The Nasdaq was up 0.48% to 3,059 in midday trading Monday, while the Dow Jones Industrial Average rose 0.75% to 13,429.
The S&P 500 was up 0.72% to 1,439.
The yield on a 10-year treasury bond rose 0.54% to 1.67%.
The price of gold was off 1.24% to $1,738 per ounce.
Shares of Irvine-based Standard Pacific Corp. were up about 5% to $7 amid an overall increase among homebuilders. Standard Pacific had a recent market cap of $2.5 billion.
Anaheim-based drug maker Questcor Pharmaceuticals Inc. rose about 6% to $23 for a recent market cap of $1 billion.