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The S&P 500 rose 0.3% in midday trading to 2,504.53.
The Dow Jones Industrial Average was up 0.1% to 22,312.44.
The NASDAQ gained 1.1% to 6,448.30.
The yield on a 10-year Treasury bond jumped 3.1% to 2.30%.
The price of gold fell 1.1% to $1,288.
American Vanguard Corp. (NYSE: AVD) in Newport Beach was up 7.4% to $23.15 and a $677 million market cap. The chemicals maker said it would buy OHP Inc. in Mainland, Pa., on undisclosed terms.
Veritone Inc. (NASDAQ: VERI) in Newport Beach was down 20% to $52.60 and a $784 million market cap. Shares in the media and artificial intelligence provider had risen seven-fold in the last five weeks. Share volume at midday was 12 times higher than average.
Acacia Research Corp. (NASDAQ: ACTG) in Newport Beach was down 8% to $4.65 and a $235 million market cap. Acacia, which primarily licenses patents, owns 30% of Veritone. Acacia share volume by midday was six times higher than average.