NAMS
insider transactionsNewAmsterdam Pharma Co N.V. — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
Net shares · 365d
-2.0M
6.2K buy · 2.0M sell
Net value · 365d
-$63.2M
$127.9K in · $63.3M out
Sentiment · 365d
Net selling
0% buying · 100% selling
Open-market trades · 365d
50
6.2K buy · 2.0M sell
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
5.0K sh
Own +8%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
60.0K sh
Own +300%
-
Sell·S
Chief Accounting Officer · 10b5-1
$2.3M
65.0K sh · $35.69
Own -73%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$54.5K
5.0K sh · $10.90
Own +6%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$600.0K
60.0K sh · $10.00
Own +246%
-
Sell·S
Director
$1.3M
44.2K sh · $30.41
Own -80%
-
Sell·S
Director
$13.9K
446 sh · $31.23
Own -4%
-
Exercise·M
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
$0
101.4K sh
Own +24%
-
Exercise·M
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
—
101.4K sh
Own +146%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
$3.1M
101.4K sh · $30.29
Own -59%
-
Exercise·X
Director
$0
44.6K sh
Own New
-
Exercise·X
Director
$513.1K
44.6K sh · $11.50
Own +431%
-
Exercise·M
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
$0
94.1K sh
Own +18%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
$2.9M
94.1K sh · $30.32
Own -58%
-
Exercise·M
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
—
94.1K sh
Own +136%
-
Sell·S
Director
$829.0K
28.2K sh · $29.41
Own -100%
-
Exercise·M
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
$0
104.5K sh
Own +17%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
$3.2M
104.5K sh · $30.30
Own -60%
-
Exercise·M
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
—
104.5K sh
Own +151%
-
Exercise·M
Chief Executive Officer
$0
443.7K sh
Own New
-
Exercise·M
Chief Executive Officer
—
443.7K sh
Own +255%
-
Sell·S
Chief Executive Officer
$14.8M
443.7K sh · $33.25
Own -72%
-
Exercise·M
Chief Executive Officer · 10b5-1
$0
183.3K sh
Own +37%
-
Sell·S
Chief Executive Officer · 10b5-1
$617.3K
17.9K sh · $34.44
Own -9%
-
Sell·S
Chief Executive Officer · 10b5-1
$5.6M
165.4K sh · $33.63
Own -26%
-
Exercise·M
Chief Executive Officer · 10b5-1
—
183.3K sh
Own +40%
-
Exercise·M
Chief Executive Officer · 10b5-1
$0
58.3K sh
Own +7%
-
Sell·S
Chief Executive Officer · 10b5-1
$47.7K
1.3K sh · $36.68
Own -0%
-
Sell·S
Chief Executive Officer · 10b5-1
$375.3K
10.4K sh · $35.96
Own -2%
-
Sell·S
Chief Executive Officer · 10b5-1
$1.6M
46.5K sh · $35.11
Own -9%
-
Exercise·M
Chief Executive Officer · 10b5-1
—
58.3K sh
Own +13%
-
Exercise·M
Chief Executive Officer · 10b5-1
$0
64.7K sh
Own +8%
-
Sell·S
Chief Executive Officer · 10b5-1
$115.3K
3.2K sh · $36.46
Own -1%
-
Sell·S
Chief Executive Officer · 10b5-1
$2.2M
61.5K sh · $36.13
Own -12%
-
Exercise·M
Chief Executive Officer · 10b5-1
—
64.7K sh
Own +14%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
$514.2K
14.7K sh · $35.00
Own -15%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
$1.1M
30.8K sh · $35.46
Own -37%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
32.6K sh
Own +80%
-
Sell·S
Chief Accounting Officer · 10b5-1
$1.0M
32.6K sh · $31.80
Own -57%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$355.5K
32.6K sh · $10.90
Own +134%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
39.8K sh
Own +60%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$434.0K
39.8K sh · $10.90
Own +163%
-
Sell·S
Chief Accounting Officer · 10b5-1
$1.3M
39.8K sh · $32.62
