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 JS
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Detailed Insider History for:
NEWAMSTERDAM PHARMA CO N V: NAMS
Price: 3/13/26 52-Wk
High		 52-Wk
Low		 Mkt Cap (mm) Shrs Out (mm) 3-Mth Ave
Vol (m)		 Ind. Yield Short Int
% Float		 Inst. Owned Insider Owned
$28.62 $42.00 $14.06 $3,291 115 781 0.0% 7.9% 106.13% 1.01%
Exch Sector Industry Sub-Industry
NasdaqGM Manufacturing Chemicals And Allied Products Pharmaceutical Preparations
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Insider Statistics
T N H M S
Filer Name
Insider Title
Trans Type
Dollar Value
Shares Traded
Trans Date From
Trans Date To
Trans Price From
Trans Price To
Total Holdings
Delta % Owned
Owned
Other Info
Input Date
1
1w
2
100%
-6%
4
LANGE LOUIS G
DIR
S
$1,357,230
44,619
---
3/11/26
$30.41
$31.23
10,360
-81.2
D
---
3/12/26 - 4:25:23 pm
2
1y
1
0%
-14%
4
LANGE LOUIS G
DIR
OB
$513,119
44,619
---
3/9/26
---
$11.50
54,979
430.7
D
---
3/10/26 - 8:58:01 pm
3
    
 
KASTELEIN JOHANNES JACOB PIETER
DIR
AS
$9,090,868
300,000
3/5/26
3/9/26
---
$30.29
69,302
-81.2
I
10b
3/9/26 - 8:18:01 pm
4
    
 
KASTELEIN JOHANNES JACOB PIETER
DIR
JB
---
300,000
3/5/26
3/9/26
---
---
173,769
---
I
10b
3/9/26 - 8:18:01 pm
5
1w
2
100%
-6%
4
LANGE LOUIS G
DIR
S
$828,950
28,186
---
3/6/26
---
$29.41
---
All
I
---
3/10/26 - 8:58:01 pm
6
    
 
DAVIDSON MICHAEL H
CEO,DIR
S
$14,753,258
443,707
---
3/2/26
---
$33.25
174,144
-71.8
D
---
3/2/26 - 6:08:05 pm
7
    
 
DAVIDSON MICHAEL H
CEO,DIR
JB
---
443,707
---
3/2/26
---
---
617,851
254.8
D
---
3/2/26 - 6:08:05 pm
8
    
 
DAVIDSON MICHAEL H
CEO,DIR
AS
$10,575,091
306,293
2/24/26
2/26/26
$33.63
$34.44
174,144
-63.8
D
10b
2/26/26 - 9:40:55 pm
9
    
 
DAVIDSON MICHAEL H
CEO,DIR
JB
---
306,293
2/24/26
2/26/26
---
---
643,191
90.9
D
10b
2/26/26 - 9:40:55 pm
10
    
 
KASTELEIN JOHANNES JACOB PIETER
DIR
S
$1,605,998
45,481
---
2/20/26
$35.00
$35.46
53,500
-45.9
D
---
2/24/26 - 4:40:11 pm
11
    
