Company: NINE
Filing Date: 2025-05-07
Form Type: S-8
Source: 0001193125-25-115076
Chunk: 0

Company: Nine Energy Service, Inc.
Filing Date: 2025-05-07
Form: S-8
Chunk 0
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As filed with the Securities and Exchange Commission on May 7, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NINE ENERGY SERVICE, INC. (Exact name of registrant as specified in its charter)

| Delaware                                |     |         80-0759121 |
| (State or other jurisdiction of         
 incorporation or organization)          |     |   -I.R.S. Employer 
 Identification No. |
| 2001 Kirby Drive, Suite 200             
 Houston, Texas                          |     |              77019 |
| (Address of Principal Executive Office) |     |          -Zip Code |

NINE ENERGY SERVICE, INC. 2011 STOCK INCENTIVE PLAN (Full title of the plan) Theodore R. Moore Executive Vice President, General Counsel and Secretary 2001 Kirby Drive, Suite 200 Houston, Texas 77019 (Name and address of agent for service) (281) 730-5100 (Telephone number, including area code, of agent for service) Copies to: Lanchi D. Huynh Kirkland & Ellis LLP 4550 Travis Street Dallas, Texas 75205 (214) 972-1770 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☐ |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer   |     | ☒ |     | Smaller reporting company |     | ☒ |
|                         |     |   |     | 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 7(a)(2)(B) of the Securities Act. ☐

EXPLANATORY NOTE Nine Energy Service, Inc. (the “Registrant”) is hereby registering 3,900,000 additional shares of its common stock, par value $0