The "WAG" stock symbol represents Walgreen Company (Walgreens), the largest retail drugstore chain in the United States. Walgreen Company stock, which first went public in 1927, has a dual market listing, trading on both the New York Stock Exchange and Nasdaq.
Since 1901 -- when Charles R. Walgreen, Sr. opened the first Walgreens Drugstore in Chicago -- the company has grown to include more than 8,600 locations across the United States and its territories. The company also operates medical service facilities, mail order pharmacies, specialty pharmacies, in-store health care clinics and work site health and wellness facilities. Walgreen Company's corporate headquarters is located at 108 Wilmot Road in Deerfield, IL.