SemGroup

SemGroup headquartered in Tulsa, Oklahoma, is a transporter of oil and natural gas through pipelines from refineries to end users, as well as the manufacturer and seller of asphalt. The company 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.

SemGroup

SemGroup headquartered in Tulsa, Oklahoma, is a transporter of oil and natural gas through pipelines from refineries to end users, as well as the manufacturer and seller of asphalt. The company 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.