KLX Energy Services Holdings, Inc.

Additions to the Amended and Restated Certificate of Incorporation pursuant the Charter Supermajority Amendment contemplated by Proposal 5 are indicated below by bold, underlined text and deletions contemplated thereby are indicated below bystrike-out text. The full text of the Company’s currently applicable Amended and Restated Certificate of Incorporation was filed as an exhibit to the Company’s Quarterly Report on Form 10-Q filed with the SEC on September 8, 2020.

The proposed Charter Supermajority Amendment changes to Article X are set forth below:

(2) Notwithstanding anything contained in this Certificate of Incorporation to the contrary, and in addition to any affirmative vote of the holders of any particular class of stock of the Corporation required by applicable law or this Certificate of Incorporation, the affirmative vote of at least sixty-six andtwo-thirds percent (66 2/3%) a majority of the voting power of the then-outstanding voting stock of the Corporation, voting together as a single class, shall be required for our stockholders to amend, repeal or adopt any provisions of this Certificate of Incorporation inconsistent with Article V, paragraphs (2) and (4) of Article VII, or this Article X of this Certificate of Incorporation.

Using a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas. Your vote matters – here’s how to vote! You may vote online or by phone instead of mailing this card. Online Go to www.investorvote.com/KLXE or scan the QR code — login details are located in the shaded bar below. Phone Call toll free 1-800-652-VOTE (8683) within the USA, US territories and Canada Save paper, time and money! Sign up for electronic delivery at www.investorvote.com/KLXE. T IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE.T To approve an amendment to the Amended and Restated Certificate of Incorporation of the Company (the “Amended and Restated Certificate of Incorporation”) to declassify the Board; For Against Abstain To elect two Class II Directors, each for a term that expires at the 2029 Annual Meeting of Stockholders (or until the 2027 Annual Meeting of Stockholders if Proposal 1 is approved and the Declassification Amendment (as defined in the accompanying proxy statement (the “Proxy Statement”)) is filed and becomes effective as described in the Proxy Statement) and until such director’s successor is duly elected or qualified; For Withhold For Withhold 01—John T. Collins 02—Danielle E. Hunter To approve, on an advisory, non-binding basis, the compensation of the Company’s named executive officers; 5. To approve an amendment to the Amended and Restated Certificate of Incorporation to eliminate the supermajority voting requirement to amend the Company’s certificate of incorporation; and For Against Abstain To approve an amendment to the Amended and Restated Certificate of Incorporation to eliminate the supermajority voting requirement to amend the Company’s bylaws; 6. To ratify the selection of Deloitte & Touche LLP to serve as the Company’s independent auditor for the fiscal year ending December 31, 2026. For Against Abstain Note: To take action as appropriate upon such other matters that may be properly presented at the Annual Meeting or at any and all adjournments or postponements thereof. Please sign exactly as name(s) appears hereon. Joint owners should each sign. When signing as attorney, executor, administrator, corporate officer, trustee, guardian, or custodian, please give full title. Date (mm/dd/yyyy) — Please print date below. Signature 1 — Please keep signature within the box. Signature 2 — Please keep signature within the box. 1 U P X 049J7A

2026 Annual Meeting of Stockholders of KLX Energy Services Holdings, Inc. The 2026 Annual Meeting of Stockholders of KLX Energy Services Holdings, Inc. will be held on Wednesday, May 6, 2026 at approximately 9:00 a.m., CDT virtually via the Internet at meetnow.global/MXZW7V6. To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. T IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE.T Notice of 2026 Annual Meeting of Stockholders—May 6, 2026 This proxy is solicited on behalf of the Board of Directors of KLX Energy Services Holdings, Inc. The above signed hereby constitutes and appoints Messrs. Christopher J. Baker and Max L. Bouthillette, or either of them, with full power of substitution each, proxies to vote and act at the Annual Meeting of Stockholders of KLX Energy Services Holdings, Inc. (the “Company”) to be held May 6, 2026 virtually via the Internet at meetnow.global/MXZW7V6 and at any postponement or adjournment thereof (the “Annual Meeting”), upon and with respect to the number of shares of Company common stock, par value $0.01 per share, that the above signed would be entitled to vote if personally present. The above signed hereby instructs such proxies, or their substitutes, to vote on those matters appearing on the reverse side of this proxy card as specified by the above signed and in such manner as the proxies may determine on any other matter that may come before the Annual Meeting, all as indicated in the accompanying Proxy Statement, receipt of which is hereby acknowledged. All proxies previously given by the above signed in respect of the Annual Meeting are hereby revoked. Unless otherwise specified in the boxes provided on the reverse side of this proxy card, the Proxy will be voted FOR Proposals 1 and 3—6, FOR each of the nominees listed in Proposal 2, and in the discretion of the named proxies as to any other matter that may properly come before the Annual Meeting. CONTINUED AND TO BE VOTED ON REVERSE SIDE Change of Address — Please print new address below. Comments — Please print your comments below. If voting by mail, you must complete sections A—C on both sides of this card.