Historical stock prices for Nexen (NXY). Nexen Inc. (Nexen) is an independent global energy company. The Company's conventional oil and gas assets consist of large acreage positions in select basins, including the United Kingdom North Sea, deep-water Gulf of Mexico and offshore West Africa. Nexen operates the Buzzard field and platform in the United Kingdom. In the Gulf of Mexico, the Company holds deep-water and shelf producing assets, as well as several undeveloped deep-water discoveries, including Appomattox, Vicksburg and Knotty Head. The deep-water Gulf of Mexico is near infrastructure and continental United States markets. Nexen's oil sands investments include interests in the Long Lake project, the Syncrude joint venture and 656,000 undeveloped acres (gross) in the Athabasca oil sands in northern Alberta. During the year ended December 31, 2011, the Company acquired a non-operated interest in Poland and by beginning to test shale gas opportunities in Colombia.