The S&P 500 was down 0.5% in midday trading to 2,099.05.
The Dow Jones Industrial Average was down 0.4% to 17,852.71.
The Nasdaq was down 0.3% to 5,130.09.
The yield on a 10-year Treasury bond was up 0.9% to 2.24%.
The price of gold was down 0.6% to $1,107.
Mission Viejo-based Ensign Group Inc. was up 13.4% to $59 and a $1.3 billion market cap. The healthcare facilities owner yesterday after markets closed reported quarterly adjusted earnings of 60 cents per share, up 57% year-over-year, and increased its 2015 full-year guidance. Ensign also approved a $15 million stock repurchase program, set to take place over the next 12 months.
Irvine-based Newport Corp. was up 3.4% to $15.91 and a $630 million market cap. The laser maker said this morning it earned $7 million on revenue of $148 million in its most recent quarter, results that beat forecasts.
Irvine-based Habit Restaurants Inc. was down 2.8% to $23.95 and a $626 million market cap. The fast-casual burger chain is scheduled to report quarterly results today after markets close.