The Nasdaq was down 0.55% to 2,970 in midday trading Friday, while the Dow Jones Industrial Average was off 0.19% to 13,079.
The S&P 500 fell 0.41% to 1,407.
The yield on a 10-year treasury bond was down 4.16% to 1.75%.
The price of gold was up 0.09% to $1,718 per ounce.
Shares of Irvine homebuilder Standard Pacific Corp. were off about 12% to $7, a day after the company reported third-quarter earnings that missed analyst expectations. Standard Pacific had a recent market value of about $2.4 billion.
Huntington Beach-based BJ's Restaurants Inc. plunged about 18% to $31 for a market value of $877 million. The restaurant operator reported third-quarter results Thursday that missed analyst expectations on profit and revenue.
Shares of QLogic Corp. rose about 7% to $10, a day after the Aliso Viejo-based networking-equipment maker reported earnings and revenue in line with Wall Street expectations. QLogic had a market value of about $934 million.
Costa Mesa-based Emulex Corp. rose 6% to $7 for a market value of $609 million. The company returned to the black in its recently ended fiscal first quarter, following a year-earlier loss.
Shares of Irvine medical device maker Endologix Inc. were up 5% to $14 for a market value of $860 million. Endologix beat analyst expectations on third-quarter earnings and revenue. The latter rose 20% from a year earlier.