MATTHEW LANIGAN - 22 Aug 2025 Form 4 Insider Report for NPK International Inc. (NPKI)

Role: President & CEO, Director
Signature: By: M. Celeste Fruge For: Matthew Lanigan
Issuer symbol: NPKI
Transactions as of: 22 Aug 2025
Transactions value $: -$1,127,442
Form type: 4
Filing time: 26 Aug 2025, 17:22:03 UTC
Previous filing: 03 Jun 2025
Next filing: 04 Sep 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
LANIGAN MATTHEW	President & CEO, Director	9320 LAKESIDE BOULEVARD, SUITE 100, THE WOODLANDS	By: M. Celeste Fruge For: Matthew Lanigan	26 Aug 2025	0001672978

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	NPKI	Common Stock	Options Exercise	$297,630	+68,896	+6.3%	$4.32	1,164,809	22 Aug 2025	Direct	F1
transaction	NPKI	Common Stock	Sale	-$712,536	-68,896	-5.9%	$10.34	1,095,913	22 Aug 2025	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	NPKI	Non-Qualified Stock Option (right to buy)	Options Exercise	-$712,536	-68,896	-99%	$10.34	1,000	22 Aug 2025	Common Stock	68,896	$4.32	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id	Content
F1	The reported sale of 68,896 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 23, 2025.
F2	The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $9.97 to $10.42, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

Content

The reported sale of 68,896 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 23, 2025.

The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $9.97 to $10.42, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.