The S&P 500 was up 0.3% in midday trading to 2,269.28.
The Dow Jones Industrial Average was up 0.5% to 19,980.12.
The NASDAQ was up 0.5% to 5,483.62.
The yield on a 10-year Treasury bond rose 0.7% to 2.56%.
The price of gold fell 0.8% to $1,134.
Foothill Ranch-based Kaiser Aluminum Corp. was up 2.6% to $80.68 and a $1.4 billion market cap on moderate volume. The company is a metals maker.
Costa Mesa-based TTM Technologies Inc. was up 3% to $14.53 and a $1.5 billion market cap. Shares in the printed circuit board maker have risen five consecutive trading sessions after it was named an Excellent Core Partner by FiberHome Telecommunication Technologies Co., Ltd. in Wuhan, China.
Irvine-based Boot Barn Holdings Inc. was up 7% to $14.22 and a $376.5 million market cap. New York investment bank Jefferies raised its target price to $18 on the company, which runs western apparel retail stores.