The S&P 500 was up 0.3% in midday trading to 2,270.29.
The Dow Jones Industrial Average was up 0.4% at 19,807.34.
The NASDAQ was up 0.3% to 5,555.02.
The yield on a 10-year Treasury bond rose 0.9% to 2.48
The price of gold rose 0.4% to $1,206.00.
Irvine-based Western Digital Corp. was up 2.3% to $73.35 and a market cap of $20.9 billion. The memory products maker is rumored to bid on part of Japanese partner Toshiba Corp.’s flash memory business.
Aliso Viejo-based Microsemi Corp. was up 2.4% to $56.47 and a $6.5 billion market cap on moderate volume. The company makes chips for communication, aerospace, defense and data center applications.