Gulfport Energy Corp.has hired Donnie Moore asCOO. Moore, unrelated to CEO Michael G. Moore, is formerly a Noble Energy Inc. executive. He was vice president of Noble’s Texas operations in the Eagle Ford Shale and the Permian Basin’s Delaware sub-basin.

Rex Energy Corp.has appointed Chief Accounting Officer Curt Walker as CFO. He would continue to serve as accounting officer. Former CFO Thomas Rajan resigned for unspecified reasons not related to any disagreements with management, or financial or legal matters, the company said.