The S&P 500 was up 0.5% in midday trading to 2,731.78.
The Dow Jones Industrial Average rose 0.8% to 24,931.82.
The Nasdaq climbed 0.4% to 7,394.15.
The yield on a 10-year Treasury bond was 0.5% higher to 2.89%.
The price of gold was up 0.8% to $1,322.
Alteryx Inc. (NYSE: AYX) in Irvine was up 4% to $38 and a $2.3 billion market cap. Shares in the analytics software maker are up about 10% over the last two trading sessions.
Del Taco Restaurants Inc. (Nasdaq: TACO) in Lake Forest was up 3.3% to $10.90 and a $419 million market cap. The fast food chain said recently it plans to triple the number of restaurants run by a Michigan franchisee.