The S&P 500 was down 0.4% in midday trading to 2,087.93.
The Dow Jones Industrial Average was down 0.3% to 17,808.84.
The NASDAQ was down 0.6% to 4,864.87.
The yield on a 10-year Treasury bond was down 1.4% to 1.62%
The price of gold was up 0.8% to $1,286.
Irvine-based ChromaDex Corp. was up 5.6% to $5.67 on high volume. The ingredients maker had by midday traded shares at twice its 90-day average.
Irvine-based First Foundation Inc. was down 3.2% to $21.56 and a $347 million market cap on above-average volume. The company provides banking and wealth management services.