Ownership Filing for Nine Energy Service, Inc. by MacKay Shields LLC

MacKay Shields LLC, an investment advisor, has reported beneficial ownership of 1,662,134 shares of Nine Energy Service, Inc. Common Stock, representing 11.91% of the outstanding shares as of March 5, 2026. This ownership is a result of acting as an investment adviser to various clients. The NYLI MacKay High Yield Corporate Bond Fund, for which MacKay Shields acts as a sub-investment adviser, may be deemed to beneficially own 10.07% of the outstanding common stock. Both entities are party to a voting agreement with the Issuer, allowing them to vote up to 10% of the total voting power. All calculations are based on 13,950,000 shares of Common Stock outstanding on March 5, 2026. The filing certifies that the securities were acquired and are held in the ordinary course of business and not for the purpose of influencing control.