41. American Tower Corp.

Headquarters: Boston Sector: Telecommunications Symbol / Exchange: AMT / New York Employees: 1,124 RANK 50/100 Chief executive: James D. Taiclet Jr. Market value: $15.52 billion RANK 6/100 2007 revenue: $1.46 billion RANK 23/100 2007 net income: $92.7 million RANK 30/100 On the net: americantower.com

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