Gregg Piontek

CIK: 0001418328

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)5 (29.4%)

Position reduction

Option Exercises (M)4 (23.5%)

Derivative conversions

Awards (A)2 (11.8%)

Compensation grants

Other (G, F, J, C, D, …)6 (35.3%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

NPKI

NPK International Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (17 total)

NPKI
NPK International Inc.
Jun 1, 2026
Tax Payment(F)
Direct
11.2K shares at avg. $14.31$161K
NPKI
NPK International Inc.
Jun 1, 2026
Tax Payment(F)
Direct
15.9K shares at avg. $14.31$227K
NPKI
NPK International Inc.
Jun 1, 2026
Tax Payment(F)
Direct
9K shares at avg. $14.31$128K
NPKI
NPK International Inc.
Jun 1, 2026
Exercise(M)
Direct
40.4K shares-
NPKI
NPK International Inc.
May 19, 2026
Award(A)
Direct
34.6K shares-
NPKI
NPK International Inc.
Apr 9, 2026
Sale(S)
Direct
15K shares at avg. $15.04$226K
NPKI
NPK International Inc.
Apr 1, 2026
Sale(S)
Direct
35K shares at avg. $14.51$508K
NPKI
NPK International Inc.
Mar 25, 2026
Sale(S)
Direct
15K shares at avg. $15.03$225K
NPKI
NPK International Inc.
Mar 4, 2026
Sale(S)
Direct
35K shares at avg. $14.02$491K
NPKI
NPK International Inc.
Mar 4, 2026
Exercise(M)
Direct
73.6K shares at avg. $4.32$318K
NPKI
NPK International Inc.
Mar 4, 2026
Sale(S)
Direct
73.6K shares at avg. $14.10$1.0M
NPKI
NPK International Inc.
Jun 1, 2025
Exercise(M)
Direct
43.8K shares-
NPKI
NPK International Inc.
Jun 1, 2025
Exercise(M)
Direct
40.4K shares-
NPKI
NPK International Inc.
Jun 1, 2025
Tax Payment(F)
Direct
9K shares at avg. $8.09$72K
NPKI
NPK International Inc.
Jun 1, 2025
Tax Payment(F)
Direct
15.9K shares at avg. $8.09$129K
NPKI
NPK International Inc.
Jun 1, 2025
Tax Payment(F)
Direct
17.2K shares at avg. $8.09$139K
NPKI
NPK International Inc.
May 14, 2025
Award(A)
Direct
85.7K shares-

		Type	Shares	Price		Ownership
Jun 1, 2026	NPKI NPK International Inc.	Tax Payment(F)	11,241	$14.31	$160,859	Direct
Jun 1, 2026	NPKI NPK International Inc.	Tax Payment(F)	15,889	$14.31	$227,372	Direct
Jun 1, 2026	NPKI NPK International Inc.	Tax Payment(F)	8,959	$14.31	$128,203	Direct
Jun 1, 2026	NPKI NPK International Inc.	Exercise(M)	40,379	-	$0	Direct
May 19, 2026	NPKI NPK International Inc.	Award(A)	34,566	-	$0	Direct
Apr 9, 2026	NPKI NPK International Inc.	Sale(S)	15,000	$15.04	$225,675	Direct
Apr 1, 2026	NPKI NPK International Inc.	Sale(S)	35,000	$14.51	$507,864	Direct
Mar 25, 2026	NPKI NPK International Inc.	Sale(S)	15,000	$15.03	$225,384	Direct
Mar 4, 2026	NPKI NPK International Inc.	Sale(S)	35,000	$14.02	$490,592	Direct
Mar 4, 2026	NPKI NPK International Inc.	Exercise(M)	73,590	$4.32	$317,909	Direct
Mar 4, 2026	NPKI NPK International Inc.	Sale(S)	73,590	$14.10	$1,037,464	Direct
Jun 1, 2025	NPKI NPK International Inc.	Exercise(M)	43,790	-	-	Direct
Jun 1, 2025	NPKI NPK International Inc.	Exercise(M)	40,379	-	-	Direct
Jun 1, 2025	NPKI NPK International Inc.	Tax Payment(F)	8,959	$8.09	$72,478	Direct
Jun 1, 2025	NPKI NPK International Inc.	Tax Payment(F)	15,889	$8.09	$128,542	Direct
Jun 1, 2025	NPKI NPK International Inc.	Tax Payment(F)	17,231	$8.09	$139,399	Direct
May 14, 2025	NPKI NPK International Inc.	Award(A)	85,706	-	-	Direct

1-17 of 17 transactions

About Piontek Gregg

Piontek Gregg (SEC CIK 0001418328) files insider reports with the SEC as Senior Vice President and CFO of NPK International Inc. (NPKI).

Signal8 holds 8 ownership filings by Piontek Gregg, all Form 4s, filed between May 16, 2025 and Jun 3, 2026. Those filings report 17 transactions, from May 14, 2025 to Jun 1, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Piontek Gregg's filings is in THE WOODLANDS, TX.

Recent filings by Piontek Gregg

Jun 1, 2026: Tax withholdings of NPKI shares (3 lines, Form 4, code F).
Jun 1, 2026: Option exercise of NPKI shares (Form 4, code M).
May 19, 2026: Grant or award of NPKI shares (Form 4, code A).
Apr 9, 2026: Open-market sale of NPKI shares (Form 4, code S).
Apr 1, 2026: Open-market sale of NPKI shares (Form 4, code S).

Other insiders filing for NPK International Inc. (NPKI)

MINGE JOHN C, Director
Barton III Alvin James, EVP Commercial Growth & Ops.
Warren Matthew James, Chief Accounting Officer
ROBESON ROSE M, Director
Lewis Michael A, Director
Pederson Kristen J., Director

How to read Form 4 transaction codes