After-hours buzz: Twitter, Ebay, Costco & more By: CNBC.com News April 29, 2014 at 16:35 PM EDT Check out which companies are making headlines after the bell Tuesday: Twitter, Ebay, Costco Read More >> Related Stocks: AFLAC Alstom S.A. Cimpress N.V. Ord Costco Wholesale Express Scripts Holding General Electric Lam Research Marriott International Michael Kors Holdings Seagate Technology Plc Twitter, Inc. Wells Fargo eBay