The S&P 500 was up 0.5% in midday trading to 2,658.11.
The Dow Jones Industrial Average rose 0.8% to 24,448.68.
The Nasdaq climbed 0.3% to 7,064.32.
The yield on a 10-year Treasury bond leapt 1.1% to 2.82%.
The price of gold was down 0.8% to $1,329.
Endologix Inc. (Nasdaq: ELGX) in Irvine was up 3.5% to $4.33 and a $363 million market cap. Shares in the maker of a device to treat abdominal aortic aneurysms are up 8% over the last two trading sessions.
Tilly’s Inc. (NYSE: TLYS) in Irvine was up 5.3% to $11.78 and a $343 million market cap on high volume. The youth fashion retailer had by midday traded shares at a rate double its 90-day average.