CastleKnight Master Fund LP Reports New 8.3% Stake in Nine Energy Service, Inc.

On April 9, 2026, CastleKnight Master Fund LP and associated entities, including Aaron Weitman, filed a Schedule 13G disclosing a new significant stake in Nine Energy Service, Inc. (NINE). The reporting group collectively beneficially owns 1,157,943 shares of common stock, representing an 8.3% ownership stake in the company. The filing indicates that the event triggering this disclosure occurred on March 31, 2026. The reporting group consists of CastleKnight Master Fund LP, CastleKnight Fund GP LLC, CastleKnight Management LP, CastleKnight Management GP LLC, Weitman Capital LLC, and Aaron Weitman. Each entity disclaims beneficial ownership of the reported securities except to the extent of their pecuniary interest. The securities were acquired in the ordinary course of business and not for the purpose of changing or influencing the control of the issuer. Aaron Weitman serves as the manager for the corporate entities involved and is identified as a control person for CastleKnight Management LP. This represents a substantial new position for the investment group in the energy services sector.