Stocks making the biggest moves premarket: TWTR, REGN, YUM, GRUB, CVS, TMUS & more By: CNBC.com News February 08, 2018 at 08:07 AM EST These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: CVS Health Corp Grubhub Ord Shs Regeneron Pharmaceuticals Twitter, Inc. Yum Brands