The S&P 500 was down 0.3% in midday trading to 2,072.13.
The Dow Jones Industrial Average was down 0.2% to 17,678.86.
The Nasdaq was down 0.4% to 5,089.22.
The yield on a 10-year Treasury bond was down 0.5% to 2.3%.
The price of gold was down 0.7% to $1,060.
Irvine-based Lombard Medical Inc. was down 3% to $1.28 and a $26 million market cap on high volume. The maker of endovascular stent-grafts for repairing aortic aneurysms had by midday traded shares at more than twice its 90-day average.
Costa Mesa-based Nemus Bioscience Inc. was down 18% to 55 cents and an $11 million market cap. The cannabis products company said it was served with a complaint by former Chief Executive John Hollister alleging breach of contract relating to his termination. Nemus believes it has “multiple meritorious claims” in the matter.