The S&P 500 was up 0.3% at 3,391.37 during midday trading.
The Dow Jones Industrial Average fell less than 0.1% to 27,820.91.
The Nasdaq gained 0.6% to 11,196.03.
The yield on a 10-year Treasury bond fell 3.2% to 0.661%.
The price of gold increased 0.9% to $2,016.60.
The price for a barrel of oil fell 0.3% to $42.75.
Irvine-based Montrose Environmental Group Inc. (NYSE: MEG) rose 11% to $26.29 per share for a market cap of $548.5 million. Needham yesterday initiated coverage of Montrose with a buy and a $32 price target. Shares in the air quality and environmental services company have risen 75% since its July 23 IPO at $15 a share.
Tilly’s Inc. (Nasdaq: TLYS) fell 6.9% to $5.63 per share for a market cap of $168 million. Shares of the Irvine-based chain of retail stores have tumbled almost 14% over the last month, as retail stores struggle to draw back customers kept away by the COVID-19 pandemic. Tilly’s will release second-quarter financial results on Sept. 3.