Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sale 10b5-1
- Shares
- 50,246
- Price
- $25.03
- Value
- $1,257,657
SEC EDGAR · Forms 3/4/5Updated through Oct 30, 2026•37 filings
NAMS
NewAmsterdam Pharma Co N.V.
Net sales of $4.4M over the last 3 months
1 seller account for the net balance. There is no cluster of three distinct buyers within 30 days. We found 1 CEO/CFO purchases over 12 months.
How to read this signal
Only open-market P purchases and S sales count toward the signal. Vesting, options, taxes and gifts remain in the source data but do not trigger alerts. Rule 10b5-1 trades are shown as informational.
3-month balance
−$4,394,907
1 buyers · 1 sellers
12-month purchases
$226,500
1 distinct insiders
12-month sales
$62,755,529
5 distinct insiders
Highlighted alerts
17
32 Rule 10b5-1 trades treated as informational
Buying cluster · 30 days
Fewer than three distinct buyers
CEO/CFO purchases · 12 months
1 executive purchases found
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Form 4 raw → Raspberry
The value is in what we do not call a signal.
The SEC XML stores every transaction. Raspberry keeps that evidence, reads the footnotes and separates voluntary open-market activity from vesting, option exercises, gifts, tax withholding, stock purchase and dividend reinvestment plans and pre-programmed 10b5-1 trades.
100
Raw transactions
Everything returned by the filing
49
Voluntary view
P/S trades after deterministic checks
62
Administrative noise
Stored, never alerted
74
10b5-1
Shown as informational
SEC ownership XML facts
- Code
- S
- Shares
- 1,600
- Price
- $25.32
- Footnotes
- 3
Reported transaction reflects a sale of ordinary shares to generate proceeds to satisfy the Reporting Person's tax obligations in connection with the prior vesting of restricted stock units. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $25.24 to $25.37 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction. Includes 8,040 ordinary shares subject to restricted stock unit awards that remain subject to vesting.
Raspberry interpretation
Informational — no alert
Reason: tax_withholding. The filing footnotes identify tax withholding.
Recent transactions
Voluntary purchases and sales; administrative noise stays hidden.
Davidson Michael H.
Chief Executive Officer
PurchaseAlert
- Shares
- 10,000
- Price
- $22.65
- Value
- $226,500
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sale 10b5-1
- Shares
- 125,000
- Price
- $26.91
- Value
- $3,363,750
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 2,915
- Price
- $31.71
- Value
- $92,435
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 31,885
- Price
- $31.05
- Value
- $990,029
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 70,200
- Price
- $29.96
- Value
- $2,103,192
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 300
- Price
- $30.73
- Value
- $9,219
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 39,700
- Price
- $30.20
- Value
- $1,198,940
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 65,000
- Price
- $35.69
- Value
- $2,319,850
LANGE LOUIS G
Director
SaleAlert
- Shares
- 446
- Price
- $31.23
- Value
- $13,929
LANGE LOUIS G
Director
SaleAlert
- Shares
- 44,173
- Price
- $30.41
- Value
- $1,343,301
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sale 10b5-1
- Shares
- 101,409
- Price
- $30.29
- Value
- $3,071,679
LANGE LOUIS G
Director
SaleAlert
- Shares
- 28,186
- Price
- $29.41
- Value
- $828,950
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sale 10b5-1
- Shares
- 94,124
- Price
- $30.32
- Value
- $2,853,840
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
Sale 10b5-1
- Shares
- 104,467
- Price
- $30.30
- Value
- $3,165,350
Davidson Michael H.
Chief Executive Officer
SaleAlert
- Shares
- 443,707
- Price
- $33.25
- Value
- $14,753,258
Davidson Michael H.
Chief Executive Officer
Sale 10b5-1
- Shares
- 17,924
- Price
- $34.44
- Value
- $617,303
Davidson Michael H.
Chief Executive Officer
Sale 10b5-1
- Shares
- 165,408
- Price
- $33.63
- Value
- $5,562,671
Davidson Michael H.
Chief Executive Officer
Sale 10b5-1
- Shares
- 1,300
- Price
- $36.68
- Value
- $47,684
Davidson Michael H.
Chief Executive Officer
Sale 10b5-1
- Shares
- 10,436
- Price
- $35.96
- Value
- $375,279
Davidson Michael H.
Chief Executive Officer
Sale 10b5-1
- Shares
- 46,517
- Price
- $35.11
- Value
- $1,633,212
Davidson Michael H.
