Company: NINE
Filing Date: 2025-03-06
Form Type: DEFA14A
Source: 0001193125-25-048518
Chunk: 0

Company: Nine Energy Service, Inc.
Filing Date: 2025-03-06
Form: DEFA14A
Chunk 0
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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. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 
 14a-6(e)(2))                                                       |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Material |

| ☐ | Soliciting Material under §240.14a-12 |

Nine Energy Service, Inc. (Name of Registrant as Specified in its Charter) N/A (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant) Payment of Filing Fee (Check all boxes that apply):

| ☒ | No fee required |

| ☐ | Fee paid previously with preliminary materials |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 
 14a-6(i)(1) and 0-11                                                           |

Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting of NINE ENERGY SERVICE,INC. To Be Held On: May 2, 2025 at 8:00 a.m., Central Time At 2001 Kirby Drive, Suite 200, Houston, Texas 77019 COMPANY NUMBER ACCOUNT NUMBER CONTROL NUMBERThis 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-mailcopy 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 4/17/25. Please visit https://investor.nineenergyservice.com, where the following materials are available for view:• Proxy Statement • Form of Electronic Proxy Card • Annual Report 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/ProxyV