7. Thermo Fisher Scientific

Headquarters: Waltham Sector: Medical devices Symbol / Exchange: TMO / New York Employees: 33,000 RANK 5/100 Chief executive: Marijn E. Dekkers Market value: $23.79 billion RANK 4/100 2007 revenue: $9.75 billion RANK 5/100 2007 net income: $779.6 million RANK 6/100 On the net: thermofisher.com

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