The S&P 500 was up 0.2% in midday trading to 2,333.77.
The Dow Jones Industrial Average was up 0.3% to 20,462.64.
The NASDAQ was up 0.2% to 5,777.01.
The yield on a 10-year Treasury bond rose 2.2% to 2.49%.
The price of gold fell 0.1% to $1,228.
Ensign Group Inc. in Mission Viejo was up 3.4% to $17.94 and a $909 million market cap. Shares in the post-acute care facilities operator had declined 15% last week after Ensign missed analyst quarterly expectations.
ChromaDex Corp. in Irvine was up 6.5% to $2.89 and a $110 million market cap. The ingredients maker said it expected preliminary and unaudited quarterly revenue of about $5.6 million and full-year revenue of about $26.8 million, up 29% and 22%, year-over-year. ChromaDex’s quarterly report is expected in mid-March.
El Pollo Loco Holdings Inc. in Costa Mesa was up 2.7% to $13.20 and a $508 million market cap on above-average volume.