The S&P 500 was down 0.3% in midday trading to 2,259.20.
The Dow Jones Industrial Average was down 0.2% to 19,910.86.
The NASDAQ was down 0.5% to 5,443.99.
The yield on a 10-year Treasury bond rose 0.2% to 2.55%.
The price of gold fell 0.2% to $1,131.
CalAmp Corp. in Irvine was down 5.9% to $14.81 and a $538 million market cap. The wireless communications maker reported a $1.5 million loss on revenue of $83.4 million for its most recent quarter. The company reported a $3.9 million profit in the same period a year earlier.
Boot Barn Holdings Inc. in Irvine was down 7% to $12.64 and a $334 million market cap on moderate volume. The company operates a chain of western apparel stores.
Autobytel Inc. in Irvine was up 5% to $13.83 and a $151.2 million market cap. Autobytel provides sales leads and marketing services to auto dealers and manufacturers.