 
KOOIJ LOUISE FREDERIKA
CAO
OS
$2,335,860
72,428
1/27/26
1/28/26
---
$31.80
24,353
-74.8
D
10b
1/29/26 - 4:40:24 pm
12
    
 
KOOIJ LOUISE FREDERIKA
CAO
OE
$789,465
72,428
1/27/26
1/28/26
---
$10.90
64,169
---
D
10b
1/29/26 - 4:40:24 pm
13
    
 
KOOIJ LOUISE FREDERIKA
CAO
OS
$2,415,843
72,572
1/23/26
1/26/26
$32.77
$33.45
24,353
-74.9
D
10b
1/27/26 - 5:38:55 pm
14
    
 
KOOIJ LOUISE FREDERIKA
CAO
OE
$791,035
72,572
1/23/26
1/26/26
---
$10.90
62,525
---
D
10b
1/27/26 - 5:38:55 pm
15
    
 
SOMAIYA MAYUR IAN
CFO
OS
$3,260,618
100,000
1/20/26
1/21/26
$30.64
$33.80
58,382
-63.1
D
10b
1/22/26 - 5:24:59 pm
16
    
 
SOMAIYA MAYUR IAN
CFO
OE
$926,000
100,000
1/20/26
1/21/26
---
$9.26
118,598
537.7
D
10b
1/22/26 - 5:24:59 pm
17
    
 
VAN DER KAMP HILDE JOHANNA
DIR
JB
---
3,400
---
1/7/26
---
---
10,360
48.9
D
R
1/9/26 - 7:34:59 pm
18
    
 
GULFO ADELE M
DIR
JB
---
3,400
---
1/7/26
---
---
14,260
31.3
D
R
1/9/26 - 7:34:36 pm
19
    
 
DAVIDSON MICHAEL H
CEO,DIR
JS
---
11,582
---
1/7/26
---
---
378,859
-3.0
D
R,10b
1/9/26 - 7:34:21 pm
20
    
 
DAVIDSON MICHAEL H
CEO,DIR
JB
---
81,000
---
1/7/26
---
---
459,859
21.4
D
R,10b
1/9/26 - 7:34:21 pm
21
    
 
LEWIS WILLIAM
DIR
JB
---
3,400
---
1/7/26
---
---
10,360
48.9
D
R
1/9/26 - 7:34:07 pm
22
    
 
SMITHER JOHN W
DIR
JB
---
3,400
---
1/7/26
---
---
10,360
48.9
D
R
1/9/26 - 7:33:38 pm
23
    
 
MCKENNA MARK C
DIR
JB
---
3,400
---
1/7/26
---
---
10,360
48.9
D
R
1/9/26 - 7:33:22 pm
24
    
 
LANGE LOUIS G
DIR
JB
---
3,400
---
1/7/26
---
---
10,360
48.9
D
R
1/9/26 - 7:33:10 pm
25
    
 
KASTELEIN JOHANNES JACOB PIETER
DIR
JB
---
25,500
---
1/7/26
---
---
98,981
34.7
D
R,10b
1/7/26 - 6:31:26 pm
26
    
 
KOOIJ LOUISE FREDERIKA
CAO
JB
---
12,000
---
1/7/26
---
---
24,353
97.1
D
R,10b
1/7/26 - 6:27:55 pm
27
    
 
SOMAIYA MAYUR IAN
CFO
JB
---
25,500
---
1/7/26
---
---
58,382
77.6
D
R,10b
1/7/26 - 6:27:26 pm
28
    
 
KASTELEIN JOHANNES JACOB PIETER
DIR
AS
$199,500
6,000
---
1/5/26
---
$33.25
73,481
-7.5
D
R,10b
1/7/26 - 6:31:26 pm
29
    
 
KOOIJ LOUISE FREDERIKA
CAO
AS
$88,013
2,647
---
1/5/26
---
$33.25
12,353
-17.6
D
R,10b
1/7/26 - 6:27:55 pm
30
    
 
SOMAIYA MAYUR IAN
CFO
AS
$170,174
5,118
---
1/5/26
---
$33.25
32,882
-13.5
D
R,10b
1/7/26 - 6:27:26 pm
31
    
 
KOOIJ LOUISE FREDERIKA
CAO
OS
$5,196,741
145,000
12/23/25
12/26/25
---
$35.30
15,000
-90.6
D
10b
12/29/25 - 5:14:14 pm
32
    
 
KOOIJ LOUISE FREDERIKA
CAO
OE
$1,454,500
145,000
12/23/25
12/26/25
$10.00
$10.90
90,117
---
D
10b
12/29/25 - 5:14:14 pm
33
1y
2
50%
10%
10
TOPPER JAMES N
DIR
B
$15,639
660
---
9/15/25
---
$23.70
3,028,524
0.0
I
---
9/17/25 - 5:22:34 pm
34
    
 
KOOIJ LOUISE FREDERIKA
CAO
OS
$3,874,017
150,000
---
9/9/25
$25.31
$26.11
15,000
-90.9
D
---
9/10/25 - 5:39:03 pm
35
    
 
KOOIJ LOUISE FREDERIKA
CAO
OE
$1,500,000
150,000
---
9/9/25
---
$10.00
165,000
1,000.0
D
---
9/10/25 - 5:39:03 pm
36
1y
2
50%
10%
10
TOPPER JAMES N
DIR
B
$31,487
1,260
---
9/8/25
---
$24.99
3,027,864
0.0
I
---
9/10/25 - 5:19:10 pm
37
    
 
KOOIJ LOUISE FREDERIKA
CAO
S
$453,452
18,073
---
9/3/25
---
$25.09
15,000
-54.6
D
---
9/5/25 - 5:06:36 pm
38
    
 
KOOIJ LOUISE FREDERIKA
CAO
JB
---
18,073
---
9/2/25
---
---
33,073
120.5
D
---
9/4/25 - 5:43:24 pm
39
    
 
KOOIJ LOUISE FREDERIKA
CAO
S
$205,567
8,269
---
8/25/25
---
$24.86
15,000
-35.5
D
---
8/27/25 - 5:08:32 pm
40
    
 
KASTELEIN JOHANNES JACOB PIETER
DIR
S
$2,471,640
100,000
8/21/25
8/22/25
$24.29
$25.49
69,302
-59.1
I
---
8/25/25 - 5:04:16 pm
41
1y
2
50%
10%
10
TOPPER JAMES N
DIR
B
$11,294
471
---
8/11/25
---
$23.98
3,026,604
0.0
I
---
8/13/25 - 4:49:54 pm
42
    
 
KLING DOUGLAS F
COO
OS
$2,096,655
98,612
7/15/25
7/16/25
---
$21.10
44,000
-69.1
D
10b
7/17/25 - 5:19:01 pm
43
    
 
KLING DOUGLAS F
COO
OE
$1,074,871
98,612
7/15/25
7/16/25
---
$10.90
95,043
---
D
10b
7/17/25 - 5:19:01 pm
44
1y
2
50%
10%
10
TOPPER JAMES N
DIR
B
$69,466
3,780
6/24/25
6/25/25
---
$18.26
3,026,133
0.1
I
---
6/26/25 - 7:41:52 pm
45
    
 
KLING DOUGLAS F
COO
OS
$1,929,141
100,000
---
6/16/25
$19.19
$19.75
44,000
-69.4
D
10b
6/18/25 - 4:50:44 pm
46
    
 
KLING DOUGLAS F
COO
OE
$1,019,709
100,000
---
6/16/25
$10.00
$10.90
144,000
227.3
D
10b
6/18/25 - 4:50:44 pm
47
1y
2
50%
10%
10
TOPPER JAMES N
DIR
B
$167,381
8,584
---
6/16/25
---
$19.50
3,022,153
0.3
I
---
6/18/25 - 4:42:40 pm
48
    
 
MARINO MICHAEL F III
O
JB
---
55,000
---
6/1/25
---
---
55,000
New
D
R
6/3/25 - 5:02:34 pm
49
    
 
LANGE LOUIS G
DIR
JB
---
68
---
6/1/25
---
---
28,186
0.2
I
---
6/3/25 - 4:59:38 pm
50
    
 
MARINO MICHAEL F III
O
3
---
---
---
5/27/25
---
---
---
---
---
---
6/3/25 - 4:58:12 pm
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