S&P 500 plunges from major resistance By: MarketWatch January 27, 2015 at 12:00 PM EST The S&P 500 Index has failed its latest technical test, plunging from major resistance. Read More >> Related Stocks: China Largecap Ishares ETF FINANCIAL SEL Mid Cap SPDR 400 Trust, Series 1 Russell 2000 Ishares ETF SPDR GOLD TECHNOLOGY Transportation Average Ishares ETF