The Nasdaq was up 0.92% to 3,185 in midday trading Friday, while the Dow Jones Industrial Average rose 0.15% to 13,560.
The S&P 500 was up 0.31% to 1,465.
The yield on a 10-year treasury bond rose 5.87% to 1.86%.
The price of gold was up 0.05% to $1,773 per ounce.
Shares of Aliso Viejo-based chipmaker Microsemi Corp. were up about 5% to $22 for a market value of almost $2 billion.
Irvine medical device maker Endologix Inc. fell almost 6% to $12. Endologix had a market value of about $757 million.
Shares of Irvine-based Impac Mortgage Holdings Inc. were down about 12% to $7 for a market value of about $54 million.