Own -62%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
34.4K sh
Own +31%
-
Sell·S
Chief Accounting Officer · 10b5-1
$10.3K
309 sh · $33.45
Own -1%
-
Sell·S
Chief Accounting Officer · 10b5-1
$1.1M
34.1K sh · $32.77
Own -58%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$375.0K
34.4K sh · $10.90
Own +141%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
38.2K sh
Own +27%
-
Sell·S
Chief Accounting Officer · 10b5-1
$438.8K
12.8K sh · $34.37
Own -34%
-
Sell·S
Chief Accounting Officer · 10b5-1
$849.5K
25.4K sh · $33.44
Own -41%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$416.1K
38.2K sh · $10.90
Own +157%
-
Exercise·M
Chief Financial Officer · 10b5-1
$0
39.8K sh
Own +6%
-
Exercise·M
Chief Financial Officer · 10b5-1
$368.4K
39.8K sh · $9.26
Own +68%
-
Sell·S
Chief Financial Officer · 10b5-1
$512.8K
15.4K sh · $33.25
Own -16%
-
Sell·S
Chief Financial Officer · 10b5-1
$823.4K
24.4K sh · $33.80
Own -29%
-
Exercise·M
Chief Financial Officer · 10b5-1
$0
60.2K sh
Own +9%
-
Sell·S
Chief Financial Officer · 10b5-1
$27.6K
900 sh · $30.64
Own -1%
-
Sell·S
Chief Financial Officer · 10b5-1
$1.3M
39.7K sh · $31.78
Own -34%
-
Sell·S
Chief Financial Officer · 10b5-1
$634.8K
19.6K sh · $32.38
Own -25%
-
Exercise·M
Chief Financial Officer · 10b5-1
$557.6K
60.2K sh · $9.26
Own +103%
-
Grant·A
Chief Accounting Officer · 10b5-1
$0
53.5K sh
Own New
-
Grant·A
Chief Accounting Officer · 10b5-1
—
12.0K sh
Own +97%
-
Grant·A
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
$0
115.0K sh
Own New
-
Grant·A
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
—
25.5K sh
Own +35%
-
Grant·A
Chief Financial Officer · 10b5-1
$0
115.0K sh
Own New
-
Grant·A
Chief Financial Officer · 10b5-1
—
25.5K sh
Own +78%
-
Grant·A
Director
$0
15.3K sh
Own New
-
Grant·A
Director
—
3.4K sh
Own +49%
-
Grant·A
Director
$0
15.3K sh
Own New
-
Grant·A
Director
—
3.4K sh
Own +49%
-
Grant·A
Director
$0
15.3K sh
Own New
-
Grant·A
Director
—
3.4K sh
Own +49%
-
Grant·A
Director
$0
15.3K sh
Own New
-
Grant·A
Director
—
3.4K sh
Own +49%
-
Grant·A
Director
$0
15.3K sh
Own New
-
Grant·A
Director
—
3.4K sh
Own +31%
-
Grant·A
Chief Executive Officer · 10b5-1
$0
364.0K sh
Own New
-
Sell·S
Chief Executive Officer · 10b5-1
—
11.6K sh
Own -3%
-
Grant·A
Chief Executive Officer · 10b5-1
—
81.0K sh
Own +21%
-
Grant·A
Director
$0
15.3K sh
Own New
-
Grant·A
Director
—
3.4K sh
Own +49%
-
Sell·S
Chief Accounting Officer · 10b5-1
$88.0K
2.6K sh · $33.25
Own -18%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer · 10b5-1
$199.5K
6.0K sh · $33.25
Own -8%
-
Sell·S
Chief Financial Officer · 10b5-1
$170.2K
5.1K sh · $33.25
Own -13%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
38.9K sh
Own +38%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
5.0K sh
Own +2%
-
Sell·S
Chief Accounting Officer · 10b5-1
$1.5M
43.9K sh · $35.30
Own -75%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$54.5K
5.0K sh · $10.90
Own +9%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$388.7K
38.9K sh · $10.00
Own +259%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
26.0K sh
Own +17%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$260.1K
26.0K sh · $10.00
Own +173%
-
Sell·S
Chief Accounting Officer · 10b5-1
$928.1K
26.0K sh · $35.68
Own -63%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$0
75.1K sh
Own +58%
-
Exercise·M
Chief Accounting Officer · 10b5-1
$751.2K
75.1K sh · $10.00
Own +501%
-
Sell·S
Chief Accounting Officer · 10b5-1
$2.7M
75.1K sh · $36.21
