Fortune 500 rank: 35 (Previous rank: 38)
2006 Revenues (millions): $56,953
Headquarters: Indianapolis, IN
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The country's largest health insurer, which claims more than 31 million members, saw both sales and profits grow 26%, thanks to new enrollments in its Blue Cross and Blue Shield and Medicare plans. Also contributing to growth was its 2005 acquisition of WellChoice, which added 5 million new accounts.
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