The S&P 500 was down 0.4% in midday trading to 2,041.96.
The Dow Jones Industrial Average was down 0.2% to 17,555.28.
The NASDAQ was down 0.8% to 4,784.95.
The yield on a 10-year Treasury bond was down 2% to 1.89%.
The price of gold was down 2.2% to $1,221.60.
Lake Forest-based Quantum Fuel Systems Technologies Worldwide Inc. was down 61% to 15 cents and a $4 million market cap. The natural gas fuel tanks maker filed for Chapter 11 bankruptcy this morning.
Anaheim-based Bridgford Foods Corp. was up 3% to $12.75 and a $116 million market cap on high volume. The thinly traded food maker had by midday traded shares at about four times its 90-day average and its shares are up 50% over the last three weeks.