Home

DOUGLAS T DIETRICH

CIK 1408736 · CHAIRMAN AND CEO · last filed 2026-05-28

DOUGLAS T DIETRICH is a CHAIRMAN AND CEO who has filed 90 SEC Form 4 insider transactions across 2 companies since 2008. The most recent filing, for KMT, was dated May 28, 2026. Across all open-market trades the lifetime net is −$9.0M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $15.3M 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.

Loading insider history…
Disclosed Exposure

$15.26M

Companies

2

Total Filings

90

Lifetime Open-Market Net

-$8.98M

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
KMT Director 841 $35.61 $29.9K $0 9 2026-05-28
MTX CHAIRMAN AND CEO 202,276 $75.28 $15.23M -$8.98M 77 2026-05-18

Recent Filings

90 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
2026-05-28 KMT Grant (A) — $0 EDGAR
2026-05-18 MTX Mixed — -$75.6K EDGAR
2026-05-14 MTX Notice (144) −21,568 -$1.76M EDGAR
2026-02-26 KMT Grant (A) — $0 EDGAR
2026-02-03 KMT Mixed +816 $28.1K EDGAR
2026-01-27 MTX Mixed +9,895 -$842.8K EDGAR
2026-01-23 MTX Mixed +4,403 -$376.8K EDGAR
2026-01-22 MTX Grant (A) — $0 EDGAR
2025-11-25 KMT Grant (A) — $0 EDGAR
2025-08-27 KMT Grant (A) — $0 EDGAR
Showing 1–10 of 90
Page 1 of 9
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.