Midday movers: AT&T, Caterpillar, Facebook & More By: CNBC.com News July 24, 2014 at 12:25 PM EDT Take a look at some of Thursday's midday movers: Read More >> Related Stocks: AT&T Inc Atlantic Power Corp Caterpillar D.R.Horton Facebook Precision Castparts Qualcomm, Inc. Sodastream Int Ltd Tractor Supply TripAdvisor Under Armour