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NewAmsterdam Pharma Co N.V.

NAMS Net selling
CIK 0001936258 #1687 in the set updated 17 Sep 2026
Bought (120 mo)
$1.09M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$110.91M
$30.48M on a plan · $72.76M straight out of an exercise
Sold at will
$7.67M
12 of 101 sales
Net
−$109.81M
−$6.58M against sales at will

By person

17 insiders · 116 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
ForGrowth NAP B.V.
10% owner
—
$30.02M (25) scheduled
−$30.02M
10,656,172
8.91%
$241.36M
−9.9%
Kooij Louise Frederika
Chief Accounting Officer
—
$25.05M (22) scheduled
−$25.05M
24,353
0.0204%
$551.60K
—
Davidson Michael H.
Chief Executive Officer
$394.16K (3)
$25.33M (10) scheduled
−$24.93M
1,078,638
0.9023%
$24.43M
+33.4%
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
—
$20.83M (11) scheduled
−$20.83M
122,802
0.1027%
$2.78M
—
Kling Douglas F
Chief Operating Officer
—
$4.03M (19) scheduled
−$4.03M
44,000
0.0368%
$996.60K
—
Somaiya Mayur Ian
Chief Financial Officer
—
$3.43M (10) scheduled
−$3.43M
58,382
0.0488%
$1.32M
—
LANGE LOUIS G
Director
$95.00K (1)
$2.19M (3)
−$2.09M
10,360
0.0087%
$234.65K
−47.9%
Topper James N
Director
$586.21K (9)
—
+$586.21K
3,028,524
2.53%
$68.60M
+0.9%
Smither John W
Director
—
$40.51K (1)
−$40.51K
8,760
0.0073%
$198.41K
—
Audet Juliette Berangere
See Remarks
$17.33K (1)
—
+$17.33K
15,104
0.0126%
$342.11K
—
Marino Michael F III
See Remarks
—
—
—
55,000
0.0460%
$1.25M
—
JONES WILLIAM A JR
Chief Commercial Officer
—
—
—
43,000
0.0360%
$973.95K
—
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

