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S&P 500 rose 0.1% to 3,445.82 in midday trading.
The Dow Jones Industrial Average fell 0.1% to 28,275.67.
The Nasdaq rose 0.1% to 11,524.09.
The yield on a 10-year Treasury bond increased 1.1% to 0.806%.
Oil dropped 4% to $40.05 a barrel.
The price of gold was up 0.7% to $1,928 an ounce.
Irvine-based Montrose Environmental Group Inc. (NYSE: MEG) jumped 9% to $28.95 per share for a market cap of $722 million. Shares in the air quality and environmental services company have climbed 27% since Oct. 12.
Irvine-based Inari Medical Inc. (Nasdaq: NARI) fell 4.9% to $65.22 and a $3.16 billion market cap. Shares of the maker of devices to remove blood clots are still up threefold since their IPO price of $19 in May.