The S&P 500 was up 0.7% in midday trading to 1,871.99.
The Dow Jones Industrial Average was up/down 1% to 15,915.90.
The Nasdaq was up 0.4% to 4,489.10.
The yield on a 10-year Treasury bond was up 1.9% to 2.02%.
The price of gold was down 0.7% to $1,098.
Irvine-based Edwards Lifesciences Corp. was up 4.3% to $78.74 and a $17 billion market cap. SunTrust Robinson Humphrey upgraded the heart valve maker’s shares to “buy.” Edwards Tuesday said a planned investigation device exemption Partner III Trial was approved by the U.S. Food & Drug Administration
Irvine-based Western Digital Corp. was down 4.1% to $43.92 and a $10 billion market cap on above average share volume.