CANADA - 2025/04/06: In this photo illustration, the UnitedHealth Group logo is seen displayed on a smartphone screen. (Photo Illustration by Thomas Fuller/SOPA Images/LightRocket via Getty Images)SOPA Images/LightRocket via Getty ImagesUnitedHealth Group stock (NYSE: UNH) is up 16% this month, driven by several positive factors. Last month, Warren Buffett disclosed a $1.6 billion stake in the company. This month, UNH also announced it is on track to meet its Medicare Advantage enrollment targets. These cat ...