Chief Executive Officer
Sale 10b5-1
- Shares
- 3,161
- Price
- $36.46
- Value
- $115,250
Davidson Michael H.
Chief Executive Officer
Sale 10b5-1
- Shares
- 61,547
- Price
- $36.13
- Value
- $2,223,693
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
SaleAlert
- Shares
- 30,789
- Price
- $35.46
- Value
- $1,091,778
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
SaleAlert
- Shares
- 14,692
- Price
- $35.00
- Value
- $514,220
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 32,612
- Price
- $31.80
- Value
- $1,037,062
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 39,816
- Price
- $32.62
- Value
- $1,298,798
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 309
- Price
- $33.45
- Value
- $10,336
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 34,091
- Price
- $32.77
- Value
- $1,117,162
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 12,767
- Price
- $34.37
- Value
- $438,802
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 25,405
- Price
- $33.44
- Value
- $849,543
Somaiya Mayur Ian
Chief Financial Officer
Sale 10b5-1
- Shares
- 24,362
- Price
- $33.80
- Value
- $823,436
Somaiya Mayur Ian
Chief Financial Officer
Sale 10b5-1
- Shares
- 15,422
- Price
- $33.25
- Value
- $512,782
Somaiya Mayur Ian
Chief Financial Officer
Sale 10b5-1
- Shares
- 19,604
- Price
- $32.38
- Value
- $634,778
Somaiya Mayur Ian
Chief Financial Officer
Sale 10b5-1
- Shares
- 39,712
- Price
- $31.78
- Value
- $1,262,047
Somaiya Mayur Ian
Chief Financial Officer
Sale 10b5-1
- Shares
- 900
- Price
- $30.64
- Value
- $27,576
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 43,872
- Price
- $35.30
- Value
- $1,548,682
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 26,011
- Price
- $35.68
- Value
- $928,072
Kooij Louise Frederika
Chief Accounting Officer
Sale 10b5-1
- Shares
- 75,117
- Price
- $36.21
- Value
- $2,719,987
Topper James N
Director
PurchaseAlert
- Shares
- 660
- Price
- $23.70
- Value
- $15,639
Kooij Louise Frederika
Chief Accounting Officer
SaleAlert
- Shares
- 96,896
- Price
- $26.11
- Value
- $2,529,955
Kooij Louise Frederika
Chief Accounting Officer
SaleAlert
- Shares
- 53,104
- Price
- $25.31
- Value
- $1,344,062
Topper James N
Director
PurchaseAlert
- Shares
- 1,260
- Price
- $24.99
- Value
- $31,487
Kooij Louise Frederika
Chief Accounting Officer
SaleAlert
- Shares
- 18,073
- Price
- $25.09
- Value
- $453,452
Kooij Louise Frederika
Chief Accounting Officer
SaleAlert
- Shares
- 8,269
- Price
- $24.86
- Value
- $205,567
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
SaleAlert
- Shares
- 7,658
- Price
- $25.49
- Value
- $195,202
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
SaleAlert
- Shares
- 42,342
- Price
- $25.08
- Value
- $1,061,937
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
SaleAlert
- Shares
- 50,000
- Price
- $24.29
- Value
- $1,214,500
Topper James N
Director
PurchaseAlert
- Shares
- 471
- Price
- $23.98
- Value
- $11,294
| Date | Insider | Transaction | Shares | Price | Value | Reading |
|---|---|---|---|---|---|---|
| Sep 30, 2026 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 50,246 | $25.03 | $1,257,657 | |
| Sep 14, 2026 | Davidson Michael H. Chief Executive Officer | Purchase | 10,000 | $22.65 | $226,500 | |
| Aug 24, 2026 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 125,000 | $26.91 | $3,363,750 | |
| Jul 20, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 2,915 | $31.71 | $92,435 | |
| Jul 20, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 31,885 | $31.05 | $990,029 | |
| Jul 20, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 70,200 | $29.96 | $2,103,192 | |
| Jun 22, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 300 | $30.73 | $9,219 | |
| Jun 22, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 39,700 | $30.20 | $1,198,940 | |
| May 26, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 65,000 | $35.69 | $2,319,850 | |
| Mar 11, 2026 | LANGE LOUIS G Director | Sale | 446 | $31.23 | $13,929 | |
