Wall Street's main indexes were down on Monday as investors await inflation data this week and chip companies seesawed after agreeing to share a portion of revenue from China sales with the U.S. under a trade policy shift from the Trump administration.

The S&P 500 fell 0.2 points, or flat at the open to 6389.67​, while the Nasdaq Composite rose 9.6 points, or 0.04%, to 21,459.654 at the opening bell.