Markets declined sharply in midday trading following the United Kingdom’s vote to leave the European Union.

The S&P 500 was down 3% to 2,051.37. The Dow Jones Industrial Average was down 2.7% to 17,519.67. The NASDAQ was down 3.7% to 4,731.37.

The yield on a 10-year Treasury bond was down 9% to 1.58%.

The price of gold was up 4.4% to $1,319.

RESTAURANTS

Huntington Beach-based BJ’s Restaurants Inc. was down 1% to $45.50 and a $1.1 billion market cap. The casual dining restaurant chain fell just slightly in a sharply declining market as Tigress Financial analysts upgraded BJ’s shares to “buy.”

HEALTHCARE

Irvine-based ChromaDex Corp. was down another 7% to $2.93 and a $111 million market cap. Shares in the maker of ingredients for health products fell more than 40% this week after what the company said was an attack from an anonymous source on a stock market discussion site. Chief Executive Frank Jaksch said ChromaDex is “exploring its options in response.”