DIETRICH DOUGLAS T

CHAIRMAN AND CEO at MINERALS TECHNOLOGIES INC · on record since Jan 24, 2013
Director at MINERALS TECHNOLOGIES INC · on record since May 18, 2026
Director at KENNAMETAL INC · on record since May 28, 2026

Insider trading activity of DIETRICH DOUGLAS T

Transactions on record: 264; since Feb 29, 2008

Open-market buys: 6; $224.2K

Open-market sells: 11; $9.2M

Companies traded: 2; last filing Aug 26, 2026

Figures computed from official regulatory filings — .

Companies where DIETRICH DOUGLAS T has traded

KENNAMETAL INC13 tx · $190.9K · Aug 26, 2026
MINERALS TECHNOLOGIES INC251 tx · $27.7M · May 18, 2026

Track record of DIETRICH DOUGLAS T

Statistical track record

Free account

Open-market buys: 6

Last buy: Apr 30, 2025

Win rates, median returns and the proven-insider analysis come with a free account.

Create a free account

Transaction history of DIETRICH DOUGLAS T

Co-insiders of DIETRICH DOUGLAS T

ALBERDING RICHARD CKENNAMETAL INC
ALDAG ERIKMINERALS TECHNOLOGIES INC
ALVARADO JOSEPHKENNAMETAL INC

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
KENNAMETAL INCListing on record	Aug 26, 2026	AwardD (derivative)	982.23	29.27 USD	$28.7K	Unusual size	SEC
KENNAMETAL INCListing on record	Aug 18, 2026	AwardD (derivative)	4,965	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	May 28, 2026	AwardD (derivative)	697.08	36.94 USD	$25.7K	Unusual size	SEC
MINERALS TECHNOLOGIES INCListing on record	May 18, 2026	Exercise	21,568	78.03 USD	$1.7M	Unusual size	SEC
MINERALS TECHNOLOGIES INCListing on record	May 18, 2026	Sell	-21,568	81.53 USD	$1.8M		SEC
MINERALS TECHNOLOGIES INCListing on record	May 18, 2026	ExerciseD (derivative)	-21,568	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	Feb 26, 2026	AwardD (derivative)	642.15	40.10 USD	$25.8K	Unusual size	SEC
KENNAMETAL INCListing on record	Feb 3, 2026	Exercise	841	34.39 USD	$28.9K		SEC
KENNAMETAL INCListing on record	Feb 3, 2026	ExerciseD (derivative)	-841	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	Feb 3, 2026	Other	-25	34.39 USD	$859.8	Unusual size	SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	ExerciseD (derivative)	-11,016	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	Other	-6,092	68.77 USD	$418.9K		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	Exercise	11,123	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	Exercise	11,016	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	ExerciseD (derivative)	-11,123	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	Other	-6,152	68.89 USD	$423.8K		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 23, 2026	Other	-5,630	66.92 USD	$376.8K		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 23, 2026	Exercise	10,033	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 23, 2026	ExerciseD (derivative)	-10,033	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 22, 2026	AwardD (derivative)	39,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 22, 2026	AwardD (derivative)	33,494	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	Nov 25, 2025	AwardD (derivative)	893.07	27.12 USD	$24.2K	Unusual size	SEC
KENNAMETAL INCListing on record	Aug 27, 2025	AwardD (derivative)	991.14	21.44 USD	$21.3K	Unusual size	SEC
KENNAMETAL INCListing on record	Aug 18, 2025	AwardD (derivative)	6,898	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	May 29, 2025	AwardD (derivative)	977.46	21.74 USD	$21.2K	Unusual size	SEC

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
KENNAMETAL INCListing on record	Aug 26, 2026	AwardD (derivative)	982.23	29.27 USD	$28.7K	Unusual size	SEC
KENNAMETAL INCListing on record	Aug 18, 2026	AwardD (derivative)	4,965	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	May 28, 2026	AwardD (derivative)	697.08	36.94 USD	$25.7K	Unusual size	SEC
MINERALS TECHNOLOGIES INCListing on record	May 18, 2026	Exercise	21,568	78.03 USD	$1.7M	Unusual size	SEC
MINERALS TECHNOLOGIES INCListing on record	May 18, 2026	Sell	-21,568	81.53 USD	$1.8M		SEC
MINERALS TECHNOLOGIES INCListing on record	May 18, 2026	ExerciseD (derivative)	-21,568	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	Feb 26, 2026	AwardD (derivative)	642.15	40.10 USD	$25.8K	Unusual size	SEC
KENNAMETAL INCListing on record	Feb 3, 2026	Exercise	841	34.39 USD	$28.9K		SEC
KENNAMETAL INCListing on record	Feb 3, 2026	ExerciseD (derivative)	-841	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	Feb 3, 2026	Other	-25	34.39 USD	$859.8	Unusual size	SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	ExerciseD (derivative)	-11,016	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	Other	-6,092	68.77 USD	$418.9K		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	Exercise	11,123	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	Exercise	11,016	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	ExerciseD (derivative)	-11,123	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 27, 2026	Other	-6,152	68.89 USD	$423.8K		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 23, 2026	Other	-5,630	66.92 USD	$376.8K		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 23, 2026	Exercise	10,033	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 23, 2026	ExerciseD (derivative)	-10,033	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 22, 2026	AwardD (derivative)	39,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
MINERALS TECHNOLOGIES INCListing on record	Jan 22, 2026	AwardD (derivative)	33,494	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	Nov 25, 2025	AwardD (derivative)	893.07	27.12 USD	$24.2K	Unusual size	SEC
KENNAMETAL INCListing on record	Aug 27, 2025	AwardD (derivative)	991.14	21.44 USD	$21.3K	Unusual size	SEC
KENNAMETAL INCListing on record	Aug 18, 2025	AwardD (derivative)	6,898	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
KENNAMETAL INCListing on record	May 29, 2025	AwardD (derivative)	977.46	21.74 USD	$21.2K	Unusual size	SEC