ConocoPhillips is one of the largest foreign operators on the Norwegian continental shelf. Headquartered in Tananger outside Stavanger, the company has a total of approximately 1900 employees. The company's core activities in Norway are petroleum exploration and production. ConocoPhillips holds a strong position in big fields on the Norwegian continental shelf. The company is the operator of the fields in the Greater Ekofisk Area, which is the mainstay of the company’s activities in Norway. The company also has assets in fields operated by co-venturers, including Heidrun, Visund, Oseberg, Troll, Grane, Alvheim and Huldra. ConocoPhillips Worldwide - ConocoPhillips is the world's largest independent exploration and production (E&P) company, based on proved reserves and production of liquids and natural gas. Headquartered in Houston, Texas, ConocoPhillips has operations in 30 countries and approx. 17,000 employees as of May 2013.