BRIEF-Exxon, Chevron, Hess said to be in joint bid for Mexican oil- Bloomberg, citing sources By: Reuters: Company News August 18, 2016 at 20:15 PM EDT * Exxon, Chevron, Hess said to be in joint bid for Mexican oil- Bloomberg, citing sources Read More >> Related Stocks: Chevron Corp Exxon Mobil Hess Corp