Tesoro invests $400 million to expand petrochemical production By: San Antonio Business Journal via Business Journals July 21, 2014 at 17:31 PM EDT San Antonio-based refiner Tesoro Corp. will spend $400 million to produce petrochemical feedstocks in its U... Read More >> Related Stocks: Exxon Mobil Tesoro Petroleum Co iPath Dow Jones-Goldman Sachs Crude Oil Fund