Defunct oil companies

Wintershall Holding GmbH, based in Kassel, was Germany's largest crude oil and natural gas producer. It was a wholly owned subsidiary of BASF. The company was active in oil and gas exploration and production with operations in Europe, North Africa, South America as well as the Middle East region. The withdrawal from Russia, a key production area for the company, was announced in 2023. Wintershall employed more than 2,000 people worldwide. In the 2018 financial year the company produced around 171 million barrels of oil equivalent (boe) of oil and gas. Revenues amounted to 4.09 billion euros.

Compañía Arrendataria del Monopolio del Petróleo, S.A. (Campsa) was the state-owned petroleum products company of Spain. Created in the 1920s during General Primo de Rivera's dictatorship, it was dissolved in 1992 owing to the demands of the European Union. Its assets were distributed to the largest private petroleum companies in the Spanish market at the time, which were mainly Repsol, Cepsa and BP. The rights to the Campsa brand were given to Repsol. thumb|Campsa service station in Valladolid

Norwegian energy retail company, formed by the 2010 separation of the downstream business of Statoil ASA into a separate listed company

subcompany of the Royal-Dutch-Shell-oil company

Norwegian upstream petroleum company acquired by Norsk Hydro in 1999.