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6. GMAC
2007 revenue: $31.5 billion
Fiscal year end: Dec. 31
2007 Employees: 26,700
Industry: Diversified financials
CEO: Alvaro G. de Molina
Location: Detroit, Mich.

GMAC was once the auto-financing arm of General Motors, but it is now a diversified financial firm that also provides real estate financing and insurance. A group led by private investment firm Cerberus Capital Management, L.P. bought a majority stake from GM in 2006, but GMAC still shares the same headquarters as its former parent company.

NEXT: Bechtel

Last updated May 28 2008: 12:40 PM ET