The S&P; 500 was up 0.4% to 3,888.85 in midday trading Friday.

The Dow Jones Industrial Average rose 0.3% to 31,153.68, while the Nasdaq increased 0.5% to 13,851.24.

Crude oil ticked up 1.2% to $56.93.

Gold was up 1.3% to $1,815.

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The yield on a 10-year Treasury rose 1.1% to 1.15%.

Shares of Oncocyte Corp. (NYSE: OCX) were up 10.9% to $5.89 for a market cap of $426 million. The Irvine-based maker of lung cancer tests on Friday priced a public offering of its common stock to about $35 million in net proceeds.

Lake Forest-based implantable lens maker STAAR Surgical Company (Nasdaq: STAA) increased 4.7% to $116.39 for a market cap of $5.4 billion. The company, which was trading Friday on volume lower than its daily average, is up 43% so far this year.