The S&P 500 fell 0.03% to 1,836.89 in afternoon trading Thursday.
The Dow Jones Industrial Average was off 0.10% to 16,447.04, while the Nasdaq was down 0.17% to 4,158.60.
The yield on a 10-year Treasury bond slipped 0.37% to 2.98%.
The price of gold rose 0.34% to $1,229.70 per ounce.
Edwards Lifesciences Corp. in Irvine was up about 2% to $67.99 for a market value of $7.44 billion.
Endologix Inc., another Irvine-based medical device maker, rose about 2% to $17.90 for a market value of $1.14 billion. BTIG started coverage of the company this week with a "buy" rating.
Costa Mesa-based networking equipment maker Emulex Corp. was off about 3% to $7.02 for a market value of $643.90 million.