M. Celeste Fruge - 06 Mar 2026 Form 4 Insider Report for NPK International Inc. (NPKI)

Role: VP, General Counsel
Signature: M. Celeste Fruge
Issuer symbol: NPKI
Transactions as of: 06 Mar 2026
Net transactions value: -$149,303
Form type: 4
Filing time: 10 Mar 2026, 16:29:24 UTC
Previous filing: 21 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Fruge Mary Celeste	VP, General Counsel	9320 LAKESIDE BOULEVARD, SUITE 100, THE WOODLANDS	M. Celeste Fruge	10 Mar 2026	0001975485

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	NPKI	Common Stock	Options Exercise		+11,193	+4.2%	$4.32^*	276,406	06 Mar 2026	Direct	F1
transaction	NPKI	Common Stock	Sale	$149,303	-11,193	-4%	$13.34	265,213	06 Mar 2026	Direct	F1, 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		-11,193	-92%	$0.000000^*	1,000	06 Mar 2026	Common Stock	11,193	$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 exercise of 11,193 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.
F2	The price reported is the weighted average price. These options were sold in multiple transactions in the open market at prices ranging from $13.24 to $13.48, 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 options sold at each separate price within the range set forth in footnote (2) to this Form 4.

Content

The reported exercise of 11,193 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.

The price reported is the weighted average price. These options were sold in multiple transactions in the open market at prices ranging from $13.24 to $13.48, 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 options sold at each separate price within the range set forth in footnote (2) to this Form 4.