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Demski David M

Track

Insider profile

Performance

Overall performance
3.5
Performance over holding periods
4.2
30 days 90 days 120 days
Average return 13% 8.2% 15.1%
Success rate 100% 68% 82%
Transactions
4 75% Buy
34 71% Buy
47 69% Buy
Ranking by holding-period performance
Performance for realised trades
4.4
Average return 102%
Success rate 73%
Average holding period 220
Transactions 28
Ranking by realised performance
Demski David M's trades of Alphatec Holdings Inc'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
2025-12-12 2025-12-11
S Sale
38,398 +38.5%
315.16
US$2,056,515 		38,398 +38.5% 315.16 US$2,056,515
2025-12-11 2025-12-11
PrS Proposed sale
63,793
194.47
US$3,918,468 		63,793 194.47 US$3,918,468
2024-08-21 2024-08-21
B Purchase
84,699 -28.0%
117.94
US$4,188,109 		84,699 -28.0% 117.94 US$4,188,109
2024-08-05 2024-08-02
B Purchase
40,000 +20.2%
6.56
US$262,400 		40,000 +20.2% 6.56 US$262,400
2023-11-13 2023-11-09
B Purchase
30,000 +19.8%
10.50
US$315,000 		30,000 +19.8% 10.50 US$315,000
2020-12-18 2020-12-17
PlS Planned sale
164,719 -100.0%
64.20
US$10,574,960 		164,719 -100.0% 64.20 US$10,574,960
2020-12-18 2020-12-16
PlS Planned sale
52,356 -26.0%
64.20
US$3,361,255 		52,356 -26.0% 64.20 US$3,361,255
2020-08-10 2020-08-06
PlS Planned sale
165,000 -100.0%
57.02
US$9,408,300 		165,000 -100.0% 57.02 US$9,408,300
2020-08-10 2020-08-06
PlS Planned sale
68,100 -29.2%
56.24
US$3,829,944 		68,100 -29.2% 56.24 US$3,829,944
2020-08-10 2020-08-06
PlS Planned sale
96,900 -29.4%
55.42
US$5,370,198 		96,900 -29.4% 55.42 US$5,370,198