The S&P 500 was down 0.3% in midday trading to 2,084.49.
The Dow Jones Industrial Average was down 0.3% to 17,944.23.
The NASDAQ was down 0.3% to 4,891.61.
The yield on a 10-year Treasury bond was up 0.7% to 1.90%.
The price of gold was up 0.8% to $1,240.
Irvine-based fast-casual burger chain Habit Restaurants Inc. was down 4% to $16.80 and a $428 million market cap on above-average volume.
Irvine-based stent maker Lombard Medical Inc. was up 10% to $1.85 and a $37 million market cap on above average volume.