The S&P 500 was 0.3% higher in midday trading to 2,526.17.
The Dow Jones Industrial Average rose 0.5% to 22,520.71.
The NASDAQ climbed 0.1% to 6,504.86.
The yield on a 10-year Treasury bond was up 0.5% to 2.34%.
The price of gold declined 0.6% to $1,271.
Costa Mesa-based Veritone (Nasdaq: VERI) jumped 13% to $51.50 and a $767 million market cap. Veritone said today that it signed an expanded, two-year agreement with iHeartMedia Inc., which specializes in radio.
Irvine-based Endologix Inc. (Nasdaq: ELGX) rose 4.7% to $4.67 and a $388 million market cap. Shares of the maker of endovascular stent grafts are still down about 38% since May.