WalGreens (ticker symbol WAG) is the nation's largest drugstore chain with fiscal 2011 sales of $72 billion. The company operates 7,779 drugstores in all 50 states, the District of Columbia and Puerto Rico.

2011 rank: 17

2010 rank: 13

Full-time employees in 2011: 3,464

Part-time employees in 2011: 1,085

Total employees in 2011: 4,559

Total employees in 2010: 6,272