Kastelein Johannes Jacob Pieter

Insider profile

Performance

Overall performance
2.4
Performance over holding periods
2.4
30 days 90 days 120 days
Average return -2% 8.2% 15.1%
Success rate 48% 68% 82%
Transactions
12 0% Buy
34 71% Buy
47 69% Buy
Ranking by holding-period performance
Kastelein Johannes Jacob Pieter's trades of NewAmsterdam Pharma Company N.V.'s stock


• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date Company B/S Transaction type Nb. shares
Price
Value 		Number of shares Price Value Details
2026-10-02 2026-09-30
S Sale
37,473 -23.4%
493.80
US$3,585,260 		37,473 -23.4% 493.80 US$3,585,260
2026-08-25 2026-08-25
PrS Proposed sale
30,857
459.30
US$4,345,631 		30,857 459.30 US$4,345,631
2026-08-25 2026-08-24
S Sale
66,609 -37.0%
212.88
US$990,054 		66,609 -37.0% 212.88 US$990,054
2026-08-24 2026-08-24
PrS Proposed sale
125,000
27.87
US$3,483,750 		125,000 27.87 US$3,483,750
2026-03-09 2026-03-09
S Sale
101,409 -59.4%
30.29
US$3,071,679 		101,409 -59.4% 30.29 US$3,071,679
2026-03-09 2026-03-06
S Sale
94,124 -57.6%
30.32
US$2,853,840 		94,124 -57.6% 30.32 US$2,853,840
2026-03-09 2026-03-05
S Sale
104,467 -60.1%
30.30
US$3,165,350 		104,467 -60.1% 30.30 US$3,165,350
2026-03-05 2026-03-02
PrS Proposed sale
300,000
31.18
US$9,354,000 		300,000 31.18 US$9,354,000
2026-02-24 2026-02-20
S Sale
30,789 -36.5%
35.46
US$1,091,778 		30,789 -36.5% 35.46 US$1,091,778
2026-02-24 2026-02-20
S Sale
14,692 -14.8%
35.00
US$514,220 		14,692 -14.8% 35.00 US$514,220
2026-02-20 2026-02-20
PrS Proposed sale
45,481
34.63
US$1,575,007 		45,481 34.63 US$1,575,007
2026-01-07 2026-01-05
S Sale
6,000 -7.5%
33.25
US$199,500 		6,000 -7.5% 33.25 US$199,500
2026-01-05 2026-01-05
PrS Proposed sale
6,000
33.25
US$199,499 		6,000 33.25 US$199,499
2025-08-25 2025-08-22
S Sale
7,658 -10.0%
25.49
US$195,202 		7,658 -10.0% 25.49 US$195,202
2025-08-25 2025-08-22
S Sale
42,342 -35.5%
25.08
US$1,061,937 		42,342 -35.5% 25.08 US$1,061,937
2025-08-25 2025-08-21
PrS Proposed sale
100,000
25.00
US$2,500,000 		100,000 25.00 US$2,500,000
2025-08-25 2025-08-21
S Sale
50,000 -29.5%
24.29
US$1,214,500 		50,000 -29.5% 24.29 US$1,214,500
2024-03-27 2024-03-26
S Sale
190,476 -100.0%
21.50
US$4,095,234 		190,476 -100.0% 21.50 US$4,095,234
2024-03-26 2024-03-26
PrS Proposed sale
190,476
21.50
US$4,095,234 		190,476 21.50 US$4,095,234