Technology firms remained lower on concerns that trade tensions with China are rising again. The S&P 500 Index retraced an earlier slide to trade little changed, while the Nasdaq 100 Index tumbled to the lowest since Aug. 1 on its third day of declines, with software companies and semiconductor manufacturers the worst performing groups in the market. Volatility appears to be returning, with the Cboe Volatility Index, or VIX, at one point touching its highest intraday level since June.
