CANADA STOCKS-TSX plunges 4 percent, S&P downgrade stokes fears By: Reuters: Company News August 08, 2011 at 17:44 PM EDT * TSX tumbles 491.21 points, or 4.04 percent, to 11,670.96 Read More >> Related Stocks: Barrick Gold Corporation Canadian Natural Resources Limited Genpact Ltd Goldcorp Manulife Financial Corporation Royal Bank of Canada S&P/TSX Composite Sempra Energy Standard & Poors 500 Suncor Energy Inc Teck Cominco Limited