The S&P 500 was up 0.4% in midday trading to 2,439.47.
The Dow Jones Industrial Average climbed 0.4% to 21,321.20.
The NASDAQ rose 0.7% to 6,215.36.
The yield on a 10-year Treasury bond fell 0.3% to 2.21%.
The price of gold was down 0.6% to $1,268.
San Clemente-based Glaukos Corp. (GKOS) rose 4.5% to $40.99 and a $1.41 billion market cap. The company, which makes a stent to treat glaucoma, is still 22% below its 52-week high of $52.49 hit in April.
Mission Viejo-based Auxilio Inc. (AUXO) climbed 6.2% to $5.15 and a $148 million market cap. Shares of the company, which provides document and cybersecurity services to hospitals, have more than doubled this year.