48. NStar

Headquarters: Boston Sector: Services Symbol / Exchange: NST / New York Employees: 3,150 RANK 25/100 Chief executive: Thomas J. May Market value: $3.25 billion RANK 18/100 2007 revenue: $3.26 billion RANK 10/100 2007 net income: $221.5 million RANK 13/100 On the net: nstaronline.com

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