The S&P 500 rose 0.4% in midday trading to 2,852.15.
The Dow Jones Industrial Average increased 0.3% to 25,528.18.
The Nasdaq climbed 0.8% to 7,854.52.
The yield on a 10-year Treasury bond fell 0.6% to 2.94%.
The price of gold fell 0.4% to $1,218.
Willdan Group Inc. (Nasdaq: WLDN) climbed 7.7% to $31.92 and a $283 million market cap. Shares have risen 11% since Aug. 2, when the Anaheim engineering firm reported second-quarter revenue and profit that topped analysts’ estimates, and reaffirmed its 2018 forecast.
El Pollo Loco Holdings Inc. (Nasdaq: LOCO) increased 4% to $11.85 and a $458 million market cap on light volume. On Aug. 2 the Costa Mesa restaurant chain reported that revenue rose in the second quarter, and reaffirmed its 2018 outlook.