The Nasdaq was up 1.14% to 3,150 in midday trading Thursday, while the Dow Jones Industrial Average rose 0.95% to 13,460.
The S&P 500 was up 1.04% to 1,452.
The yield on a 10-year treasury bond was up 1.25% to 1.79%.
The price of gold rose 1.9% to $1,767 per ounce.
Shares of Irvine-based healthcare software maker Quality Systems Inc. rose about 6% to $19 for a recent market cap of $1 billion.
Aliso Viejo-based drug maker Avanir Pharmaceuticals Inc. was up about 5% to $3. Avanir had a market value of about $467 million.
Shares of Costa Mesa-based Emulex Corp. rose about 5% to $8 for a recent market cap of $695 million.