COP — ConocoPhillips

Exxon Mobil is the largest publicly traded oil and gas company in the world. The company operates across the entire energy value chain — upstream exploration and production, downstream refining and marketing, and chemical manufacturing. ExxonMobil also has growing low-carbon investments.

Chevron is one of the largest integrated oil and gas companies in the world, with upstream exploration and production operations in the Permian Basin, Gulf of Mexico, Australia (LNG), Kazakhstan, and other regions. Its downstream refining operations produce gasoline, jet fuel, and petrochemicals, while chemicals and lubricants generate additional revenue. Chevron is one of the most financially disciplined major oil companies, known for variable dividend commitments and share buybacks tied to cash flow. Chevron attempted to acquire Hess Corporation in 2023, which faced arbitration complications related to Guyana.

EOG Resources is one of the largest and most technically sophisticated independent oil and gas companies in the United States, with premier acreage in the Permian Basin, Eagle Ford, Bakken, and Delaware Basin. EOG's culture emphasizes decentralized decision-making, technology-driven well performance, and strict capital discipline. The company consistently achieves best-in-class drilling efficiency and well productivity metrics, generating strong returns on capital even at moderate oil prices.

Pioneer Natural Resources was one of the largest Permian Basin pure-play oil and gas producers, with premier acreage in the Midland Basin and Delaware Basin in West Texas. Founded by legendary oilman Scott Sheffield, Pioneer became the defining Permian Basin compounder over the 2010s through disciplined horizontal well development, variable return dividends, and operational excellence. ExxonMobil acquired Pioneer in a $59.5 billion all-stock deal that closed in May 2024 in what was the largest oil industry acquisition in decades. Pioneer shares are no longer publicly traded following the acquisition.