The S&P 500 was down 0.3% in midday trading to 2,011.01.
The Dow Jones Industrial Average was down 0.1% to 17,115.26.
The Nasdaq was down 0.4% to 4,820.90.
The yield on a 10-year Treasury bond was down 1.3% to 2.06%.
The price of gold was up 0.1% to $1,165.
Irvine-based EP Global Communications Inc. was up 16% to 6 cents and a $275 million market cap. The medical technology firm said it offered exclusive licenses on ophthalmic technology that it has developed to contact lens maker CooperVision Inc., a unit of Pleasanton, Calif.-based Cooper Cos.
Aliso Viejo-based Smith Micro Software Inc. was up 5% to 88 cents and a $41 million market cap. The software maker offered quarterly guidance that calls for a 2% increase in revenue for the quarter and 6% to 9% for 2015.