exercise Jun 22, 2026 | $178.5K Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jun 24, 2026 2-day lag | Exercise Jun 22, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Kooij Louise Frederika Chief Accounting Officer | Jun 24, 2026 2-day lag | Exercise Jun 22, 2026 | $272.5K Filed shares x price | SEC Form 4 View filing |
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exercise
Reported value range
Not reported
50,246 shares
Traded
Sep 30, 2026
Filed
Oct 2, 2026
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sale
Calculated transaction value
$1.26M
50,246 shares @ $25.03
Traded
Sep 30, 2026
Filed
Oct 2, 2026
Davidson Michael H.
Chief Executive Officer
Buy
Calculated transaction value
$226.5K
10,000 shares @ $22.65
Traded
Sep 14, 2026
Filed
Sep 15, 2026
Smither John W
Director
Sale
Calculated transaction value
$40.51K
1,600 shares @ $25.32
Traded
Sep 4, 2026
Filed
Sep 9, 2026
Gunning Robert William
Vice President, Controller
Award
Calculated transaction value
$0
3,200 shares @ $0
Traded
Sep 1, 2026
Filed
Sep 3, 2026
Gunning Robert William
Vice President, Controller
Award
Calculated transaction value
$0
14,000 shares @ $0
Traded
Sep 1, 2026
Filed
Sep 3, 2026
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exercise
Reported value range
Not reported
125,000 shares
Traded
Aug 24, 2026
Filed
Aug 25, 2026
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Exercise
Calculated transaction value
$0
125,000 shares @ $0
Traded
Aug 24, 2026
Filed
Aug 25, 2026
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sale
Calculated transaction value
$3.36M
125,000 shares @ $26.91
Traded
Aug 24, 2026
Filed
Aug 25, 2026
Kooij Louise Frederika
Chief Accounting Officer
Exercise
Calculated transaction value
$297.5K
25,000 shares @ $11.9
Traded
Jul 20, 2026
Filed
Jul 22, 2026
Kooij Louise Frederika
Chief Accounting Officer
Sale
Calculated transaction value
$990.03K
31,885 shares @ $31.05
Traded
Jul 20, 2026
Filed
Jul 22, 2026
Kooij Louise Frederika
Chief Accounting Officer
Exercise
Calculated transaction value
$0
25,000 shares @ $0
Traded
Jul 20, 2026
Filed
Jul 22, 2026
Kooij Louise Frederika
Chief Accounting Officer
Exercise
Calculated transaction value
$0
80,000 shares @ $0
Traded
Jul 20, 2026
Filed
Jul 22, 2026
Kooij Louise Frederika
Chief Accounting Officer
Exercise
Calculated transaction value
$893.6K
80,000 shares @ $11.17
Traded
Jul 20, 2026
Filed
Jul 22, 2026
Kooij Louise Frederika
Chief Accounting Officer
Sale
Calculated transaction value
$92.43K
2,915 shares @ $31.71
Traded
Jul 20, 2026
Filed
Jul 22, 2026
Kooij Louise Frederika
Chief Accounting Officer
Sale
Calculated transaction value
$2.1M
70,200 shares @ $29.96
Traded
Jul 20, 2026
Filed
Jul 22, 2026
Kooij Louise Frederika
Chief Accounting Officer
Sale
Calculated transaction value
$9.22K
300 shares @ $30.73
Traded
Jun 22, 2026
Filed
Jun 24, 2026
Kooij Louise Frederika
Chief Accounting Officer
Sale
Calculated transaction value
$1.2M
39,700 shares @ $30.2
Traded
Jun 22, 2026
Filed
Jun 24, 2026
Kooij Louise Frederika
Chief Accounting Officer
Exercise
Calculated transaction value
$0
15,000 shares @ $0
Traded
Jun 22, 2026
Filed
Jun 24, 2026
Kooij Louise Frederika
Chief Accounting Officer
Exercise
Calculated transaction value
$178.5K
15,000 shares @ $11.9
Traded
Jun 22, 2026
Filed
Jun 24, 2026
Kooij Louise Frederika
Chief Accounting Officer
Exercise
Calculated transaction value
$0
25,000 shares @ $0
Traded
Jun 22, 2026
Filed
Jun 24, 2026
Kooij Louise Frederika
Chief Accounting Officer
Exercise
Calculated transaction value
$272.5K
25,000 shares @ $10.9
Traded
Jun 22, 2026
Filed
Jun 24, 2026