The S&P 500 was down 0.1% in midday trading to 2,812.69.
The Dow Jones Industrial Average declined 0.2% to 25,356.54.
The Nasdaq rose 0.3% to 7,693.18.
The yield on a 10-year Treasury bond bumped 1.0% to 3.00%.
The price of gold fell 0.5% to $1,227.
Quality Systems Inc. (Nasdaq: QSII) in Irvine was up 9% to $21.91 and a $1.4 billion market cap. The software maker for medical and dental practices beat estimates on revenue and net income.
William Lyon Homes (NYSE: WLH) in Newport Beach was down 4% to $20.91 and a $789 million market cap. The developer and builder reported higher quarterly revenue and net income but U.S. numbers of new and existing home sales have declined for several consecutive months.