The S&P 500 was down 0.11% to 1,628.96 in midday trading Monday.
The Dow Jones industrial average rose 0.33% to 15,165.14, while the Nasdaq fell 0.66% to 3,433.23.
The yield on a 10-year Treasury bond slipped 2.31% to 2.11%.
The price of gold was up 1.25% to $1,410.40 per ounce.
Irvine-based Standard Pacific Corp. was down about 4% to $8.50 for a market value of $2.95 billion.
Home builders and construction materials companies were generally down Monday.
Irvine-based data analytics provider CoreLogic Inc. slipped about 3% to $25.53 for a market value of $2.44 billion. Zacks downgraded the company’s stock from "neutral" to "underperform."
Tustin-based drug developer Peregrine Pharmaceuticals Inc. was up about 9% to $1.80 on positive results it announced Monday for two studies involving its bavituximab drug. Peregrine had a recent market value of $246.8 million.
Irvine-based professional services firm Resources Connection Inc. was up about 4% to $11.45 for a market value of $467.10 million. Resources Connection said it hired Kevin Deely as senior practice director of the company's Supply Chain Management practice. Staffing companies were generally mixed in afternoon trading.