Early movers: VIAB, BOBE, HRB, PANW, AZN, ESRX, AMZN, VLKAY, DG & more By: CNBC.com News August 31, 2016 at 07:54 AM EDT These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: Amazon.com Astrazeneca Plc ADR Dollar General Express Scripts Holding H&R Block Mattel PNC Financial Services Palo Alto Networks Inc Quest Diagnostics Via Renewables Inc Cl A Viacom