The S&P 500 was up 0.2% in midday trading to 2,729.98.
The Dow Jones Industrial Average increased 0.5% to 25,353.37.
The Nasdaq climbed 0.4% to 7,377.81.
The yield on a 10-year Treasury bond fell 0.8% to 2.7%.
The price of gold was flat at $1,319.
The price for a barrel of oil fell 1.5% to $53.76.
Evolus Inc. of Irvine climbed 21% to $24.83 and a $676 million market cap. The shares are now up 50% since Jan. 31. The company on Feb. 1 said it received regulatory approval for its wrinkle treatment Jeuveau, which will compete with Allergan's Botox.
Urovant Sciences Ltd. (Nasdaq: UROV) was down 3.4% to $9.18 and a $278 million market cap. Shares in the Irvine-based clinical-stage biopharma company have fallen 13% since its September. initial public offering, which raised nearly $140 million.
KushCo Holdings Inc. (OTC: KSHB) increased 2.7% to $6.08 and a $534 million market cap. Shares of the Garden Grove-based cannabis products maker are down 16% since hitting a 52-week high of $7.20 on Jan. 11.