PetroChina Shares Indicated Higher Amid BofA's Upgrade To Buy By: Benzinga via Benzinga April 18, 2016 at 09:18 AM EDT PetroChina Company Limited (ADR) (NYSE: PTR) shares are down 4 percent since March 18. BofA Merrill Lynch’s Sonia Song upgraded ... Read More >> Related Stocks: PetroChina