The S&P 500 was flat in midday trading at 2,090.00.

The Dow Jones Industrial Average was down 0.1% to 17,826.85.

The NASDAQ was up 0.1% to 4,897.83.

The yield on a 10-year Treasury bond was down 1.8% to 1.84%.

The price of gold was down 0.3% to $1,220.

HEALTHCARE

Irvine-based Endologix Inc. was up 4% to $12.80 and a $1.1 billion market cap on above-average volume after the maker of medical devices for the treatment of abdominal aortic aneurysms reported positive trial data.

RETAIL

Irvine-based Tilly’s Inc. was up 12% to $6.40 and a $182 million market cap on above-average volume after the retailer’s quarterly report showed revenue that exceeded analysts’ expectations.