The S&P 500 was down 0.5% in midday trading to 2,804.13.

The Dow Jones Industrial Average declined 0.3% to 25,574.13.

The Nasdaq dropped 0.7% to 7,635.61.

The yield on a 10-year Treasury bond fell 1.4% to 2.38%.

The price of gold ticked 0.3% lower to $1,311 an ounce.

The price of oil fell 1.1% to $59.26 a barrel.

HEALTHCARE

San Clemente-based Glaukos Corp. (NYSE: GKOS) was down 4.5% to $76.31 and a $2.8 billion market cap. Shares in the maker of products to treat glaucoma are still up about 40% year-to-date.

REAL ESTATE

William Lyon Homes (NYSE: WLH) in Newport Beach was up 4.5% to $15.85 and a $576 million market cap. The homebuilder’s shares are up more than 30% year-to-date.