The S&P 500 was up 0.4% in midday trading to 2,373.91.
The Dow Jones Industrial Average rose 0.3% to 20,878.23.
The NASDAQ increased 0.3% to 5,871.80.
The yield on a 10-year Treasury bond fell 0.7% to 2.58%.
The price of gold was flat at $1,203.
Acacia Research Corp. in Newport Beach climbed 3.9% to $5.30 and a $267 million cap. Shares have recovered today some ground lost when the patent licensor reported a fourth-quarter loss this week.
Lantronix Inc. in Irvine rose 4.8% to $3.05 and a $53 million market cap. Small-cap researcher SeeThruEquity this week boosted its target price to $5 and shares in the provider of data management products are up 13% this week.