| Mar 11, 2026 | LANGE LOUIS G Director | Sale | 44,173 | $30.41 | $1,343,301 | |
| Mar 09, 2026 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 101,409 | $30.29 | $3,071,679 | |
| Mar 06, 2026 | LANGE LOUIS G Director | Sale | 28,186 | $29.41 | $828,950 | |
| Mar 06, 2026 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 94,124 | $30.32 | $2,853,840 | |
| Mar 05, 2026 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 104,467 | $30.30 | $3,165,350 | |
| Mar 02, 2026 | Davidson Michael H. Chief Executive Officer | Sale | 443,707 | $33.25 | $14,753,258 | |
| Feb 26, 2026 | Davidson Michael H. Chief Executive Officer | Sale | 17,924 | $34.44 | $617,303 | |
| Feb 26, 2026 | Davidson Michael H. Chief Executive Officer | Sale | 165,408 | $33.63 | $5,562,671 | |
| Feb 25, 2026 | Davidson Michael H. Chief Executive Officer | Sale | 1,300 | $36.68 | $47,684 | |
| Feb 25, 2026 | Davidson Michael H. Chief Executive Officer | Sale | 10,436 | $35.96 | $375,279 | |
| Feb 25, 2026 | Davidson Michael H. Chief Executive Officer | Sale | 46,517 | $35.11 | $1,633,212 | |
| Feb 24, 2026 | Davidson Michael H. Chief Executive Officer | Sale | 3,161 | $36.46 | $115,250 | |
| Feb 24, 2026 | Davidson Michael H. Chief Executive Officer | Sale | 61,547 | $36.13 | $2,223,693 | |
| Feb 20, 2026 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 30,789 | $35.46 | $1,091,778 | |
| Feb 20, 2026 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 14,692 | $35.00 | $514,220 | |
| Jan 28, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 32,612 | $31.80 | $1,037,062 | |
| Jan 27, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 39,816 | $32.62 | $1,298,798 | |
| Jan 26, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 309 | $33.45 | $10,336 | |
| Jan 26, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 34,091 | $32.77 | $1,117,162 | |
| Jan 23, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 12,767 | $34.37 | $438,802 | |
| Jan 23, 2026 | Kooij Louise Frederika Chief Accounting Officer | Sale | 25,405 | $33.44 | $849,543 | |
| Jan 21, 2026 | Somaiya Mayur Ian Chief Financial Officer | Sale | 24,362 | $33.80 | $823,436 | |
| Jan 21, 2026 | Somaiya Mayur Ian Chief Financial Officer | Sale | 15,422 | $33.25 | $512,782 | |
| Jan 20, 2026 | Somaiya Mayur Ian Chief Financial Officer | Sale | 19,604 | $32.38 | $634,778 | |
| Jan 20, 2026 | Somaiya Mayur Ian Chief Financial Officer | Sale | 39,712 | $31.78 | $1,262,047 | |
| Jan 20, 2026 | Somaiya Mayur Ian Chief Financial Officer | Sale | 900 | $30.64 | $27,576 | |
| Dec 26, 2025 | Kooij Louise Frederika Chief Accounting Officer | Sale | 43,872 | $35.30 | $1,548,682 | |
| Dec 24, 2025 | Kooij Louise Frederika Chief Accounting Officer | Sale | 26,011 | $35.68 | $928,072 | |
| Dec 23, 2025 | Kooij Louise Frederika Chief Accounting Officer | Sale | 75,117 | $36.21 | $2,719,987 | |
| Sep 15, 2025 | Topper James N Director | Purchase | 660 | $23.70 | $15,639 | |
| Sep 09, 2025 | Kooij Louise Frederika Chief Accounting Officer | Sale | 96,896 | $26.11 | $2,529,955 | |
| Sep 09, 2025 | Kooij Louise Frederika Chief Accounting Officer | Sale | 53,104 | $25.31 | $1,344,062 | |
| Sep 08, 2025 | Topper James N Director | Purchase | 1,260 | $24.99 | $31,487 | |
| Sep 03, 2025 | Kooij Louise Frederika Chief Accounting Officer | Sale | 18,073 | $25.09 | $453,452 | |
| Aug 25, 2025 | Kooij Louise Frederika Chief Accounting Officer | Sale | 8,269 | $24.86 | $205,567 | |
| Aug 22, 2025 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 7,658 | $25.49 | $195,202 | |
| Aug 22, 2025 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 42,342 | $25.08 | $1,061,937 | |
| Aug 21, 2025 | Kastelein Johannes Jacob Pieter Chief Scientific Officer | Sale | 50,000 | $24.29 | $1,214,500 | |
| Aug 11, 2025 | Topper James N Director | Purchase | 471 | $23.98 | $11,294 |
“Alert” means a voluntary, unscheduled transaction according to the filing; it is not an investment recommendation. Official source: SEC EDGAR.