The S&P 500 was up 0.1% in midday trading to 2,365.49.
The Dow Jones Industrial Average was flat at 20,861.93.
The NASDAQ was up 0.1% to 5,844.30.
The yield on a 10-year Treasury bond was up 1.2% to 2.58%.
The price of gold fell 0.5% to $1,204.
Western Digital Corp. in Irvine was down 2.8% to $74.30 and a $21.4 billion market cap on above average volume. The company makes data storage products.
El Pollo Loco Holdings Inc. in Costa Mesa was down 2.5% to $11.50 and a $443 million market cap. The fast food chicken chain is scheduled to report fourth quarter and full-year financial results after markets close.
Biolase Inc. in Irvine was down 10% to $1.23 and an $83 million market cap. The dental laser maker yesterday reported a higher net loss and lower quarterly revenue year-over-year.