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David M Demski is Director at Alphatec Holdings. OQRO lists 1 transaction filed with the SEC under this name, the latest on Nov 2, 2026, each linked to the official Form 4.
Director
Disclosures on record
1
Companies involved
1
As of the latest filing on , David M Demski reported holding 491,635 shares of Alphatec Holdings (ATEC), worth about $3.48M at the last close of $7 (Nov 13, 2026). In the last 12 months, David M Demski bought $409K in 1 open-market purchase.
| Company | Shares reported | How held | Last close | Value at last close | Reported |
|---|---|---|---|---|---|
| Alphatec Holdings ATEC | 491,635 | 492K direct | $7 | $3.48M | Oct 30, 2026 |
Is this David M Demski’s net worth? No. A Form 4 reports the shares an insider owns in one company after each transaction, directly or through trusts and entities. It says nothing about cash, other investments, property or debt, options not yet exercised are not counted here, and a holding reported some time ago may have changed without a new filing. The value is shares times the last stored close, not a price anyone received. Sources: the filings listed below, each linked to EDGAR. Compare with the biggest insider stakes.
1 purchase disclosed. $1,000 placed after each of the 1 purchases disclosed since 2025-11-14 would be worth $946 today ($1K put in); the same in the S&P 500 (SPY): $1K.
Not ranked: fewer than 10 purchases measured at 90 days. The middle of the 82 ranked insiders is −5.5 pts (median, against the S&P 500).
Equal weight counts every purchase once; by size counts it for its disclosed dollars. Both are measured from the first close after it was reported. Past results describe the past, not a forecast. How this is measured · Leaderboard
Oct 30, 2026Bought~$409Kdisclosed Nov 2
DetailsOfficial recordDavid M Demski bought shares on the open market in 2023, 2024 and 2026 across 2 companies. Sales in 7 of the 15 years since 2012.
David M Demski reported 4 open-market purchases and 35 sales since 2012; purchases in 3 different years, most recently 2026.
| Year | Bought | Sold |
|---|---|---|
| 2026 | $409K1×1 trade | — |
| 2024 | $546K2×2 trades | — |
| 2023 | $315K1×1 trade | — |
| 2021 | — | $19M2×2 trades |
| 2020 | — | $32.5M5×5 trades |
| 2018 | — | $10.2M9×9 trades |
| 2015 | — | $845K1×1 trade |
| 2014 | — | $9M3×3 trades |
| 2013 | — | $5.91M14×14 trades |
| 2012 | — | $1.1M1×1 trade |
Open-market purchases (code P) and sales (code S) on Forms 4 and 5. Up to Sep 2024 from the SEC's Insider Transactions Data Sets; since Oct 2024 from each filing as it is published. A trade filed twice (an amendment) counts once. Dollar totals use the price the filer reported; lines with no price count as trades without a value.
On the latest SEC Form 4, dated Oct 30, 2026, David M Demski reported holding 491,635 shares of Alphatec Holdings (ATEC). At the last close of $7 on Nov 13, 2026, that is about $3.48M. This is the stake disclosed in filings, not a net worth.
In SEC filings of the last 12 months, David M Demski reported 1 open-market purchase worth $409K, and no open-market sale. Shares withheld for taxes, gifts and option exercises are not counted in these totals.
David M Demski bought shares on the open market in 2023, 2024 and 2026 across 2 companies. Sales in 7 of the 15 years since 2012.
In SEC filings since 2012: the latest open-market purchase is from 2026; the latest open-market sale is from 2021.
2 companies: Alphatec Holdings (ATEC, 2023–2026), Globus Medical (GMED, 2012–2021).
David M Demski reported 0 open-market purchases and 35 sales here, 2012 to 2021.
David M Demski reported 4 open-market purchases and 0 sales here, 2023 to 2026.
Closing prices and the companies' last annual figures; a − or + is a fact of the close, not a forecast.
