6. Biogen Idec

Headquarters: Cambridge Sector: Biotechnology Symbol / Exchange: BIIB / Nasdaq Employees: 4,300 RANK 19/100 Chief executive: James C. Mullen Market value: $18.37 billion RANK 5/100 2007 revenue: $3.17 billion RANK 11/100 2007 net income: $637.2 million RANK 8/100 On the net: biogenidec.com

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