UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 10, 2025

NPK International Inc.

(Exact name of registrant as specified in its charter)


Delaware	001-02960	72-1123385
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)


9320 Lakeside Boulevard,	Suite 100
The Woodlands,	Texas	77381
(Address of principal executive offices)		(Zip Code)

Registrant's telephone number, including area code: (281) 362-6800


Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:


☐			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)


☐			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)


☐			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))


☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13a-4(c))

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.01 par value	NPKI	New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On November 10, 2025, NPK International Inc. (the “Company”) announced that Gregg S. Piontek, age 55, the Company’s Senior Vice President and Chief Financial Officer will be assuming the role of the Company’s principal accounting officer effective immediately. As part of the Company’s efforts to streamline the organization and cost structure, Douglas L. White, the Company’s Vice President, Chief Accounting Officer and Treasurer, will step down from his Chief Accounting Officer role on such date and will continue as a non-executive employee to assist in the transition of his role and responsibilities through Spring 2026.

Mr. Piontek has served as the Company’s Chief Financial Officer since October 2011. He joined the Company in April 2007 as Vice President, Controller and Chief Accounting Officer and served in this capacity until October 2011. Before joining the Company, Mr. Piontek served in various financial roles for Stewart & Stevenson Services, Inc. and Stewart & Stevenson, LLC from June 2001 through March 2007, including Divisional Controller, Assistant Corporate Controller and as Vice President and Chief Accounting Officer. Prior to that, Mr. Piontek served in various financial roles at General Electric, CNH Global N.V. and Deloitte & Touche LLP.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.


Exhibit No.						Description
104						Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


		NPK International Inc.
		(Registrant)

Date:	November 12, 2025	By:	/s/ M. Celeste Frugé
			M. Celeste Frugé
			VP, General Counsel, Chief Compliance Officer & Corporate Secretary

NPK International Inc. 8-K