The  posted a four-day losing streak on Wednesday — its longest slide since early May — as investors braced for a key meeting between President Donald Trump and Chinese President Xi Jinping later this week. 

The broad index closed 0.1% lower at 2,913.78, giving up gains from earlier the day. The Dow Jones Industrial Average fell 11.40 points to 26,536.82 after rising more than 100 points to start off the session.