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18. SemGroup
SemGroup
2007 revenue: $14.2 billion
Fiscal year end: Dec. 31
2007 Employees: 2,272
Industry: Pipelines
CEO: Thoams L. Kivisto
Location: Tulsa, Okla.

SemGroup trucks and pumps oil from refineries to end users. It lost a bidding war with Morgan Stanley to buy rival TransMontaigne.

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Last updated May 28 2008: 12:40 PM ET