The Case Of PetroChina, The Worst Stock Slump Ever By: Benzinga via Benzinga November 01, 2017 at 09:48 AM EDT The unofficial title of the world's worst stock slump is awarded to PetroChina Company Limited (ADR) (NYSE: PTR), Bloomberg reported. ... Read More >> Related Stocks: Chevron Corp Exxon Mobil Microsoft PetroChina iPath Dow Jones-Goldman Sachs Crude Oil Fund