The S&P 500 was down 0.1% to 3,022.33 during midday trading.
The Dow Jones Industrial Average rose 0.1% to 27,233.25.
The Nasdaq fell 0.6% to 8,281.33.
The yield on a 10-year Treasury bond dropped 1.3% to 2.05%.
The price of gold increased 0.1% to $1,421.
The price of oil climbed 0.8% to $56.67 a barrel.
Chipotle Mexican Group (NYSE: CMG) rose 3% to $802.98 and a $22.3 billion market cap. The Newport Beach-based company hit a new all-time high of $811.95 earlier Monday after Goldman Sachs initiated coverage of the restaurant group with a buy rating and a $1,000 price target. Goldman also added Chipotle to a "conviction buy" list.
Irvine-based Alteryx (NYSE: AYX) dipped 3.3% to $117.45 and a $7.3 billion market cap. Shares are still up nearly 200% in the past year. The data science software maker is expected to report revenue gains of about 60% when it posts second quarter earnings on Wednesday, according to Zacks.