DD
David M Demski (Director) filed 2 Form 4 reports in the trailing twelve months (1 purchase, 1 sale), most often in Alphatec Holdings, Inc. (ATEC). The largest single filing was $636K of ATEC (30,000 sh × $21.20, as filed), executed Dec 11 2025. The median gap between execution and disclosure was 3 days. Data as of Nov 8 2026.
Add to watchlistReturn, ttmiAverage return per filing, trailing twelve months
–
purchases not yet priced
Delay-adjustediThe same average, entered at disclosure dates
–
purchases not yet priced
Filings, ttm
2
1 buys · 1 sells
Median delay
3d
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$1.0M
shares × price, as filed
Last traded
Oct 30
Filed Nov 2
Median ADV $21.7M across their filed names
100% of their measured filings could not be priced (delisted or unquoted names). The returns above cover only what still trades.
Open performance→Volume by month
Buys $409K
Sells $636K
Shares × price, as filed · by filing month · past 24 months
Sectors filed on
Healthcare
2 filings
Sector per market data · by filing · past 12 months
Most traded names
ATECRecent filings
ATECPURCHASE
Alphatec Holdings, Inc.
View filing →
$409K60,000 sh × $6.81
Exec Oct 30
Filed Nov 2 · 12:23 PM ET ATECSALE Alphatec Holdings, Inc. View filing → $636K
30,000 sh × $21.20
Exec Dec 11 2025
Filed Dec 12 2025 · 5:30 PM ET