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MARTIN J. VANDERPLOEG

CIK 1014008 · CEO · last filed 2026-06-03

MARTIN J. VANDERPLOEG is a CEO who has filed 70 SEC Form 4 insider transactions across 1 company since 2015. The most recent filing, for WK, was dated Jun 3, 2026. Across all open-market trades the lifetime net is −$348.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $48.8M 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.

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Disclosed Exposure

$48.84M

Companies

1

Total Filings

70

Lifetime Open-Market Net

-$348.41M

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
WK Director 728,090 $67.08 $48.84M -$348.41M 70 2026-06-03

Recent Filings

70 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
2026-06-03 WK Mixed −24,872 -$1.53M EDGAR
2026-02-03 WK Mixed −560 -$43.1K EDGAR
2025-06-02 WK Mixed +3,218 $0 EDGAR
2025-04-17 WK Exer (M) +84,210 $1.24M EDGAR
2025-02-24 WK Mixed +2,390 -$37.9K EDGAR
2025-02-04 WK Tax (F) −2,886 -$283.5K EDGAR
2025-01-14 WK Gift (G) — $0 EDGAR
2024-09-13 WK Buy (P) +4,000 $280.2K EDGAR
2024-09-04 WK Tax (F) −2,071 -$161.9K EDGAR
2024-08-19 WK Buy (P) +4,000 $315.6K EDGAR
Showing 1–10 of 70
Page 1 of 7
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.