Core Insights - UnitedHealth Group's shares experienced a rally last week, marking an end to a period of poor performance [1] - The boost in stock performance was attributed to Warren Buffett's stake in the company, alongside support from other significant investors [1] Company Performance - The recent rally in UnitedHealth Group's stock indicates a potential recovery after a series of underwhelming results [1] - The involvement of high-profile investors like Warren Buffett may enhance investor confidence and attract further interest in the stock [1]