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5. Kaiser Permanente
2007 revenue: $37.8 billion
Fiscal year end: Dec. 31
2007 Employees: 159,700
Industry: Health care: Medical facilities
CEO: George C. Halvorson
Location: Oakland, Calif.

Kaiser Permanente is the nation's biggest not-for-profit health plan, serving 8.7 million members through 13,000 doctors and 32 medical centers across the nation.

NEXT: GMAC

Last updated May 28 2008: 12:40 PM ET