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Repsol SA (ticker symbol: REP) is a global multi-energy company primarily engaged in the upstream and downstream of oil and gas. Founded in 1986 and headquartered in Madrid, Spain, the company operates in all areas of the oil and gas industry, including exploration, production, refining, transport, and distribution of energy. Repsol is also active in the power and natural gas markets with a growing focus on renewables and new energy solutions.

Shell is an integrated oil and gas company that explores for, produces, and refines oil around the world. In 2025, it produced 1.5 million barrels of liquids and 7.3 billion cubic feet of natural gas per day. At end-2025, reserves stood at 8.1 billion barrels of oil equivalent, 44% of which consisted of liquids. Its production and reserves are in Europe, Asia, Oceania, Africa, and North and South America. The company operates refineries with a capacity of 1.4 mmb/d located in the Americas, Asia, and Europe, and sells about 9 million tons per year of chemicals. Its largest chemical plants, often integrated with its local refineries, are in NorthWestern Europe, China, and North America.