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CHICAGO — Chicago-based ShopperTrak is moving its corporate headquarters to Willis Tower with a new lease of 52,450 square feet. ShopperTrak anonymously counts people, analyzes data and identifies opportunities to increase revenue for retailers, mall developers and entertainment venues. Derek Rolison and Miek Kazmierczak of U.S. Equities Asset Management represented Willis Tower in the transaction. Bill Sheehy and Dan McCarthy of Jones Lang LaSalle represented the tenant. Willis Tower has completed more than one million square feet of leasing activity in 2012, including the addition of United Airlines' corporate headquarters.