ExxonMobil

Pioneer Natural Resources is an independent oil and gas exploration and production company, established in 1997 through the merger of Parker & Parsley Petroleum Company and MESA Inc. The company is primarily engaged in the exploration and production of oil, natural gas liquids, and gas reserves. Historically rooted in Texas, Pioneer is a prominent player in the Spraberry/Wolfcamp oil field within the Permian Basin and the Eagle Ford Shale in South Texas. Additionally, it ranks among the largest natural gas operators in southeastern Colorado's Raton Basin and in gas fields around Hugoton, Kansas, as well as in the western Texas Panhandle. Pioneer also conducts drilling operations in the liquids-rich Barnett Shale and in Alaska’s Oooguruk oil field, where it became the first independent operator to produce oil on the North Slope in 2008. The company announced a significant joint venture in June 2010, partnering with Reliance Industries to develop the Eagle Ford Shale.

InterOil Corporation is an independent oil and gas company with a sole focus on Papua New Guinea (PNG). It operates one of Asia's largest undeveloped gas fields, Elk-Antelope, located in PNG's Gulf Province. InterOil holds exploration licenses covering approximately 16,000 square kilometers in the region. The company is headquartered in Singapore and Port Moresby, PNG, with operations centered around developing its gas assets for production.

Celtic Exploration Ltd. engages in the exploration, development, and production of oil and natural gas.

XTO Energy Inc., founded in 1986 and headquartered in Fort Worth, Texas, specializes in the extraction of natural gas and crude oil from U.S. shale and tight formations. The company is the largest holder of natural gas reserves in the nation and has achieved one of the highest drilling success rates in the industry. Operating across diverse regions in the United States, including Montana, Pennsylvania, Utah, Louisiana, Texas, and Ohio, XTO Energy owns interests in approximately 40,000 producing oil and natural gas wells. The company focuses on the acquisition, development, and exploration of oil and gas properties, prioritizing safe and reliable energy production while positively impacting the communities in which it operates.