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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

12
Insider
Date
Role
Action
Shares
Price
Amount
Smither John W
4 Sep 2026
Director
Sell
1,600
$25.32
$40.51K
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
LANGE LOUIS G
6 Mar 2026
Director
Sell indirect
28,186
$29.41
$828.95K
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
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
Kooij Louise Frederika
1 Oct 2024
Chief Accounting Officer
Sell
45,000
$15.72
$707.40K
Show all 116 transactions →

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