SandRidge Energy Inc. SandRidge Energy, Inc. is an independent oil and natural gas company, which is engaged in the exploration, development and production activities of oil and gas. The company also operates businesses that are complementary to its primary development and production activities, SandRidge Energy, Inc. (NYSE: SD) is an oil and natural gas exploration and production company headquartered in Oklahoma City, Oklahoma with its principal focus on developing high-return, growth oriented projects in Oklahoma and Colorado. SandRidge operates primarily in Oklahoma’s Stack play and in Colorado. Shale drillers outside the Permian Basin, the most prolific U.S. oil play, have struggled amid lower prices for crude and gas.