After-hours buzz: Yum, CSX, Celgene & more By: CNBC.com News July 14, 2015 at 17:36 PM EDT Check out the companies making headlines after the bell Tuesday: Yum, CSX, Celgene & more. Read More >> Related Stocks: Allegheny Technologies CSX Corp Celgene Corp Cummins Ultragenyx Pharmaceu Yum Brands