The S&P 500 was down 0.1% at midday to 2,107.50.
The Dow Jones Industrial Average was down 0.2% to 17,939.64.
The Nasdaq was down 0.1% to 5,118.45
The yield on a 10-year Treasury bond was up 0.7% to 2.39%.
The price of gold was flat at $1,172.
Irvine-based Sabra Health Care REIT Inc. was down 3.5% to $25.40 and a $1.5 billion market cap. The healthcare facility owner said it expects to receive $149 million from an offering of 5.9 million shares of common stock, for a price of about $25.25. The shares had traded about eight times the 90-day average by midday.
Costa Mesa-based Nemus Bioscience Inc. was down 13.7% to $1.95 and a $32 million market cap on high volume. The cannabis-products maker had seen triple its 90-day average share volume by midday; shares have lost 25% of their value this week.