The week started off mixed, with the S&P 500 up 0.17% to 1,557.87 in afternoon trading Monday.

The Dow Jones industrial average was off 0.11% to 14,531.95, while the Nasdaq was up 0.50% to 3,221.98.

The yield on a 10-year Treasury bond fell 0.12% to 1.70%.

The price of gold rose 2.01% to $1,423.30 per ounce.


Irvine-based healthcare software maker Quality Systems Inc. fell about 2% to $17.19, continuing its slump from last week. Quality Systems had a market value of $1.02 billion. The company’s subsidiary, NextGen Healthcare Information Systems LLC, said Monday that T-System Inc. would use its NextGen Practice Management software system for T-System clients.

Anaheim drug maker Questcor Pharmaceuticals Inc. was up about 2% to $28.42, with drugmakers generally down in afternoon trading Monday. Questcor had a recent market value of $1.65 billion.


Newport Beach-based patent licensing company Acacia Research Corp. was up about 4% to $22.32 for a market value of $1.07 billion. The company said its subsidiary, Brandywine Communications Technologies LLC, reached a license and settlement agreement with West Coast Internet Inc.


Huntington Beach-based action sports apparel maker and retailer Quiksilver Inc. rose 3% to $6 for a market value of $1 billion.


Newport Beach-based specialty chemical products maker American Vanguard Corp. was up about 2% to $29.17 for a market value of $831.22 million.