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David M Demski

CIK 1555392 · President, CEO · last filed 2026-06-12

David M Demski is a President, CEO who has filed 47 SEC Form 4 insider transactions across 4 companies since 2012. The most recent filing, for ATEC, was dated Jun 12, 2026. Across all open-market trades the lifetime net is −$97.0M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $14.5M 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.

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Disclosed Exposure

$14.54M

Companies

4

Total Filings

47

Lifetime Open-Market Net

-$96.98M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
ATEC Director 431,635 $9.49 $4.10M $224.9K 9 2026-06-12
Paragon 28, Inc. (FNA) Delisted Director 0 $13.09 $0 $0 2 2025-04-21
Axonics, Inc. (AXNX) Delisted Director 0 $70.98 $0 $0 5 2024-11-15
GMED President, CEO 121,259 $86.15 $10.45M -$97.20M 30 2022-01-31

Recent Filings

47 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
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 Axonics, Inc. (AXNX) Delisted Disp (D) −9,542 -$677.5K EDGAR
2024-08-21 ATEC Buy (P) +50,000 $283.5K EDGAR
2024-08-05 ATEC Buy (P) +40,000 $262.4K EDGAR
Showing 1–10 of 47
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.