Gastar Exploration Inc. was an independent energy company engaged in the exploration, development, and production of oil, condensate, natural gas, and natural gas liquids (NGLs) in the United States. The company’s principal business activities included the identification, acquisition, and subsequent exploration and development of oil and natural gas properties, with a focus on unconventional reserves such as shale resource plays. Gastar held a concentrated acreage position in the core of the STACK Play in Oklahoma, an area known for multiple oil and natural gas-rich reservoirs, including the Meramec and Osage formations within the Mississippi Lime, the Oswego limestone, the Woodford shale, and Hunton limestone formations.