James Topper

Track

Insider profile

Performance

Overall performance
3.7
Performance over holding periods
4.2
30 days 90 days 120 days
Average return 22% 8.2% 15.1%
Success rate 90% 68% 82%
Transactions
16 100% Buy
34 71% Buy
47 69% Buy
Ranking by holding-period performance
Performance for realised trades
4.4
Average return 1102%
Success rate 73%
Average holding period 220
Transactions 28
Ranking by realised performance
James Topper's trades of NewAmsterdam Pharma Company NV's stock


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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity 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
2025-09-17 2025-09-15
B Purchase
66,118 -25.1%
250.88
US$4,626,473 		66,118 -25.1% 250.88 US$4,626,473
2025-09-10 2025-09-08
B Purchase
85,073 +4.2%
344.65
US$2,128,432 		85,073 +4.2% 344.65 US$2,128,432
2025-08-13 2025-08-11
B Purchase
15,015 -20.6%
334.08
US$1,118,373 		15,015 -20.6% 334.08 US$1,118,373
2025-06-26 2025-06-25
B Purchase
1,260 +0.0%
18.26
US$23,012 		1,260 +0.0% 18.26 US$23,012
2025-06-26 2025-06-24
B Purchase
2,520 +0.1%
18.43
US$46,454 		2,520 +0.1% 18.43 US$46,454
2025-06-18 2025-06-16
B Purchase
8,584 +0.3%
19.50
US$167,381 		8,584 +0.3% 19.50 US$167,381
2025-05-23 2025-05-21
B Purchase
3,780 +6.8%
3.86
US$14,609 		3,780 +6.8% 3.86 US$14,609
2025-05-15 2025-05-14
B Purchase
6,300 +12.8%
3.32
US$20,919 		6,300 +12.8% 3.32 US$20,919
2025-05-15 2025-05-13
B Purchase
1,120 +2.3%
3.16
US$3,543 		1,120 +2.3% 3.16 US$3,543
2025-05-13 2025-05-12
B Purchase
12,601 +35.4%
3.04
US$38,301 		12,601 +35.4% 3.04 US$38,301
2025-05-13 2025-05-09
B Purchase
2,226 +6.7%
3.62
US$8,053 		2,226 +6.7% 3.62 US$8,053
2025-05-13 2025-05-09
B Purchase
33,376 +inf%
3.19
US$106,563 		33,376 +inf% 3.19 US$106,563
2025-03-28 2025-03-26
B Purchase
1,135 +0.0%
22.49
US$25,521 		1,135 +0.0% 22.49 US$25,521
2025-03-06 2025-03-04
B Purchase
4,005 +0.1%
21.02
US$84,203 		4,005 +0.1% 21.02 US$84,203
2024-04-29 2024-04-25
S Sale
19 -0.0%
64.57
US$1,227 		19 -0.0% 64.57 US$1,227
2024-03-28 2024-03-26
B Purchase
8,429 +0.3%
21.50
US$181,224 		8,429 +0.3% 21.50 US$181,224
2020-12-11 2020-12-11
B Purchase
1,000,000 +inf%
10.00
US$10,000,000 		1,000,000 +inf% 10.00 US$10,000,000
2019-01-22 2019-01-18
B Purchase
372,439 +16.9%
5.37
US$1,999,997 		372,439 +16.9% 5.37 US$1,999,997