The S&P 500 was down 0.3% in midday trading to 2,346.68.
The Dow Jones Industrial Average was down 0.2% to 20,606.53.
The NASDAQ was down 0.4% to 5,844.73.
The yield on a 10-year Treasury bond fell 0.1% to 2.30%
The price of gold rose 0.1% to $1,276.
Del Taco Restaurants Inc. in Lake Forest was down 2% to $12.24 and a $474 million market cap. Shares were recovering from a 7% decline in early trading that came after a short seller questioned the fast food chain’s financial data.
ChromaDex Corp. in Irvine was down 4% to $2.36 and an $89 million market cap on moderate volume. The company makes ingredients for nutrition products.