40. PerkinElmer

Headquarters: Wellesley Sector: Medical devices Symbol / Exchange: PKI / New York Employees: 8,700 RANK 12/100 Chief executive: Robert F. Friel Market value: $2.85 billion RANK 20/100 2007 revenue: $1.79 billion RANK 18/100 2007 net income: $133.8 million RANK 24/100 On the net: perkinelmer.com

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