Houston-headquartered ConocoPhillips is an independent exploration and production company that explores for, produces, transports and markets oil and natural gas worldwide. Its operations and activities span 15 countries, with a notable Alaska presence built over more than 50 years; the company is Alaska’s largest oil producer and operates major production hubs on the North Slope. ConocoPhillips places safety and environmental stewardship at the center of its global work.
ExxonMobilFor more than 140 years, ExxonMobil has grown from a regional U.S. kerosene marketer into a publicly traded petroleum and petrochemical company with operations in more than 56 countries. Its approximately 61,000 employees serve customers through the Exxon, Esso and Mobil brands while supporting energy and product needs across transportation, industry and everyday life.HONESDALE, PA
Cenovus EnergyCenovus Energy is a Calgary-headquartered Canadian integrated energy company that develops oil and natural gas assets, upgrades and refines crude, and markets fuels and other energy products across North America. Operating in Canada, the United States and the Asia Pacific region, it also runs ethanol plants in Western Canada that turn grain into ethanol and a high-protein livestock-feed co-product. Cenovus began independent operations in 2009 and expanded its integrated operations through the 2021 acquisition of Husky Energy, whose roots reach back to a 1938 refinery operation.OREGON, OH
Obsidian Energy LtdCalgary-based Obsidian Energy Ltd. explores, develops and produces oil and natural gas from a focused portfolio of Alberta assets. Its distinctive operating mix pairs a large, contiguous Peace River heavy-oil land base with light-oil properties in Willesden Green and Viking, and the company reported average production of 28,200 boe/d in the second quarter of 2026. Obsidian also operates owned infrastructure across its core areas, supporting continued drilling and development.EDINBORO, PA
CITGO Petroleum CorporationFounded in 1910 as Cities Service, CITGO Petroleum Corporation is a Houston-based independent refiner that manufactures and distributes fuels, lubricants and petrochemical products. Its three U.S. refineries have a combined capacity of 829,000 barrels per day, supported by 43 terminals and eight pipelines. CITGO also stands out for its long-running community work, including more than $290 million raised for the Muscular Dystrophy Association since 1986.MEDWAY, OH