(CNBC) — U.S. stocks closed lower Monday as investors looked ahead to earnings season.
"In this sort of environment where the news is mixed and the valuations are pretty full, it's an ample time for uncertainties to come to the fore," said Bruce McCain, chief investment strategist at Key Private Bank.
The major indexes turned lower as the close neared. The Dow Jones industrial average was about 8 points lower after earlier adding more than 150 points.
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