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John Todd Koning

CIK 1830843 · CHIEF FINANCIAL OFFICER · last filed 2026-03-17

John Todd Koning is a CHIEF FINANCIAL OFFICER who has filed 28 SEC Form 4 insider transactions across 2 companies since 2021. The most recent filing shows the insider sold $986.2K of ATEC on Mar 17, 2026. Across all open-market trades the lifetime net is −$5.8M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $5.7M across reported positions. 2 SEC filings were submitted jointly with MASIMO CORP.

"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

$5.68M

Companies

2

Total Filings

28

Lifetime Open-Market Net

-$5.82M

Filer Profile

Reported Address
C/O ALPHATEC HOLDINGS, INC.
1950 CAMINO VIDA ROBLE
CARLSBAD, CA 92008
Related Filers
MASIMO CORP — 2 joint filings, latest 2021-03-02
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

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 CHIEF FINANCIAL OFFICER 600,721 $9.45 $5.68M -$5.82M 22 2026-03-17
MASIMO CORP (MASI) Delisted SVP, Chief Accounting Officer — $179.95 — $0 1 2021-03-02

Recent Filings

28 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
2026-03-17 ATEC Sell (S) −79,789 -$986.2K EDGAR
2026-03-13 ATEC Notice (144) −79,789 -$997.4K EDGAR
2026-03-09 ATEC Tax (F) −68,910 -$866.2K EDGAR
2026-02-27 ATEC Grant (A) +335,868 $0 EDGAR
2025-12-10 ATEC Tax (F) −15,266 -$327.5K EDGAR
2025-08-07 ATEC Tax (F) −5,315 -$81.5K EDGAR
2025-04-23 ATEC Sell (S) −37,500 -$401.6K EDGAR
2025-04-03 ATEC Grant (A) +20,929 $0 EDGAR
2025-03-12 ATEC Sell (S) −165,121 -$1.60M EDGAR
2025-03-10 ATEC Notice (144) −202,621 -$2.12M EDGAR
Showing 1–10 of 28
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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.