The Dow Jones industrial average fell 2.19 points, or 0.01 percent to close at 20,979.75, with UnitedHealth leading decliners and Microsoft outperforming.
The S&P 500 dipped 1.65 points, or 0.07 percent, to end at 2,400.67, with utilities leading nine sectors lower and financials and information technology as the only advancers.
The Nasdaq advanced 20.20 points, or 0.33 percent, to close at 6,169.87.
About four stocks declined for every three advancers at the New York Stock Exchange, with an exchange volume of 792.30 million and a composite volume of 3.406 billion at the close.
On tap this week:
Earnings: Urban Outfitters, Jack in the Box, Vodafone, Staples, Manchester United
7:00 a.m. Mortgage applications
8:30 a.m. Initial claims
8:30 a.m. Philadelphia Fed survey
1:00 p.m. Cleveland Fed President Loretta Mester
9:15 a.m. St. Louis Fed President James Bullard