The S&P 500 was up 0.36% to 1,727.76 in afternoon trading Thursday.
The Dow Jones industrial average was down 0.31% to 15,326.48, while the Nasdaq was up 0.34% to 3,852.52.
The yield on a 10-year Treasury bond was off 2.7% to 2.6%.
The price of gold rose 3.18% to $1,323.10 per ounce.
Newport Beach-based Acacia Research Corp. slipped about 5% to $19.64 for a market value of $981.08 million. The company is set to release results for this third quarter after market close today.
Lake Forest-based Quantum Fuel Systems Technologies Worldwide Inc. was up about 8% to $5.09 for a market value of $76.12 million. The company is up 23.54% so far this week and up 79% so far this year. Quantum Fuel Systems announced $500,000 in purchase orders earlier this month.
Aliso Viejo-based drug maker Avanir Pharmaceuticals Inc. rose about 3% to $4.50 for a market value of $654.61 million. The company is up 55.51% so far this year.