NINE Nine Energy Service Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934

(AMENDMENT NO. )

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Nine Energy Service, Inc.

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Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting of 691181-005-Part-2 NINE 06Mar24 ENERGY 22:52 Page SERVICE, 50 INC. To Be Held On: May 3, 2024 at 8:00 a.m., Central Time At 2001 Kirby Drive, Suite 200, Houston, Texas 77019 COMPANY NUMBER JOHN SMITH 1234 MAIN STREET APT. 203 ACCOUNT NUMBER NEW YORK, NY 10038 CONTROL NUMBER This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. If you want to receive a paper or e-mail copy of the proxy materials you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below before 4/19/24. Please visit https://investor.nineenergyservice.com, where the following materials are available for view: • Notice of Annual Meeting of Stockholders • Proxy Statement • Form of Electronic Proxy Card • Annual Report on Form 10-K TO REQUEST MATERIAL: TELEPHONE: 888-Proxy-NA (888-776-9962) or 201-299-6210 (for international callers) E-MAIL: help@equiniti.com WEBSITE: https://us.astfinancial.com/OnlineProxyVoting/ProxyVoting/RequestMaterials TO VOTE: ONLINE: To access your online proxy card, please visit www.voteproxy.com and follow the on-screen instructions or scan the QR code with your smartphone. You may enter your voting instructions at ***.voteproxy.com up until 11:59 PM Eastern Time the day before the cut-off or meeting date. IN PERSON: You may vote your shares in person by attending the Annual Meeting. TELEPHONE: To vote by telephone, please visit www.voteproxy.com to view the materials and to obtain the toll free number to call. MAIL: You may request a card by following the instructions above. 1. Election of Class III Directors 2. Ratification of the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm of the Company for the fiscal year ending December NOMINEES: 31, 2024 Mark E. Baldwin Ernie L. Danner 3. Approval, on an advisory basis, of the compensation of our named executive officers Ann G. Fox 4. Approval, on an advisory basis, of the frequency of future say-on-pay advisory votes THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” ELECTION OF THESE NOMINEES FOR DIRECTOR IN PROPOSAL 1, A VOTE “FOR” PROPOSAL 2, A VOTE “FOR” PROPOSAL 3 AND FOR “1 YEAR” ON PROPOSAL 4. Please note that you cannot use this notice to vote by mail.

Your Vote Counts! NINE ENERGY SERVICE, INC. 2024 Annual Meeting Vote by May 02, 2024 11:59 PM ET Hextone, Inc. P.O. Box 91421 Farmingdale, NY 11735 148,294 322,224 OF 2 Ricky Campana P.O. Box 123456 Suite 500 30# 51 Mercedes Way Edgewood, NY 11717 FLASHID-JOB# You invested in NINE ENERGY SERVICE, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the shareholder meeting to be held on May 03, 2024. Get informed before you vote View the Notice & Proxy Statement, Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 21, 2024. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # XXXX XXXX XXXX XXXX Smartphone users Vote in Person at the Meeting* Point your camera here and May 03, 2024 vote without entering a 8:00 AM CST control number 2001 Kirby Drive Suite 200 Houston, Texas 77019 *If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.ProxyVote.com or request a paper copy of the materials, which will contain the appropriate instructions. Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com Control # XXXX XXXX XXXX XXXX THIS IS NOT A VOTABLE BALLOT NINE ENERGY SERVICE, INC. This is an overview of the proposals being presented at the 2024 Annual Meeting Vote by May 02, 2024 upcoming shareholder meeting. Please follow the instructions on 11:59 PM ET the reverse side to vote these important matters. Voting Items Board Recommends 1. Election of Directors Nominees: For 01 Mark E. Baldwin 02 Ernie L. Danner 03 Ann G. Fox 2 Ratification of the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting For firm of the Company for the fiscal year ending December 31, 2024 3 Approval, on an advisory basis, of the compensation of our named executive officers For 4 Approval, on an advisory basis, of the frequency of future say-on-pay advisory votes Year NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Under New York Stock Exchange rules, brokers may vote “routine” matters at their discretion if your voting instructions are not communicated to us at least 10 days before the meeting. We will nevertheless follow your instructions, even if the broker’s discretionary vote has already been given, provided your instructions are received prior to the meeting date.