After-hours buzz: Potbelly, Zumiez, Zynga & more By: CNBC.com News July 09, 2014 at 17:09 PM EDT Check out which companies are making headlines after the bell Wednesday: WD-40, Zynga, Zumiez & more. Read More >> Related Stocks: Helen of Troy Ltd LL Flooring Hldgs Inc Potbelly Corp Tractor Supply W D 40 Company Zumiez Inc Zynga Inc Cl A