The S&P 500 was down 0.1% in midday trading to 2,268.41.

The Dow Jones Industrial Average was down 0.1% to 19,954.97.

The NASDAQ was down 0.1% to 5,476.83.

The yield on a 10-year Treasury bond fell 1% to 2.54%.

The price of gold was flat at $1,134.

SERVICES

Acacia Research Corp. in Newport Beach was down 4% to $7.15 and a $357 million market cap. Apple Inc. in Cupertino filed a lawsuit against the patent services company alleging it colluded with Nokia Corp. in “unfair and anticompetitive tactics,” media reports said.

HEALTHCARE

ChromaDex Corp. in Irvine was up 5% to $2.75 and a $104 million market cap on high volume. The company makes ingredients for dietary supplements, food, beverages and cosmetics.