Toronto index retreats in tandem with U.S. markets By: MarketWatch April 16, 2010 at 12:43 PM EDT After two days of gains, Canadian stocks head south in tandem with U.S. markets as news of Goldman Sachs eroded investors' confidence. Read More >> Related Stocks: Bank of Nova Scotia Canadian Natural Resources Limited Goldman Sachs Group Suncor Energy Inc Teck Cominco Limited