The S&P 500 was up 0.2% in midday trading to 2,166.42.
The Dow Jones Industrial Average was up 0.1% to 18,528.02.
The NASDAQ was up 0.6% to 5,058.83.
The yield on a 10-year Treasury bond was down 0.6% to 1.59%.
The price of gold was up 0.1% to $1,329.
Laguna Hills-based Glaukos Corp. was up 3.6% to $32.59 and a $1.1 billion market cap on moderate volume. The company makes devices to treat glaucoma.
Rancho Santa Margarita-based Liquidmetal Technologies Inc. was down 4.5% to 14 cents and an $81 million market cap on high volume.