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8. HCA
2007 revenue: $26.9 billion
Fiscal year end: Dec. 31
2007 Employees: 161,000
Industry: Health care: Medical facilities
CEO: Jack O. Bovender Jr.
Location: Nashville, Tenn.

Otherwise known as Hospital Corporation of America, HCA is one of the biggest for-profit hospital operators in the United States with 169 hospitals and 115 outpatient centers in 20 states and England. Bain Capital, Kohlberg Kravis Roberts, Merrill Lynch Global Private Equity, HCA founder Dr. Thomas F. Frist, Jr. and HCA management took the company private in 2006.

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Last updated May 28 2008: 12:40 PM ET