Insider filing · ATEC
David M Demski
Director
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Alphatec Holdings, Inc.
ATEC · Healthcare · 66 filings in 24 months
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David M Demski sold $636K of Alphatec (ATEC)
Executed Dec 11 2025, disclosed Dec 12 2025, 1 day later.
Value, as filed
$636K
30,000 sh × $21.20
Executed
Dec 11 2025
the trade date, as filed
Disclosed
Dec 12 2025
1 day after the trade
Return, 21 sessionsiFrom the disclosed entry session; derived
–
purchases only
Returns are measured on stock purchases only.
The filer
DDDavid 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.
The name
ATECHealthcare · Alphatec Holdings, Inc., a medical technology company, designs, develops, and advances technologies for the surgical treatment of spinal di…
More Healthcare filings→ Insider filings, newest first→ View the original filing at www.sec.gov→Other filings by David M Demski in ATEC
ATECPURCHASE
Alphatec Holdings, Inc.
$409K60,000 sh × $6.81
Exec Oct 30
Filed Nov 2 · 12:23 PM ET