The S&P 500 was down 0.3% in midday trading to 2,207.29.
The Dow Jones Industrial Average was down 0.2% to 19,110.57.
The NASDAQ was down 0.2% to 5,386.30.
The yield on a 10-year Treasury bond was down 2% to 2.33%.
The price of gold was up 0.9% to $1,191.
Newport Beach-based chemicals maker American Vanguard Corp. was up 3.4% to $18.25 and a $534 million market cap. Piper Jaffray upgraded the company's shares to “neutral” with a target price of $17.
Irvine-based Impac Mortgage Holdings Inc. was up 5.5% to $15.75 and a $252 million market cap on moderate volume. Orders to suspend trading shares in Canada of the residential mortgage lender were removed late last week.