Own -83%
-
Buy·P
Director
$15.6K
660 sh · $23.70
Own +0%
-
Exercise·M
Chief Accounting Officer
$0
150.0K sh
Own +115%
-
Sell·S
Chief Accounting Officer
$1.3M
53.1K sh · $25.31
Own -32%
-
Exercise·M
Chief Accounting Officer
$1.5M
150.0K sh · $10.00
Own +1000%
-
Sell·S
Chief Accounting Officer
$2.5M
96.9K sh · $26.11
Own -87%
-
Buy·P
Director
$31.5K
1.3K sh · $24.99
Own +0%
-
Sell·S
Chief Accounting Officer
$453.5K
18.1K sh · $25.09
Own -55%
-
Exercise·M
Chief Accounting Officer
$0
18.1K sh
Own New
-
Exercise·M
Chief Accounting Officer
—
18.1K sh
Own +120%
-
Sell·S
Chief Accounting Officer
$205.6K
8.3K sh · $24.86
Own -36%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
$1.1M
42.3K sh · $25.08
Own -35%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
$195.2K
7.7K sh · $25.49
Own -10%
-
Sell·S
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
$1.2M
50.0K sh · $24.29
Own -30%
-
Buy·P
Director
$11.3K
471 sh · $23.98
Own +0%
-
Exercise·M
Chief Operating Officer · 10b5-1
$0
51.0K sh
Own +46%
-
Sell·S
Chief Operating Officer · 10b5-1
$1.1M
51.0K sh · $21.10
Own -54%
-
Exercise·M
Chief Operating Officer · 10b5-1
$556.4K
51.0K sh · $10.90
Own +116%
-
Exercise·M
Chief Operating Officer · 10b5-1
$0
47.6K sh
Own +29%
-
Sell·S
Chief Operating Officer · 10b5-1
$78.4K
3.5K sh · $22.12
Own -7%
-
Sell·S
Chief Operating Officer · 10b5-1
$941.3K
44.0K sh · $21.38
Own -48%
-
Exercise·M
Chief Operating Officer · 10b5-1
$518.5K
47.6K sh · $10.90
Own +108%
-
Buy·P
Director
$23.0K
1.3K sh · $18.26
Own +0%
-
Buy·P
Director
$46.4K
2.5K sh · $18.43
Own +0%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| May 26, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 5.0K | $0 |
| May 26, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 60.0K | $0 |
| May 26, 2026 | Kooij Louise Frederika 10b5-1 | Sell S | 65.0K | $2.3M |
| May 26, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 5.0K | $54.5K |
| May 26, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 60.0K | $600.0K |
| Mar 11, 2026 | LANGE LOUIS G | Sell S | 44.2K | $1.3M |
| Mar 11, 2026 | LANGE LOUIS G | Sell S | 446 | $13.9K |
| Mar 9, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Exercise M | 101.4K | $0 |
| Mar 9, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Exercise M | 101.4K | — |
| Mar 9, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Sell S | 101.4K | $3.1M |
| Mar 9, 2026 | LANGE LOUIS G | Exercise X | 44.6K | $0 |
| Mar 9, 2026 | LANGE LOUIS G | Exercise X | 44.6K | $513.1K |
| Mar 6, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Exercise M | 94.1K | $0 |
| Mar 6, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Sell S | 94.1K | $2.9M |
| Mar 6, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Exercise M | 94.1K | — |
| Mar 6, 2026 | LANGE LOUIS G | Sell S | 28.2K | $829.0K |
| Mar 5, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Exercise M | 104.5K | $0 |
| Mar 5, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Sell S | 104.5K | $3.2M |
| Mar 5, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Exercise M | 104.5K | — |
| Mar 2, 2026 | Davidson Michael H. KEY | Exercise M | 443.7K | $0 |
| Mar 2, 2026 | Davidson Michael H. KEY | Exercise M | 443.7K | — |
| Mar 2, 2026 | Davidson Michael H. KEY | Sell S | 443.7K | $14.8M |
| Feb 26, 2026 | Davidson Michael H. KEY 10b5-1 | Exercise M | 183.3K | $0 |
| Feb 26, 2026 | Davidson Michael H. KEY 10b5-1 | Sell S | 17.9K | $617.3K |
| Feb 26, 2026 | Davidson Michael H. KEY 10b5-1 | Sell S | 165.4K | $5.6M |
