The S&P 500 rose 0.06% to 1,764.30 in afternoon trading Thursday.
The Dow Jones Industrial Average was down 0.04% to 15,612.66, while the Nasdaq was up 0.17% to 3,937.21.
The yield on a 10-year Treasury bond rose 1.15% to 2.56%.
The price of gold slipped 1.87% to $1,324.90 per ounce.
Investors sent shares of Costa Mesa-based printed circuit board maker TTM Technologies Inc. down about 10% to $8.82, a day after the company named a new chief executive and reported disappointing results for the third quarter. TTM had a recent market value of $728.78 million.
Irvine-based patient monitoring maker Masimo Corp. fell about 8% to $26.20 for a market value of $1.48 billion. The company reported third-quarter results on Wednesday that beat analyst expectations.
Irvine-based medical device maker Endologix Inc. rose about 5% to $17.94, a day after reporting better-than-expected third-quarter results. Endologix had a recent market value of $1.13 billion
Irvine-based laser maker Newport Corp. was up about 11% to $16.07 for a market value of $628.59 million. Analysts at Needham upgraded the company's stock from "hold" to "buy” following the company’s third-quarter results release on Wednesday. Newport said earlier this month that it was selling its Micro Robotics Systems business for $6 million.
Lake Forest-based Quantum Fuel Systems Technologies Worldwide Inc. shares were down about 19% to $4.44 for a market value of $66.4 million. The company is trading about five times its average and closed down about 27% on Wednesday.