After-hours buzz: Amazon, Microsoft, Zynga & more By: CNBC.com News October 24, 2013 at 16:30 PM EDT Check out which companies are making headlines after the bell Thursday: Read More >> Related Stocks: Amazon.com Cerner Corp DuPont USA Eastman Chemical Express Scripts Holding KLA-Tencor Corp Maxim Integrated Microsoft Netgear Inc Principal Financial Group Wynn Resorts Zynga Inc Cl A