SemGroup Corp. engages in the transportation, storage, distribution, market and other midstream services. It offers services for end-users and consumers of crude oil, natural gas, natural gas liquids and refined products. It operates through the following segments: U.S. Liquids, U.S. Gas, Canada, and Corporate and Other. The U.S. Liquids segment consists of crude oil pipelines, truck transportation, storage, terminals, and marketing businesses in the United States. The U.S. Gas segment offers natural gas gathering, processing, and marketing services. The Canada segment owns and operates natural gas processing and gathering facilities in Alberta, Canada. The Corporate and Other segment represents the results of operations for its former United Kingdom, and Mexican businesses. The company was founded in February 2000 and is headquartered in Tulsa, OK.