The S&P 500 was up 0.8% to 2,058.14 in midday trading.
The Dow Jones Industrial Average was up 1% to 17,839.64 and the Nasdaq was up 0.7% to 4,747.96.
The yield on a 10-year Treasury bond rose 0.61% to 1.81%
The price of gold fell 0.2% to $1,262.60.
Costa Mesa-based TTM Technologies Inc. was up 9.9% to $7.77 and a $647 million market cap. The circuit board maker reported sales of about $391 million, up nearly 7%, and adjusted profits of about $23 million, up about 5%, compared with the same quarter last year.
Irvine-based Boot Barn Holdings Inc. was up 8.7% to $23.56 and a $607 million market cap. The western wear apparel retailer said net sales increased about 13% to about $130 million and net income increased about 40% to $8.8 million in its most recent quarter, compared with a year earlier.