The S&P 500 was up 0.3% in midday trading to 2,270.39.
The Dow Jones Industrial Average was up 0.1% to 19,962.02.
The NASDAQ was up 0.6% to 5,492.97.
The yield on a 10-year Treasury bond rose 1.1% to 2.57%.
The price of gold rose 0.4% to $1,138.
Endologix Inc. in Irvine was down 19.7% to $5.78 and a $478 million market cap. The maker of medical devices to treat abdominal aortic aneurysms said it’s halting shipments of its AFX Endovascular AAA System to investigate a manufacturing issue.
ChromaDex Corp. in Irvine was up 9% to $3.22 and a $122 million market cap on high volume.