The S&P 500 was down 0.2% in midday trading to 2,095.39.
The Dow Jones Industrial Average was down 0.3% to 17,865.62.
The NASDAQ was up 0.1% to 4,863.88.
The yield on a 10-year Treasury bond was up 0.1% to 1.39%.
The price of gold was down 0.4% to $1,362.
Irvine-based Western Digital Corp. was up 4.8% to $47.64 and a $13.4 billion market cap. The storage products maker raised its guidance for the current quarter.
Irvine-based Endologix Inc. was up 3.6% to $13.62 and a $1.1 billion market cap. BMO Capital upgraded it shares to “outperform” with a price target of $16. Endologix makes medical devices to treat abdominal aortic aneurysms.