SEC Form 4 · Updated Daily

NPKI

— NPK INTERNATIONAL INC. Ownership

Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.

Financials Ownership

Current Reporting Owners

Owner	Role	Shares Owned	As Of	Last Activity
Piontek Gregg	Officer	858,182	2026-06-01	M
WHITE DOUGLAS L	Officer	305,245	2025-06-14	A
Fruge Mary Celeste	Officer	284,641	2026-06-01	M
LANIGAN MATTHEW	Director · Officer	254,699	2026-06-03	S
MINGE JOHN C	Director	253,942	2026-05-20	A
Briggs Lori	Officer	247,165	2026-06-08	S
ROBESON ROSE M	Director	215,147	2026-08-27	S
Lewis Michael A	Director	135,865	2026-08-17	S
Meer Claudia Michel	Director	126,693	2026-05-20	A
Warren Matthew James	Officer	51,439	2026-09-09	S
CUTILLO JOSEPH A	Director	36,155	2026-05-20	A
LARSON RODERICK A.	Director	23,655	2026-05-20	A
Pederson Kristen J.	Director	6,614	2026-07-28	A

Recent Filings

Date	Owner	Activity	Shares	Price	Owned After
2026-09-09	Warren Matthew James	Open-market sale	2,991	$13.41	51,439
2026-08-27	ROBESON ROSE M	Open-market sale	10,000	$13.49	215,147
2026-08-17	Lewis Michael A	Open-market sale	2,013	$14.26	135,865
2026-07-28	Pederson Kristen J.	Grant / award	6,614	$0.00	6,614
2026-06-08	Briggs Lori	Open-market sale	8,325	$14.75	247,165
2026-06-03	LANIGAN MATTHEW	Open-market sale	167,375	$14.43	254,699
2026-06-02	Briggs Lori	Open-market sale	10,446	$14.58	255,490
2026-06-01	Briggs Lori	Option exercise (derivative)	24,340	$0.00	0
2026-06-01	Briggs Lori	Option exercise	24,340	$0.00	265,936
2026-06-01	Briggs Lori	Tax withholding	6,777	$14.31	241,596
2026-06-01	Briggs Lori	Tax withholding	9,577	$14.31	248,373
2026-06-01	Briggs Lori	Tax withholding	5,401	$14.31	257,950
2026-06-01	Piontek Gregg	Option exercise (derivative)	40,379	$0.00	0
2026-06-01	Piontek Gregg	Option exercise	40,379	$0.00	858,182
2026-06-01	Piontek Gregg	Tax withholding	11,241	$14.31	817,803
2026-06-01	Piontek Gregg	Tax withholding	15,889	$14.31	829,044
2026-06-01	Piontek Gregg	Tax withholding	8,959	$14.31	844,933
2026-06-01	LANIGAN MATTHEW	Option exercise (derivative)	100,188	$0.00	0
2026-06-01	LANIGAN MATTHEW	Option exercise	100,188	$0.00	422,074
2026-06-01	LANIGAN MATTHEW	Tax withholding	39,423	$14.31	321,886
2026-06-01	LANIGAN MATTHEW	Tax withholding	27,894	$14.31	361,309
2026-06-01	LANIGAN MATTHEW	Tax withholding	22,232	$14.31	389,203
2026-06-01	Fruge Mary Celeste	Option exercise (derivative)	17,274	$0.00	0
2026-06-01	Fruge Mary Celeste	Option exercise	17,274	$0.00	284,641
2026-06-01	Fruge Mary Celeste	Tax withholding	6,797	$14.31	267,367
2026-06-01	Fruge Mary Celeste	Tax withholding	5,218	$14.31	274,164
2026-06-01	Fruge Mary Celeste	Tax withholding	3,833	$14.31	279,382
2026-05-20	CUTILLO JOSEPH A	Grant / award	8,558	$0.00	36,155
2026-05-20	LARSON RODERICK A.	Grant / award	8,558	$0.00	23,655
2026-05-20	Lewis Michael A	Grant / award	8,558	$0.00	137,878
2026-05-20	Meer Claudia Michel	Grant / award	8,558	$0.00	126,693
2026-05-20	MINGE JOHN C	Grant / award	8,558	$0.00	253,942
2026-05-20	ROBESON ROSE M	Grant / award	10,862	$0.00	225,147
2026-05-19	Briggs Lori	Grant / award	20,838	$0.00	263,351
2026-05-19	Fruge Mary Celeste	Grant / award	18,002	$0.00	283,215
2026-05-19	LANIGAN MATTHEW	Grant / award	85,771	$0.00	411,435
2026-05-19	Piontek Gregg	Grant / award	34,566	$0.00	853,892
2026-05-15	Lewis Michael A	Open-market sale	2,013	$15.30	129,320
2026-04-09	Piontek Gregg	Open-market sale	15,000	$15.04	819,326
2026-04-01	Piontek Gregg	Open-market sale	35,000	$14.51	834,326

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.