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NewAmsterdam Pharma Co N.V.

NAMS Net selling
CIK 0001936258 #1687 in the set updated 17 Sep 2026
Bought (12 mo)
$226.50K
out of their own pocket, the only kind of buying there is
Sold (12 mo)
$62.00M
$457.69K on a plan · $57.71M straight out of an exercise
Sold at will
$3.83M
6 of 42 sales
Net
−$61.77M
−$3.61M against sales at will

By person

17 insiders · 44 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
Davidson Michael H.
Chief Executive Officer
$226.50K (1)
$25.33M (9) scheduled
−$25.10M
1,078,638
0.9023%
$24.43M
+31.8%
Kooij Louise Frederika
Chief Accounting Officer
—
$16.75M (16) scheduled
−$16.75M
24,353
0.0204%
$551.60K
—
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
—
$14.26M (7) scheduled
−$14.26M
122,802
0.1027%
$2.78M
—
Somaiya Mayur Ian
Chief Financial Officer
—
$3.43M (6) scheduled
−$3.43M
58,382
0.0488%
$1.32M
—
LANGE LOUIS G
Director
—
$2.19M (3)
−$2.19M
10,360
0.0087%
$234.65K
−58.4%
Smither John W
Director
—
$40.51K (1)
−$40.51K
8,760
0.0073%
$198.41K
—
ForGrowth NAP B.V.
10% owner
—
—
—
10,656,172
8.91%
$241.36M
−9.9%
Topper James N
Director
—
—
—
3,028,524
2.53%
$68.60M
+0.7%
Marino Michael F III
See Remarks
—
—
—
55,000
0.0460%
$1.25M
—
Kling Douglas F
Chief Operating Officer
—
—
—
44,000
0.0368%
$996.60K
—
JONES WILLIAM A JR
Chief Commercial Officer
—
—
—
43,000
0.0360%
$973.95K
—
Audet Juliette Berangere
See Remarks
—
—
—
15,104
0.0126%
$342.11K
—
Gulfo Adele M.
Director
—
—
—
14,260
0.0119%
$322.99K
—
Lewis William
Director
—
—
—
10,360
0.0087%
$234.65K
—
McKenna Mark C.
Director
—
—
—
10,360
0.0087%
$234.65K
—
van der Kamp Hilde Johanna
Director
—
—
—
10,360
0.0087%
$234.65K
—
Gunning Robert William
Vice President, Controller
—
—
—
3,200
0.0027%
$72.48K
—

Individual transactions

32
Insider
Date
Role
Action
Shares
Price
Amount
Kastelein Johannes Jacob Pieter
24 Aug 2026
Chief Scientific Officer
Sold after exercise indirect
125,000
$26.91
$3.36M
Kooij Louise Frederika
20 Jul 2026
Chief Accounting Officer
Sold after exercise
2,915
$31.71
$92.43K
Kooij Louise Frederika
20 Jul 2026
Chief Accounting Officer
Sold after exercise
31,885
$31.05
$990.03K
Kooij Louise Frederika
20 Jul 2026
Chief Accounting Officer
Sold after exercise
70,200
$29.96
$2.10M
Kooij Louise Frederika
22 Jun 2026
Chief Accounting Officer
Sold after exercise
300
$30.73
$9.22K
Kooij Louise Frederika
22 Jun 2026
Chief Accounting Officer
Sold after exercise
39,700
$30.20
$1.20M
Kooij Louise Frederika
26 May 2026
Chief Accounting Officer
Sold after exercise
65,000
$35.69
$2.32M
Kastelein Johannes Jacob Pieter
9 Mar 2026
Chief Scientific Officer
Sold after exercise indirect
101,409
$30.29
$3.07M
Kastelein Johannes Jacob Pieter
6 Mar 2026
Chief Scientific Officer
Sold after exercise indirect
94,124
$30.32
$2.85M
Kastelein Johannes Jacob Pieter
5 Mar 2026
Chief Scientific Officer
Sold after exercise indirect
104,467
$30.30
$3.17M
Davidson Michael H.
2 Mar 2026
Chief Executive Officer
Sold after exercise
443,707
$33.25
$14.75M
Davidson Michael H.
26 Feb 2026
Chief Executive Officer
Sold after exercise
17,924
$34.44
$617.30K
Davidson Michael H.
26 Feb 2026
Chief Executive Officer
Sold after exercise
165,408
$33.63
$5.56M
Davidson Michael H.
25 Feb 2026
Chief Executive Officer
Sold after exercise
1,300
$36.68
$47.68K
Davidson Michael H.
25 Feb 2026
Chief Executive Officer
Sold after exercise
10,436
$35.96
$375.28K
Davidson Michael H.
25 Feb 2026
Chief Executive Officer
Sold after exercise
46,517
$35.11
$1.63M
Davidson Michael H.
24 Feb 2026
Chief Executive Officer
Sold after exercise
3,161
$36.46
$115.25K
Davidson Michael H.
24 Feb 2026
Chief Executive Officer
Sold after exercise
61,547
$36.13
$2.22M
Kooij Louise Frederika
28 Jan 2026
Chief Accounting Officer
Sold after exercise
32,612
$31.80
$1.04M
Kooij Louise Frederika
27 Jan 2026
Chief Accounting Officer
Sold after exercise
39,816
$32.62
$1.30M
Kooij Louise Frederika
26 Jan 2026
Chief Accounting Officer
Sold after exercise
309
$33.45
$10.34K
Kooij Louise Frederika
26 Jan 2026
Chief Accounting Officer
Sold after exercise
34,091
$32.77
$1.12M
Kooij Louise Frederika
23 Jan 2026
Chief Accounting Officer
Sold after exercise
12,767
$34.37
$438.80K
Kooij Louise Frederika
23 Jan 2026
Chief Accounting Officer
Sold after exercise
25,405
$33.44
$849.54K
Somaiya Mayur Ian
21 Jan 2026
Chief Financial Officer
Sold after exercise
24,362
$33.80
$823.44K
Somaiya Mayur Ian
21 Jan 2026
Chief Financial Officer
Sold after exercise
15,422
$33.25
$512.78K
Somaiya Mayur Ian
20 Jan 2026
Chief Financial Officer
Sold after exercise
19,604
$32.38
$634.78K
Somaiya Mayur Ian
20 Jan 2026
Chief Financial Officer
Sold after exercise
39,712
$31.78
$1.26M
Somaiya Mayur Ian
20 Jan 2026
Chief Financial Officer
Sold after exercise
900
$30.64
$27.58K
Kooij Louise Frederika
26 Dec 2025
Chief Accounting Officer
Sold after exercise
43,872
$35.30
$1.55M
Kooij Louise Frederika
24 Dec 2025
Chief Accounting Officer
Sold after exercise
26,011
$35.68
$928.07K
Kooij Louise Frederika
23 Dec 2025
Chief Accounting Officer
Sold after exercise
75,117
$36.21
$2.72M
Show all 44 transactions →

What was left out

Form 4 filings counted 28
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 0
Sales on a Rule 10b5-1 plan 4
Sales straight out of an exercise 32
Sales at will 6
Transactions with no price 1
Shares from compensation/vesting 1,987,219
History held since 3 Jan 2024