| Feb 26, 2026 | Davidson Michael H. KEY 10b5-1 | Exercise M | 183.3K | — |
| Feb 25, 2026 | Davidson Michael H. KEY 10b5-1 | Exercise M | 58.3K | $0 |
| Feb 25, 2026 | Davidson Michael H. KEY 10b5-1 | Sell S | 1.3K | $47.7K |
| Feb 25, 2026 | Davidson Michael H. KEY 10b5-1 | Sell S | 10.4K | $375.3K |
| Feb 25, 2026 | Davidson Michael H. KEY 10b5-1 | Sell S | 46.5K | $1.6M |
| Feb 25, 2026 | Davidson Michael H. KEY 10b5-1 | Exercise M | 58.3K | — |
| Feb 24, 2026 | Davidson Michael H. KEY 10b5-1 | Exercise M | 64.7K | $0 |
| Feb 24, 2026 | Davidson Michael H. KEY 10b5-1 | Sell S | 3.2K | $115.3K |
| Feb 24, 2026 | Davidson Michael H. KEY 10b5-1 | Sell S | 61.5K | $2.2M |
| Feb 24, 2026 | Davidson Michael H. KEY 10b5-1 | Exercise M | 64.7K | — |
| Feb 20, 2026 | Kastelein Johannes Jacob Pieter | Sell S | 14.7K | $514.2K |
| Feb 20, 2026 | Kastelein Johannes Jacob Pieter | Sell S | 30.8K | $1.1M |
| Jan 28, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 32.6K | $0 |
| Jan 28, 2026 | Kooij Louise Frederika 10b5-1 | Sell S | 32.6K | $1.0M |
| Jan 28, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 32.6K | $355.5K |
| Jan 27, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 39.8K | $0 |
| Jan 27, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 39.8K | $434.0K |
| Jan 27, 2026 | Kooij Louise Frederika 10b5-1 | Sell S | 39.8K | $1.3M |
| Jan 26, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 34.4K | $0 |
| Jan 26, 2026 | Kooij Louise Frederika 10b5-1 | Sell S | 309 | $10.3K |
| Jan 26, 2026 | Kooij Louise Frederika 10b5-1 | Sell S | 34.1K | $1.1M |
| Jan 26, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 34.4K | $375.0K |
| Jan 23, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 38.2K | $0 |
| Jan 23, 2026 | Kooij Louise Frederika 10b5-1 | Sell S | 12.8K | $438.8K |
| Jan 23, 2026 | Kooij Louise Frederika 10b5-1 | Sell S | 25.4K | $849.5K |
| Jan 23, 2026 | Kooij Louise Frederika 10b5-1 | Exercise M | 38.2K | $416.1K |
| Jan 21, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Exercise M | 39.8K | $0 |
| Jan 21, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Exercise M | 39.8K | $368.4K |
| Jan 21, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Sell S | 15.4K | $512.8K |
| Jan 21, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Sell S | 24.4K | $823.4K |
| Jan 20, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Exercise M | 60.2K | $0 |
| Jan 20, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Sell S | 900 | $27.6K |
| Jan 20, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Sell S | 39.7K | $1.3M |
| Jan 20, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Sell S | 19.6K | $634.8K |
| Jan 20, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Exercise M | 60.2K | $557.6K |
| Jan 7, 2026 | Kooij Louise Frederika 10b5-1 | Grant A | 53.5K | $0 |
| Jan 7, 2026 | Kooij Louise Frederika 10b5-1 | Grant A | 12.0K | — |
| Jan 7, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Grant A | 115.0K | $0 |
| Jan 7, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Grant A | 25.5K | — |
| Jan 7, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Grant A | 115.0K | $0 |
| Jan 7, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Grant A | 25.5K | — |
| Jan 7, 2026 | LANGE LOUIS G | Grant A | 15.3K | $0 |
| Jan 7, 2026 | LANGE LOUIS G | Grant A | 3.4K | — |
| Jan 7, 2026 | Lewis William | Grant A | 15.3K | $0 |
