Fortune 500 rank: 44 (Previous rank: 45)
2006 Revenues (millions): $47,409
Headquarters: Deerfield, IL
Get quote: WAG
The nation's largest pharmacy chain celebrated 32 consecutive years of record sales and earnings with 12% growth in each for 2006. Roughly two-thirds of its total revenues are from the sale of prescription drugs - a business which continues to grow steadily at 19% per quarter. But some worry lies ahead as competitor Wal-Mart unveiled a new drug sales plan that offers some generic prescriptions for just $4.
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