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22. Aramark
2007 revenue: $12.4 billion
Fiscal year end: Sept. 30
2007 Employees: 207,500
Industry: Diversified outsourcing services
CEO: Joseph Neubauer
Location: Philadelphia, Pa.

Aramark provides food services, facilities management and uniforms worldwide to health care institutions, schools, stadiums and other businesses.

NEXT: Highmark

Last updated May 28 2008: 12:40 PM ET