Friday Sector Laggards: Materials, Healthcare By: Market News Video June 27, 2014 at 14:37 PM EDT The worst performing sector as of midday Friday is the Materials sector, showing a 0.4% loss. Within that group, DuPont (DD) and Dow Chemical Co.. Read More >> Related Stocks: Alexion Pharmaceuticals Dow Chemical DuPont USA MATERIALS Regeneron Pharmaceuticals