116
Insider
Date
Role
Action
Shares
Price
Amount
Davidson Michael H.
14 Sep 2026
Chief Executive Officer
Buy
10,000
$22.65
$226.50K
Smither John W
4 Sep 2026
Director
Sell
1,600
$25.32
$40.51K
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
LANGE LOUIS G
11 Mar 2026
Director
Sell
446
$31.23
$13.93K
LANGE LOUIS G
11 Mar 2026
Director
Sell
44,173
$30.41
$1.34M
Kastelein Johannes Jacob Pieter
9 Mar 2026
Chief Scientific Officer
Sold after exercise indirect
101,409
$30.29
$3.07M
LANGE LOUIS G
9 Mar 2026
Director
Exercised, kept
44,619
$11.50
$513.12K
Kastelein Johannes Jacob Pieter
6 Mar 2026
Chief Scientific Officer
Sold after exercise indirect
94,124
$30.32
$2.85M
LANGE LOUIS G
6 Mar 2026
Director
Sell indirect
28,186
$29.41
$828.95K
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
Kastelein Johannes Jacob Pieter
20 Feb 2026
Chief Scientific Officer
Sell
30,789
$35.46
$1.09M
Kastelein Johannes Jacob Pieter
20 Feb 2026
Chief Scientific Officer
Sell
14,692
$35.00
$514.22K
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
Davidson Michael H.
7 Jan 2026
Chief Executive Officer
Sold on a plan
11,582
—
no price
Somaiya Mayur Ian
5 Jan 2026
Chief Financial Officer
Sold on a plan
5,118
$33.25
$170.17K
Kooij Louise Frederika
5 Jan 2026
Chief Accounting Officer
Sold on a plan
2,647
$33.25
$88.01K
Kastelein Johannes Jacob Pieter
5 Jan 2026
Chief Scientific Officer
Sold on a plan
6,000
$33.25
$199.50K
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
Topper James N
15 Sep 2025
Director
Buy indirect
660
$23.70
$15.64K
Kooij Louise Frederika
9 Sep 2025
Chief Accounting Officer
Sold after exercise
96,896
$26.11
$2.53M
Kooij Louise Frederika
9 Sep 2025
Chief Accounting Officer
Sold after exercise
53,104
$25.31
$1.34M
Topper James N
8 Sep 2025
Director
Buy indirect
1,260
$24.99
$31.49K
Kooij Louise Frederika
3 Sep 2025
Chief Accounting Officer
Sell
18,073
$25.09
$453.45K
Kooij Louise Frederika
25 Aug 2025
Chief Accounting Officer
Sell
8,269
$24.86
$205.57K
Kastelein Johannes Jacob Pieter
22 Aug 2025
Chief Scientific Officer
Sell indirect
7,658
$25.49
$195.20K
Kastelein Johannes Jacob Pieter
22 Aug 2025
Chief Scientific Officer
Sell indirect
42,342
$25.08
$1.06M
Kastelein Johannes Jacob Pieter
21 Aug 2025
Chief Scientific Officer
Sell indirect
50,000
$24.29
$1.21M
Topper James N
11 Aug 2025
Director
Buy indirect
471
$23.98
$11.29K
Kling Douglas F
16 Jul 2025
Chief Operating Officer
Sold after exercise
51,043
$21.10
$1.08M
Kling Douglas F
15 Jul 2025
Chief Operating Officer
Sold after exercise
3,544
$22.12
$78.39K
Kling Douglas F
15 Jul 2025
Chief Operating Officer
Sold after exercise
44,025
$21.38
$941.25K
Topper James N
25 Jun 2025
Director
Buy indirect
1,260
$18.26
$23.01K
Topper James N
24 Jun 2025
Director
Buy indirect
2,520
$18.43
$46.45K
Topper James N
16 Jun 2025
Director
Buy indirect
8,584
$19.50
$167.38K
Kling Douglas F
16 Jun 2025
Chief Operating Officer
Sold after exercise
18,109
$19.75
$357.65K
Kling Douglas F
16 Jun 2025
Chief Operating Officer
Sold after exercise
81,891
$19.19
$1.57M
Kling Douglas F
15 May 2025
Chief Operating Officer
Sold after exercise
100,000
—
no price
Kling Douglas F
15 Apr 2025
Chief Operating Officer
Sold after exercise
910
—
no price
Kling Douglas F
15 Apr 2025
Chief Operating Officer
Sold after exercise
99,090
—
no price
Davidson Michael H.
26 Mar 2025
Chief Executive Officer
Sold after exercise
12,258
—
no price
Kling Douglas F
26 Mar 2025
Chief Operating Officer
Sold after exercise
16,539
—
no price
Topper James N
26 Mar 2025
Director
Buy indirect
1,135
$22.49
$25.52K
Kling Douglas F
17 Mar 2025
Chief Operating Officer
Sold after exercise
100,000
—
no price
Kooij Louise Frederika
4 Mar 2025
Chief Accounting Officer
Sold after exercise
150,000
$20.37
$3.06M
Topper James N
4 Mar 2025
Director
Buy indirect
4,005
$21.02
$84.20K
Kling Douglas F
19 Feb 2025
Chief Operating Officer
Sold after exercise
9,218
—
no price
Kling Douglas F
18 Feb 2025
Chief Operating Officer
Sold after exercise
90,782
—
no price
Kling Douglas F
