SemGroup transports oil, natural gas and other products across North America through a network of pipelines, processing plants, refinery-connected storage facilities and deep-water marine terminals. The company began trading on the New York Stock Exchange under the symbol 'SEMG' in 2010. The company was originally founded in 2000 and as of 2007 was the 18th largest private company in the US, but filed for bankruptcy in 2008. As of December 2009, the company had restructured and emerged from bankruptcy at a reduced size. The company's headquarters are in Tulsa, Oklahoma.