SM Energy Company, an independent energy company, together with its subsidiaries, engages in the acquisition, exploration, exploitation, development, and production of crude oil, natural gas, and natural gas liquids in North America. It has operations in the South Texas and Gulf Coast region primarily on Eagle Ford shale program; and the Rocky Mountain region, including the Bakken/Three Forks formations in the North Dakota portion of the Williston Basin. The company also operates in the Mid-Continent region consisting of the Granite Wash formation in western Oklahoma, and the Haynesville and Woodford shale assets; and the Permian region covering western Texas and eastern New Mexico focusing on Mississippian limestone play. The company was formerly known as St. Mary Land & Exploration Company and changed its name to SM Energy Company in May 2010. SM Energy Company was founded in 1908 and is headquartered in Denver, Colorado.