The S&P 500 was up 0.1% in midday trading to 2,347.60.

The Dow Jones Industrial Average was down 0.1% to 20,629.92.

The NASDAQ was up 0.4% to 5,837.80.

The yield on a 10-year Treasury bond fell 0.6% to 2.40%.

The price of gold rose 0.1% to $1,249.

TECHNOLOGY

Western Digital Corp. in Irvine was up 2.7% to $78.26 and a $22.6 billion market cap. Shares in the memory products maker traded by midday at double the rate of its 90-day average after sector analysts said “memory demand could continue to outstrip supply throughout the year.”

Alteryx Inc. in Irvine went public today and its shares traded about 11% higher than its initial $14 pricing, to about $15.45 in midday trading, to a market cap estimated at more than $600 million. Alteryx makes analytics software.