X0202 SCHEDULE 13G 0000061227 XXXXXXXX LIVE Common Stock 03/05/2026 0001532286 Nine Energy Service, Inc. 65441V200 2001 KIRBY DRIVE SUITE 200 HOUSTON TX 77019 Rule 13d-1(b) MacKay Shields LLC b DE 0.00 1662134.00 0.00 1662134.00 1662134.00 N 11.91 IA The reporting persons are party to a voting agreement with the Issuer dated March 5, 2026. This agreement allows the reporting persons to vote up to 10% of the total voting power of all of the outstanding voting securities of the Company on such matter as of the applicable record date after giving effect to any other voting agreement between the Company and any of its shareholders. The percentage reported herein is calculated based on 13,950,000 shares of Common Stock outstanding as of March 5, 2026. NYLI MacKay High Yield Corporate Bond Fund b MA 0.00 1404300.00 0.00 1404300.00 1404300.00 N 10.07 IV The reporting persons are party to a voting agreement with the Issuer dated March 5, 2026. This agreement allows the reporting persons to vote up to 10% of the total voting power of all of the outstanding voting securities of the Company on such matter as of the applicable record date after giving effect to any other voting agreement between the Company and any of its shareholders. The percentage reported herein is calculated based on 13,950,000 shares of Common Stock outstanding as of March 5, 2026. Nine Energy Service, Inc. 2001 KIRBY DRIVE, SUITE 200, HOUSTON, 77019 MacKay Shields LLC NYLI MacKay High Yield Corporate Bond Fund 299 PARK AVENUE 32ND FLOOR New York, New York 10171 MacKay Shields LLC - Delaware NYLI MacKay High Yield Corporate Bond Fund - Massachusetts N IA MacKay Shields LLC - 1,662,134 NYLI MacKay High Yield Corporate Bond Fund - 1,404,300 21.98 MacKay Shields LLC - 0 NYLI MacKay High Yield Corporate Bond Fund - 0 MacKay Shields LLC - 1,662,134 NYLI MacKay High Yield Corporate Bond Fund - 1,404,300 MacKay Shields LLC - 0 NYLI MacKay High Yield Corporate Bond Fund - 0 MacKay Shields LLC - 1,662,134 NYLI MacKay High Yield Corporate Bond Fund - 1,404,300 Y N MacKay Shields LLC, an investment advisor registered under Section 203 of the Investment Advisors Act of 1940 is deemed to be the beneficial owner of 1,662,134 shares of the 11.91% of the Common Stock believed to be outstanding as a result of acting as investment adviser to various clients. All calculations of percentage ownership are based on a total of 13,950,000 shares of Common Stock issued and outstanding as of March 5, 2026. The NYLI MacKay High Yield Corporate Bond Fund, a registered investment company for which MacKay Shields acts as a sub investment adviser, may be deemed to beneficially own 10.07% of the outstanding common stock of the Company. New York Life Investment Management LLC and indirect wholly owned subsidiary of New York Life and an affiliate of MacKay Shields LLC, is the manager of the NYLI MacKay High Yield Corporate Bond Fund. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Joint Filing Agreement Each of the undersigned hereby agrees that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and that all subsequent amendments to this statement on Schedule 13G with respect to the common stock of Nine Energy Services, Inc., may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned further agree that each party hereto is responsible for the timely filing of such statement on Schedule13G and any amendments thereto, and for the accuracy and completeness of the information concerning such party contained therein; provided, however, that no party is responsible for the accuracy or completeness of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate. This Joint Filing Agreement may be signed in counterparts with the same effect as if the signature on each counterpart were upon the same instrument. IN WITNESS WHEREOF, the undersigned have executed this Agreement as of March 24, 2026. New York Life Investments Funds, on behalf of its series, NYLI MacKay High Yield Corporate Bond Fund By: /s/ Kirk C. Lehneis Name: Kirk C. Lehneis Title: President By: /s/ Rene A. Bustamante Name: Rene A. Bustamante Title: Chief Administrative Officer MacKay Shields LLC MacKay Shields LLC Chris Fitzgerald 03/31/2026 NYLI MacKay High Yield Corporate Bond Fund Chris Fitzgerald 03/31/2026