The S&P 500 fell 1.50% to 1,565.02 in afternoon trading Monday.
The Dow Jones industrial average was off 1.17% to 14,691.38, while the Nasdaq was down 1.70% to 3,238.91.
The yield on a 10-year Treasury bond fell 0.81% to 1.71%.
The price of gold plunged 8.51% to $1,373.60 per ounce.
Irvine-based real estate investor Sabra Health Care REIT Inc. was down about 5% to $28.78, with REITs trading generally down on Monday. Sabra had a recent market value of $1.07 billion.
Mission Viejo-based The Ensign Group Inc.’s shares fell about 4% to $34.33 for a market value of $746.23 million.
Irvine-based healthcare software maker Quality Systems Inc. was down about 2.5% to $18.26 for a market value of $1.09 billion.
Homebuilders were generally down on Monday on the latest data from the National Association of Home Builders/Wells Fargo Housing Market Index, which fell for the third month in a row.
Shares of Irvine-based Standard Pacific Corp. fell about 6% to $8.16 for a market value of $2.83 billion.
Irvine-based TRI Pointe Homes Inc. fell about 3% to $18.75 for a market value of $593.07 million.
Newport Beach-based Acacia Research Corp. fell about 4% to $29.13 after the patent licensing company announced a settlement agreement between its subsidiaries and Toshiba Corp. Acacia had a recent market value of $1.43 billion.
Foothill Ranch-based Kaiser Aluminum Corp. fell about 4% to $58.51 for a market value of $1.12 billion. The specialty aluminum products maker’s competitor Noranda Aluminum Holding Corp. of Franklin, Tenn., saw its stock rating lowered by Citigroup to "neutral,” with its shares down about 9% Monday to a market value of $241.15 million.
Seal Beach-based Clean Energy Fuels Corp. was down about 5% to $12.17 for a market value of $1.08 billion. Energy companies were trading generally down on Monday.
Huntington Beach-based action sports apparel maker Quiksilver Inc. fell about 4% to $6.01, after closing down 2.5% on Friday. The company had a recent market value of $1 billion.
Shares of Anaheim-based action-sports retailer Pacific Sunwear of California Inc. fell back about 7% to $2.35, after rising 10% last week after a Piper Jaffray analyst upgraded the company’s stock from “neutral” to “overweight.” Pacific Sunwear had a recent market value of $160.71 million.
Huntington Beach-based restaurant operator BJ's Restaurants Inc. fell about 3% to $32.41 for a market value of $911.14 million. Restaurant operators were generally down Monday.