StockNews.com downgraded shares of Gran Tierra Energy (NYSEAMERICAN:GTE – Get Rating) from a buy rating to a hold rating in a research note released on Thursday morning. Gran Tierra Energy Trading Up 3.1 % Shares of NYSEAMERICAN:GTE opened at $6.23 on Thursday. Gran Tierra Energy has a 12-month low of $6.00 and a 12-month high […]