U.S. stock trading is on pause today, but U.S. stock-index futures continue to change hands and were mostly lower. Futures for the Dow Jones Industrial Average slipped 200 points, or 0.6%, after the index ended last Friday 321 points higher at 31,097. S&P 500 futures were 0.7% lower, with futures for the tech-stock-heavy Nasdaq also 0.7% in the red.