| Jan 7, 2026 | Lewis William | Grant A | 3.4K | — |
| Jan 7, 2026 | van der Kamp Hilde Johanna | Grant A | 15.3K | $0 |
| Jan 7, 2026 | van der Kamp Hilde Johanna | Grant A | 3.4K | — |
| Jan 7, 2026 | Smither John W | Grant A | 15.3K | $0 |
| Jan 7, 2026 | Smither John W | Grant A | 3.4K | — |
| Jan 7, 2026 | Gulfo Adele M. | Grant A | 15.3K | $0 |
| Jan 7, 2026 | Gulfo Adele M. | Grant A | 3.4K | — |
| Jan 7, 2026 | Davidson Michael H. KEY 10b5-1 | Grant A | 364.0K | $0 |
| Jan 7, 2026 | Davidson Michael H. KEY 10b5-1 | Sell S | 11.6K | — |
| Jan 7, 2026 | Davidson Michael H. KEY 10b5-1 | Grant A | 81.0K | — |
| Jan 7, 2026 | McKenna Mark C. | Grant A | 15.3K | $0 |
| Jan 7, 2026 | McKenna Mark C. | Grant A | 3.4K | — |
| Jan 5, 2026 | Kooij Louise Frederika 10b5-1 | Sell S | 2.6K | $88.0K |
| Jan 5, 2026 | Kastelein Johannes Jacob Pieter 10b5-1 | Sell S | 6.0K | $199.5K |
| Jan 5, 2026 | Somaiya Mayur Ian KEY 10b5-1 | Sell S | 5.1K | $170.2K |
| Dec 26, 2025 | Kooij Louise Frederika 10b5-1 | Exercise M | 38.9K | $0 |
| Dec 26, 2025 | Kooij Louise Frederika 10b5-1 | Exercise M | 5.0K | $0 |
| Dec 26, 2025 | Kooij Louise Frederika 10b5-1 | Sell S | 43.9K | $1.5M |
| Dec 26, 2025 | Kooij Louise Frederika 10b5-1 | Exercise M | 5.0K | $54.5K |
| Dec 26, 2025 | Kooij Louise Frederika 10b5-1 | Exercise M | 38.9K | $388.7K |
| Dec 24, 2025 | Kooij Louise Frederika 10b5-1 | Exercise M | 26.0K | $0 |
| Dec 24, 2025 | Kooij Louise Frederika 10b5-1 | Exercise M | 26.0K | $260.1K |
| Dec 24, 2025 | Kooij Louise Frederika 10b5-1 | Sell S | 26.0K | $928.1K |
| Dec 23, 2025 | Kooij Louise Frederika 10b5-1 | Exercise M | 75.1K | $0 |
| Dec 23, 2025 | Kooij Louise Frederika 10b5-1 | Exercise M | 75.1K | $751.2K |
| Dec 23, 2025 | Kooij Louise Frederika 10b5-1 | Sell S | 75.1K | $2.7M |
| Sep 15, 2025 | Topper James N | Buy P | 660 | $15.6K |
| Sep 9, 2025 | Kooij Louise Frederika | Exercise M | 150.0K | $0 |
| Sep 9, 2025 | Kooij Louise Frederika | Sell S | 53.1K | $1.3M |
| Sep 9, 2025 | Kooij Louise Frederika | Exercise M | 150.0K | $1.5M |
| Sep 9, 2025 | Kooij Louise Frederika | Sell S | 96.9K | $2.5M |
| Sep 8, 2025 | Topper James N | Buy P | 1.3K | $31.5K |
| Sep 3, 2025 | Kooij Louise Frederika | Sell S | 18.1K | $453.5K |
| Sep 2, 2025 | Kooij Louise Frederika | Exercise M | 18.1K | $0 |
| Sep 2, 2025 | Kooij Louise Frederika | Exercise M | 18.1K | — |
| Aug 25, 2025 | Kooij Louise Frederika | Sell S | 8.3K | $205.6K |
| Aug 22, 2025 | Kastelein Johannes Jacob Pieter | Sell S | 42.3K | $1.1M |
| Aug 22, 2025 | Kastelein Johannes Jacob Pieter | Sell S | 7.7K | $195.2K |
| Aug 21, 2025 | Kastelein Johannes Jacob Pieter | Sell S | 50.0K | $1.2M |
| Aug 11, 2025 | Topper James N | Buy P | 471 | $11.3K |
| Jul 16, 2025 | Kling Douglas F 10b5-1 | Exercise M | 51.0K | $0 |
| Jul 16, 2025 | Kling Douglas F 10b5-1 | Sell S | 51.0K | $1.1M |
| Jul 16, 2025 | Kling Douglas F 10b5-1 | Exercise M | 51.0K | $556.4K |
| Jul 15, 2025 | Kling Douglas F 10b5-1 | Exercise M | 47.6K | $0 |
| Jul 15, 2025 | Kling Douglas F 10b5-1 | Sell S | 3.5K | $78.4K |
| Jul 15, 2025 | Kling Douglas F 10b5-1 | Sell S | 44.0K | $941.3K |
| Jul 15, 2025 | Kling Douglas F 10b5-1 | Exercise M | 47.6K | $518.5K |
| Jun 25, 2025 | Topper James N | Buy P | 1.3K | $23.0K |
| Jun 24, 2025 | Topper James N | Buy P | 2.5K | $46.4K |
About NAMS insider trading
This page tracks insider transactions for NewAmsterdam Pharma Co N.V. (NAMS) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.