The S&P 500 fell 0.56% to 1,820.30 in afternoon trading Tuesday.
The Dow Jones Industrial Average was down 0.42% to 16,105.19, while the Nasdaq was down 1.62% to 3,957.28.
The yield on a 10-year Treasury bond slipped 1.36% to 2.60%.
The price of gold fell 1.82% to $1,303.40 per ounce.
Irvine healthcare software maker Quality Systems Inc. was off about 3% to $15.58 for a market value of $937.77 million. Raymond James Financial Inc. initiated coverage on the company with a "market perform" rating. Meanwhile, KeyCorp kept its "underweight" rating on the company's stock in a report issued Monday.
Costa Mesa printed circuit board maker TTM Technologies Inc. was up about 7% to $8.17 for a market value of $675.41 million. Stifel Nicolaus upgraded its rating on the company's stock from "hold" to "buy."