Kastelein Johannes Jacob Pieter

Track

Insider profile

Performance

Overall performance
2.2
Performance over holding periods
2.2
30 days 90 days 120 days
Average return -6% 8.2% 15.1%
Success rate 34% 68% 82%
Transactions
10 0% Buy
34 71% Buy
47 69% Buy
Ranking by holding-period performance
Kastelein Johannes Jacob Pieter's trades of NewAmsterdam Pharma Company NV'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
2026-03-09 2026-03-09
S Sale
22,887 +45.2%
496.81
US$1,326,201 		22,887 +45.2% 496.81 US$1,326,201
2026-03-09 2026-03-06
S Sale
19,255 -14.3%
228.86
US$1,995,366 		19,255 -14.3% 228.86 US$1,995,366
2026-03-09 2026-03-05
S Sale
75,063 -0.9%
149.26
US$4,274,819 		75,063 -0.9% 149.26 US$4,274,819
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