Why UnitedHealth Stock Is Skyrocketing Today (Hint: Warren Buffett)

The Oracle of Omaha is driving UnitedHealth stock higher.Shares of UnitedHealth Group (UNH 12.77%) are jumping on Friday, up 13.8% as of 2:14 p.m. ET. The spike comes as the S&P 500 (^GSPC -0.21%) declined 0.1% and the Nasdaq Composite (^IXIC -0.35%) fell 0.3%.The troubled health insurance giant is finally seeing its stock rebound after months of trouble, thanks to the purchase of 5 million shares by Warren Buffett's Berkshire Hathaway.Berkshire buys UNHBerkshire Hathaway's latest regulatory filing revealed ...