After-hours buzz: Citigroup, Viacom, Dollar Tree & more By: CNBC.com News June 23, 2016 at 17:55 PM EDT Check out the companies making headlines after the bell Thursday: Citigroup, Viacom, Dollar Tree and more. Read More >> Related Stocks: Citigroup Dollar Tree Huntington Bancshares Via Renewables Inc Cl A Viacom Xerox Corp