Check out which companies are making headlines before the bell:
UnitedHealth Group — Just three weeks after downgrading the stock to "neutral," Mizuho upgraded the health insurer back to a "buy" rating following its meeting Tuesday with analysts and investors. Mizuho said it is now convinced that the company is well-insulated from any downside due to political change.
Goldman Sachs — Deutsche Bank upgraded Goldman to "buy" from "hold," saying Goldman will be helped by higher interest rates and stronger economic growth, among other factors.
Splunk — The big data software maker reported adjusted quarterly profit of 12 cents per share, four cents a share above estimates. Revenue came in above forecasts, as well. Its current-quarter revenue guidance is also slightly above Street consensus, and the company boosted its outlook for the full year.