Exhibit 32.1

CERTIFICATION OF

CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE

SARBANES OXLEY ACT OF 2002

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in connection with the Quarterly Report of KLX Energy Services Holdings, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Periodic Report”), I, Christopher J. Baker, as President and Chief Executive Officer of the Company, hereby certify that:

(1)the Periodic Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)the information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: October 31, 2024	/s/ Christopher J. Baker
	Christopher J. Baker
	President and Chief Executive Officer
	(Principal Executive Officer)