The S&P 500 was up 0.4% in midday trading to 2,471.26.
The Dow Jones Industrial Average was up 0.2% to 21,616.04.
The NASDAQ was up 0.7% to 6,385.43.
The yield on a 10-year Treasury bond was up 0.1% to 2.27%.
The price of gold was flat at $1,242.
Edwards Lifesciences Corp. (NYSE: EW) in Irvine was up 2.4% to $119.33 and a $25 billion market cap. The heart valve maker is scheduled to report results on Aug. 26.
TTM Technologies Inc. (NASDAQ: TTMI) in Costa Mesa was up 4.5% to $19.50 and a $2 billion market cap on above-average volume. The company makes printed circuit boards.
Acacia Research Corp. (NASDAQ: ACTG) in Newport Beach was up 3.8% to $4.15 and a $210 million market cap. The patent licensing firm is scheduled to report results Aug. 27.