The Nasdaq fell about 1% to 3,049 in midday trading Thursday, while the Dow Jones Industrial Average fell nearly 1% to 13,051.
The S&P 500 fell about 1% to 1,404.
The yield on a 10-year treasury bond was down nearly 3% to about 2%.
The price of gold rose 2% to $1,672.
Shares of Irvine healthcare technology company Quality Systems Inc. fell about 4% to $17 to a market value of about $1 billion. Quality said Wednesday NextGen Healthcare President Scott Decker plans to leave his post next month. NextGen is a Quality Systems subsidiary. Quality Chief Executive Steven Plochocki will lead NextGen until a new president is named.
Irvine-based action sports retailer Tilly’s Inc. was up about 7% to $18, a day after the company reported better-than-expected results for the July quarter. Tilly’s had a recent market value of $492 million.