S&P 500 rattling the cage on a breakout By: MarketWatch April 26, 2011 at 11:59 AM EDT The Standard & Poor’s 500 Index is challenging major resistance leading in to the Federal Reserve’s policy directive, due out Wednesday afternoon. Read More >> Related Stocks: Altera Corp Ingersoll-Rand Plc Paymentus Holdings Inc Cl A Plexus Corp Silver Trust Ishares