David M Demski
CIK 1555392 · President, CEO · last filed 2026-11-02
David M Demski is a President, CEO who has filed 48 SEC Form 4 insider transactions across 4 companies since 2012. The most recent filing shows the insider bought $408.6K of ATEC on Nov 2, 2026. Across all open-market trades the lifetime net is −$96.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $12.8M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
GMED price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
1950 CAMINO VIDA ROBLE
CARLSBAD, CA 92008
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ATEC | Director | 491,635 | $7.30 | $3.59M | $633.5K | 10 | 2026-11-02 |
| Paragon 28, Inc. (FNA) Delisted | Director | 0 | $13.09 | $0 | $0 | 2 | 2025-04-21 |
| AXNX | Director | 0 | $1.16 | $0 | $0 | 5 | 2024-11-15 |
| GMED | President, CEO | 121,259 | $75.90 | $9.20M | -$97.20M | 30 | 2022-01-31 |
Recent Filings
48 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-11-02 | ATEC | Buy (P) | +60,000 | $408.6K | EDGAR |
| 2026-06-12 | ATEC | Grant (A) | +32,012 | $0 | EDGAR |
| 2025-12-12 | ATEC | Sell (S) | −30,000 | -$636.0K | EDGAR |
| 2025-12-11 | ATEC | Notice (144) | −30,000 | -$630.5K | EDGAR |
| 2025-06-13 | ATEC | Grant (A) | +15,131 | $0 | EDGAR |
| 2025-04-21 | Paragon 28, Inc. (FNA) Delisted | Disp (D) | −74,307 | $0 | EDGAR |
| 2024-12-18 | ATEC | Grant (A) | +126,051 | $0 | EDGAR |
| 2024-12-12 | Paragon 28, Inc. (FNA) Delisted | Grant (A) | +34,207 | $0 | EDGAR |
| 2024-11-15 | AXNX | Disp (D) | −9,542 | -$677.5K | EDGAR |
| 2024-08-21 | ATEC | Buy (P) | +50,000 | $283.5K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.