Is UnitedHealth Group a Buy After Warren Buffett Enters the Picture?

The Oracle of Omaha just took a $1.6 billion stake in the battered healthcare giant, sending shares soaring 9% after hours. Warren Buffett just made his most significant healthcare investment in 15 years, and the market is taking notice. Berkshire Hathaway (BRK.A 0.40%) (BRK.B 0.37%) revealed a new 5 million share stake in UnitedHealth Group (UNH -0.01%) worth $1.6 billion, according to Thursday's regulatory filing. The insurance giant's stock jumped over 9% in after-hours trading on the news -- a sharp rev ...