30 Jan 2025
Chief Operating Officer
Sold after exercise
8,914
—
no price
Kling Douglas F
30 Jan 2025
Chief Operating Officer
Sold after exercise
4,664
—
no price
Kling Douglas F
29 Jan 2025
Chief Operating Officer
Sold after exercise
56,863
—
no price
Kling Douglas F
28 Jan 2025
Chief Operating Officer
Sold after exercise
5,148
—
no price
Kling Douglas F
28 Jan 2025
Chief Operating Officer
Sold after exercise
20,237
—
no price
Somaiya Mayur Ian
28 Jan 2025
Chief Financial Officer
Sold after exercise
3,405
—
no price
Somaiya Mayur Ian
28 Jan 2025
Chief Financial Officer
Sold after exercise
11,495
—
no price
Kling Douglas F
27 Jan 2025
Chief Operating Officer
Sold after exercise
23,815
—
no price
Kling Douglas F
27 Jan 2025
Chief Operating Officer
Sold after exercise
80,359
—
no price
Somaiya Mayur Ian
27 Jan 2025
Chief Financial Officer
Sold after exercise
13,304
—
no price
Somaiya Mayur Ian
27 Jan 2025
Chief Financial Officer
Sold after exercise
33,679
—
no price
ForGrowth NAP B.V.
30 Dec 2024
10% owner
Sold on a plan indirect
29,846
$25.54
$762.17K
ForGrowth NAP B.V.
27 Dec 2024
10% owner
Sold on a plan indirect
41,472
$25.95
$1.08M
ForGrowth NAP B.V.
26 Dec 2024
10% owner
Sold on a plan indirect
33,438
$26.01
$869.63K
ForGrowth NAP B.V.
24 Dec 2024
10% owner
Sold on a plan indirect
16,164
$25.66
$414.83K
ForGrowth NAP B.V.
23 Dec 2024
10% owner
Sold on a plan indirect
25,132
$25.49
$640.62K
ForGrowth NAP B.V.
20 Dec 2024
10% owner
Sold on a plan indirect
5,629
$26.13
$147.07K
ForGrowth NAP B.V.
20 Dec 2024
10% owner
Sold on a plan indirect
44,143
$25.53
$1.13M
ForGrowth NAP B.V.
19 Dec 2024
10% owner
Sold on a plan indirect
56,506
$25.45
$1.44M
ForGrowth NAP B.V.
18 Dec 2024
10% owner
Sold on a plan indirect
46,210
$26.55
$1.23M
ForGrowth NAP B.V.
18 Dec 2024
10% owner
Sold on a plan indirect
54,518
$25.72
$1.40M
ForGrowth NAP B.V.
17 Dec 2024
10% owner
Sold on a plan indirect
47,736
$26.45
$1.26M
ForGrowth NAP B.V.
17 Dec 2024
10% owner
Sold on a plan indirect
66,648
$25.60
$1.71M
ForGrowth NAP B.V.
16 Dec 2024
10% owner
Sold on a plan indirect
1,096
$25.00
$27.40K
ForGrowth NAP B.V.
13 Dec 2024
10% owner
Sold on a plan indirect
25,751
$25.01
$644.05K
ForGrowth NAP B.V.
12 Dec 2024
10% owner
Sold on a plan indirect
25,963
$26.18
$679.62K
ForGrowth NAP B.V.
12 Dec 2024
10% owner
Sold on a plan indirect
140,048
$25.25
$3.54M
ForGrowth NAP B.V.
11 Dec 2024
10% owner
Sold on a plan indirect
4,894
$27.11
$132.67K
ForGrowth NAP B.V.
11 Dec 2024
10% owner
Sold on a plan indirect
18,583
$26.41
$490.68K
ForGrowth NAP B.V.
11 Dec 2024
10% owner
Sold on a plan indirect
130,561
$25.26
$3.30M
ForGrowth NAP B.V.
10 Dec 2024
10% owner
Sold on a plan indirect
48,511
$26.15
$1.27M
ForGrowth NAP B.V.
10 Dec 2024
10% owner
Sold on a plan indirect
259,739
$25.22
$6.55M
ForGrowth NAP B.V.
18 Nov 2024
10% owner
Sold on a plan indirect
33,273
$25.08
$834.44K
ForGrowth NAP B.V.
15 Nov 2024
10% owner
Sold on a plan indirect
8,530
$25.02
$213.44K
ForGrowth NAP B.V.
14 Nov 2024
10% owner
Sold on a plan indirect
9,832
$25.01
$245.86K
ForGrowth NAP B.V.
13 Nov 2024
10% owner
Sold on a plan indirect
1,066
$25.00
$26.65K
Kooij Louise Frederika
1 Oct 2024
Chief Accounting Officer
Sell
45,000
$15.72
$707.40K
Audet Juliette Berangere
26 Sep 2024
Chief Business Officer
Buy
1,104
$15.70
$17.33K
Davidson Michael H.
20 Aug 2024
Chief Executive Officer
Buy
5,000
$16.27
$81.35K
Davidson Michael H.
20 Jun 2024
Chief Executive Officer
Buy
5,000
$17.26
$86.31K
Kastelein Johannes Jacob Pieter
26 Mar 2024
Chief Scientific Officer
Sold after exercise indirect
190,476
$21.50
$4.10M
Topper James N
26 Mar 2024
Director
Buy indirect
8,429
$21.50
$181.22K
LANGE LOUIS G
13 Feb 2024
Director
Buy indirect
5,000
$19.00
$95.00K

What was left out

Form 4 filings counted 108
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 10
Sales on a Rule 10b5-1 plan 29
Sales straight out of an exercise 60
Sales at will 12
Transactions with no price 20
Shares from compensation/vesting 4,148,131
History held since 3 Jan 2024