Continental Resources, Inc. engages in the exploration and production of crude oil and natural gas primarily in the north, south, and east regions of the United States. The company primarily sells its oil and natural gas production to end users, as well as to midstream marketing companies or oil refining companies at the lease. As of December 31, 2010, its estimated proved reserves were 364.7 million barrels of oil equivalent, with estimated proved developed reserves of 140.4 million barrels of oil equivalent. The company had interests in 2,726 wells and served as the operator of 1,888 of these wells. Continental Resources, Inc. was founded in 1967 and is based in Enid, Oklahoma.