Schedule 13G Filing for Nine Energy Service, Inc.

MacKay Shields LLC and NYLI MacKay High Yield Corporate Bond Fund have filed a Schedule 13G, reporting beneficial ownership of Nine Energy Service, Inc. common stock. MacKay Shields LLC, acting as an investment advisor, beneficially owns 1,662,134 shares, representing 11.91% of the outstanding common stock. This ownership is a result of its role as investment advisor 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 1,404,300 shares, constituting 10.07% of the outstanding common stock. New York Life Investment Management LLC, an affiliate of MacKay Shields LLC, manages the NYLI MacKay High Yield Corporate Bond Fund. All calculations are based on 13,950,000 shares of common stock outstanding as of March 5, 2026. The filing also notes a voting agreement between the reporting persons and the Issuer dated March 5, 2026, which allows the reporting persons to vote up to 10% of the total voting power of the company's outstanding voting securities.