The S&P 500 was down 0.6% in midday trading to 2,034.49.
The Dow Jones Industrial Average was down 0.7% to 17,403.18.
The NASDAQ was down 0.9% to 4,698.78.
The yield on a 10-year Treasury bond was down 1.6% to 1.85%.
The price of gold was down 1.5% to $1,255.
Irvine-based Sabra Health Care REIT Inc. was down 2.7% to $19.41 and a $1.3 billion market cap. Mizuho Securities downgraded the health facility owner to “neutral.”
Irvine-based Boot Barn Holdings Inc. was up 7.9% to $6.15 and a $162 million market cap. The western wear retailer’s shares had traded by midday at a rate three times the company’s 90-day average.