M&A flurry lifts S&P, Nasdaq; Nike drags Dow

The S&P 500 and the Nasdaq were slightly higher on Monday as a raft of deals lifted sentiment, even as investors remained cautious ahead of the outcome of the U.S. election next week. The Dow Jones Industrial average was little changed, weighed down by a 3 percent fall in Nike following a BofA Merrill Lynch downgrade. While Clinton had opened a recent lead over her unpredictable Republican rival Donald Trump in national polls, it had been narrowing even before the email controversy resurface