DD
Insider
David M Demski
DirectorDavid M Demski (Director) filed 1 Form 4 report in the trailing twelve months (0 purchases, 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.
Add to watchlistReturn, ttmiAverage return per filing, trailing twelve months
–
no purchases on file
Delay-adjustediThe same average, entered at disclosure dates
–
returns measure stock purchases only
Filings, ttm
1
0 buys · 1 sells
Median delay
–
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$636K
shares × price, as filed
Last traded
Dec 11 2025
Filed Dec 12 2025
Median ADV $21.7M across their filed names
Open performance→Volume by month
Buys $0
Sells $636K
Shares × price, as filed · by filing month · past 24 months
Sectors filed on
Healthcare
1 filing
Sector per market data · by filing · past 12 months
Most traded names
ATECRecent filings
ATECSALE
Alphatec Holdings, Inc.
View filing →
$636K30,000 sh × $21.20
Exec Dec 11 2025
Filed Dec 12 2025 · 5:30 PM ET