Midday movers: Barclays, Pfizer, Twitter & More By: CNBC.com News May 06, 2014 at 12:34 PM EDT Take a look at some of Tuesday's midday movers: Read More >> Related Stocks: Astrazeneca Plc ADR Barclays Plc ADR Delta Air Lines Discovery Comm B Discovery Communications NVIDIA Corp Pfizer Twitter, Inc. Wellcare Group